Field Approvals - The Non-Rant and Rave Thread

[SJ]

This was in Avweb this morning...

ALASKANS STOP FAA COLD, MODS RULE SUSPENDED...
A loose coalition of Alaska airlines, charter companies and maintenance
firms has gained a temporary exemption from a national policy on
aftermarket aircraft modifications. On Sept. 13, the FAA announced a
new policy regarding field approval for major repairs and non-STC
modifications to aircraft. Previously, field inspectors had wide
latitude in making those approvals. To enforce uniform standards, the
new policy requires all but the simplest modifications to be reviewed by
committees of FAA officials. The new rule also banned all field
approvals on Part 121 (scheduled service) aircraft.

...EXEMPTION "TEMPORARY"...
Earlier this month, as FAA officials began enforcing the rule, Alaskans
got organized. Todd Bureau, a tour company operator out of Hope,
Alaska, said they bombarded their congressmen and pressured the regional
FAA brass and on Thursday the order was lifted in Alaska. FAA officials
agree the "information" they received from Alaskan aviators prompted the
action. "I think it's a good thing for us to respond quickly when there
might be an impact on our customers," said Joette Storm, the FAA's
community relations manager for Alaska. Storm says the exemption for
Alaska is temporary (how temporary, she couldn't say) and that the move
to a national standard for such things is in everyone's interest.
"We're looking for consistency," she said. We'll soon see if she means
consistent like the conditions in Arizona, or those in Alaska.

...FIELD APPROVALS COMMON
Bureau said the only thing consistent about Alaskan operating conditions
is their lack of consistency. Necessity has led to innovation and
inventions that keep the planes flying in amazing circumstances. The
FAA staff in the north became equally adaptive and field approvals
became a matter of course. There were 2300 last year, according to
Storm. Bureau doesn't use his Piper PA20 commercially but may to
commute and became involved in the issue while seeking to put studded
tires on his plane.

NOTE: See AVweb's NewsWire at <http://avweb.com/n/?45a> for the full
text of the FAA's policy.

[FlipFlop]

Go here for the latest from the FAA...

http://www.faa.gov/avr/afs/faa/8300/...5/2_001_00.pdf

Just posted this morning...

[PA12driver]

David,

I read through this memo dated 10/30/02? How much of this is "reworded" and actually changed from previous authorization. Of interest is the reference to previous work approved by FA?? I must say I got lost in the comparitive language, and after reading it twice, I am even more confused??

Still sounds like their ambigous language would lead the FSDO's to ship nearly "every" request to "engineering", --requiring DER submittal? A bunch of mumble jumble saying, we don't want to deal with it at District level, and assume the "responsibility for it"???

Can you give your synopsis?

As was brought forth in Alaska, doesn't this require a "comment period" prior to enacting "new regulations"???

Tim

[FlipFlop]

Tim...

Yes, No & Maybe... How's that for being specific?...

"I read through this memo dated 10/30/02? How much of this is "reworded" and actually changed from previous authorization. Of interest is the reference to previous work approved by FA?? I must say I got lost in the comparitive language, and after reading it twice, I am even more confused??"

I haven't had a chance to read it yet myself, so I can't comment...

"Still sounds like their ambigous language would lead the FSDO's to ship nearly "every" request to "engineering", --requiring DER submittal? A bunch of mumble jumble saying, we don't want to deal with it at District level, and assume the "responsibility for it"???"

You're very intuitive, that's most likely exactly what's going to happen...

"As was brought forth in Alaska, doesn't this require a "comment period" prior to enacting "new regulations"???"

Remember, this isn't a new regulation, which requires a comment period amongst other things, it's only a handbook revision...

Remember also that there is no regulation allowing field approvals, only STCs and the like...

I read the Avweb Alaska information and though it sounds like Alaska FAA is going to continue with status quo, they are referring to the superseded handbook bulletin, a thing of the past...

[PA12driver]

The saga continues!

Thanks for the comment.

Tim

[StewartB]

The word up here is that the change in policy is set-aside for 30 days, at which time there will be "meetings" to determine the how/what/when of rule changes. Whether that means public comment, or industry representative comment, I don't know. I'm not sure anybody really knows. But, for now it's business as usual.
SB

[Steve Pierce]

I hate to say it but Experimental is looking better and better.

Steve

[klm_ak]

There was a public meeting in Anchorage on Nov. 19. The "abatement of Change 15 implementation" was described as being temporary until the language could be rewritten in a clearer manner.

They claim there was only a small amount of concern over this change in the "lower 48". They also said that one of the major reasons that this change was implemented was complaints at Oshkosh that the FSDO's and ACO's were inconsistent in their willingness to do field approvals on different items (not surprising when PMI's all have differing backgrounds). Unfortunately the federal solution was to move everyone to the lowest common denominator and assume that if one PMI is not familiar enough to do a field approval then no PMI should give one out for that change.

Wayne Fry from FAA says they are going to "try" to implement a system where PMI's can share their experience on Field Approvals from one FSDO to another. We need to make sure they get this done!

[PA12driver]

From AOPA Nov 26th

AOPA asks FAA to rescind changes to field approval policy
Nov. 26 ? In a letter to the head of flight standards AOPA has asked FAA to rescind recent changes to its policy regarding approval of routine major aircraft alterations/repairs, better known as field approvals. The policy changes are being interpreted by many FAA inspectors as more limiting than the previous policy, meaning fewer field approvals, and more delays and bureaucratic red tape. That is making the field approval process impractical.

Aircraft owners tell AOPA that flight standards district offices (FSDOs) all over the country are balking at signing-off routine field approvals for things such as wingtip strobes, conversions to alternators from generators, and conversion of drum to disc brakes not already covered by an STC. AOPA has even experienced the problem firsthand with its Waco Sweepstakes aircraft. AOPA?s maintenance shop was denied a field approval to install improved brakes on the 1939 Waco.

FAA issued the new policy on September 13th and publicly stated that the changes were intended to improve field approval service in all parts of the country, it has had the quite opposite effect.

The change was especially problematic in Alaska, where operators rely on important field approvals to modify aircraft to meet the demands of an extreme operating environment.

Thankfully, FAA got the message loud and clear in meetings held there last week and have agreed to rescind the change in Alaska.

?In our letter we ask FAA to also rescind the policy in the ?lower 48? as well,? said AOPA Vice President Melissa K. Bailey. ?The bottom line is that the problems that surfaced in Alaska are being felt nationwide and it is increasingly more difficult for owners to get field approvals.?

General aviation operators nationwide rely on field approvals to safely enhance their operations and safely maintain their aging aircraft. Rescinding the recent policy changes will restore the FAA?s field approval service.


"Lower 48" IA's, AP's, and Pilot/owners need to raise Hell with the FAA on this issue and not "expect" the Alaskan's to handle it! Write, E-mail and or flood the FSDO with calls in "polite opposition" to this SNAFU!

Tim

[cubdrvr]

A revised directive has been issued on field approvals for tundra tires. Looks like approvals will be allowed under Bulletin number HBAW 97-01B (Amended)........reinstated 12/03/02. I am in the process of trying to get my Bushwheels field approved and visited with FSDO this AM.........the ASI that issues the approval must be trained and authorized on tundra tire procedures.

[SJ]

Dave,

Remind him how much tundra there is in SD. That will surely help your cause...

sj

[cubdrvr]

Yeah, well..........I seem to have lost some of my "tundra". Found out that Corp ground is off limits for aircraft ops.

[FlipFlop]

Want to do a field approval?... This is the latest, greatest, Inspector guidance... I deleted a flow chart as it didn't format properly...

Go to the end for "Figure 1-3. Major Alterations Job Aid" to see what an Inspector is allowed to field approve...

And yes Diggler, I did copy this (saves you from having to make a smart-ass comment)...

Vol. 2 1-1
5/21/03 8300.10 CHG 16
CHAPTER 1. PERFORM FIELD APPROVAL OF MAJOR REPAIRS AND
MAJOR ALTERATIONS
SECTION 1. BACKGROUND
1. PROGRAM TRACKING AND REPORTING
SUBSYSTEM (PTRS) ACTIVITY CODES.
A. Maintenance: 3414, 3416, 3446
B. Avionics: 5414, 5416, 5446
C. JTA: 1.3.19
D. ATOS Elements: 1.2.2
3. OBJECTIVE. This chapter provides guidance in
determining the category of a repair or alteration and
ensuring that the aircraft, engine, or accessory can be
returned to service in accordance with (IAW) the field
approval process, regardless of the rules under which
the aircraft is operated.
5. GENERAL.
A. Definitions:
(1) Acceptable Data. The drawings and
specifications necessary to define the configuration
and design features of the repair or alteration. These
drawings and specifications include information on
weight, balance, operating limitations, flight
characteristics, dimensions, materials, and processes
that are necessary to define the repair or alteration.
The following are examples of acceptable data and
may be used as a basis for developing approved data
to substantiate repairs or alterations:
(a) Manufacturer?s manuals are acceptable
data that may be used as a basis for developing
approved data for major alterations.
(b) Federal Aviation Administration (FAA)
Form 337, Major Repair and Alteration, when the
specified data has been previously approved as a onetime
alteration or repair, is acceptable data that may be
used as a basis for developing approved data for
subsequent alterations.
(c) If it is not FAA-approved, data contained
in a Structural Repair Manual (SRM); Advisory Circular
(AC) 43.13-2, Acceptable Methods, Techniques, and
Practices?Aircraft Alterations, as revised; and
AC 43.13-1B, Acceptable Methods, Techniques, and
Practices?Aircraft Inspection and Repair, as revised.
(The Original Equipment Manufacturer (OEM) SRM is
a preferred manual even though the SRM is not FAAapproved.)
(2) Alter. To change or modify.
(3) Approval for Return to Service. The
approval given by an appropriately rated person that
enables an aircraft to be returned to service.
(4) Approved Data. Substantiating and
descriptive technical data, used to make a major repair
or alteration, that is approved by the Administrator. The
following list, although not all-inclusive, contains
sources of approved data:
(a) Type Certificate Data Sheets (TCDS).
(b) Supplemental Type Certificate (STC)
data, provided it specifically applies to the item being
repaired/altered. Such data may be used in whole or
part as included within the design data associated with
the STC.
(c) Appliance manufacturer?s manuals or
instructions, unless specifically not approved by the
Administrator, are approved for major repairs.
(d) Airworthiness Directives (AD).
(e) FAA Form 337, which has been used to
approve multiple identical aircraft, by the original
modifier.
NOTE: Aviation safety inspectors (ASI) no
longer approve data for use on multiple
aircraft.
(f) U.S. Civil Airworthiness Authority
(CAA) Form 337, dated before 10/1/55.
(g) FAA-approved portions of SRMs.
(h) Designated Engineering Representative
(DER)-approved data, only when approval is
authorized under his/her specific delegation.
8300.10 CHG 16 5/21/03
1-2 Vol. 2
(i) Designated Alteration Station (DAS)
FAA-approved data, when the major alteration is
performed specific to the authorization granted.
(j) Data in the form of Appliance Type
Approval issued by the Minister of Transport Canada
for those parts or appliances for which there is no
current Technical Standard Order (TSO) available. The
installation manual provided with the appliance
includes the Transport Canada Civil Aviation (TCCA)
certificate as well as the date of issuance and an
environmental qualification statement (see
paragraph 13).
(k) Repair data issued under Special Federal
Aviation Regulations (SFAR) 36.
(l) Foreign bulletins, for use on U.S.-
certificated foreign aircraft, when approved by the
foreign authority.
(m) Data describing an article or appliance
used in an alteration which is FAA-approved under a
TSO. As such, the conditions and tests required for
TSO approval of an article are minimum performance
standards. The article may be installed only if further
evaluation by the operator (applicant) documents an
acceptable installation which may be approved by the
Administrator.
(n) Data describing a part or appliance used
in an alteration which is FAA-approved under a Parts
Manufacturer Approval (PMA). (An STC may be
required to obtain a PMA as a means of assessing
airworthiness and/or performance of the part.).
NOTE: Installation eligibility for subsequent
installation or reinstallation of such part or
appliance in a Type Certificated (TC) aircraft,
other than the aircraft for which airworthiness
was originally demonstrated, is acceptable,
provided the part or appliance meets its
performance requirements and is
environmentally and operationally compatible
for installation. The operator/applicant must
provide evidence of previously approved
installation by TC, STC, or field approval on
FAA Form 337 that will serve as a basis for
?follow-on? field approval.
(o) Any FAA-approved Service Bulletins
(SB) and letters or similar documents, including DER
approvals.
(p) Foreign bulletins as applied to use on a
U.S.-certificated product made by a foreign
manufacturer located within a country with whom a
Bilateral Agreement (BA) is in place and by letter of
specific authorization issued by the foreign civil air
authority.
(q) Other data approved by the
Administrator.
(r) AC 43.13-1, as revised, for FAAapproved
major repairs on non-pressurized areas of
aircraft only when the user determines that it is:
? Appropriate to the product being
repaired
? Directly applicable to the repair being
made
? Not contrary to the airframe, engine,
propeller, product, or appliance
manufacturer?s data
(5) Field Approval. One of the means used by
the FAA to approve technical data used to accomplish a
major repair or major alteration. It is an approval, by the
Administrator, through an authorized ASI
(airworthiness), of technical data and/or installations
used to accomplish a major repair or major alteration.
Technical data so approved becomes ?technical data
approved by the Administrator.? This type of approval
may be accomplished for one-time approval.
(6) Follow-On Approval. Approval of equipment
of the same make and model on an aircraft using data
from the initial approval. The make and model of the
aircraft may be different if the installation is similar.
(7) Initial Approval. The first approval of
equipment of a given make and model.
( Major/Minor Repair/Alterations. See
Title 14 of the Code of Federal Regulations (14 CFR)
part 1 and part 43, appendix A.
(9) Major/Minor Type Design Changes. See
14 CFR part 21, §§ 21.93 and 21.113.
(10) Meet the Minimum Standards Established
in a TSO. Means that the equipment need not have
TSO approval, but only meet requirements set by the
TSO.
(11) Return to Service. The action of making an
aircraft operational, after an appropriately rated person
grants approval.
(12) Substantiating. To support and verify with
proof or evidence.
5/21/03 8300.10 CHG 16
Vol. 2 1-3
NOTE: For other definitions, see Order 8300.10
volume 1, chapter 1.
B. ASI Qualifications and Responsibilities. The
ASI must be authorized, experienced, and/or trained in
the methods, techniques, and materials involved in the
major repair/major alteration.
(1) The ASI must determine if, by granting a
field approval, the affected product can be expected to
result in safe operation and conform to regulatory
requirements.
(2) If the ASI is not thoroughly familiar with
all aspects of the alteration or repair, or has any doubt
about the expected airworthiness, an airworthiness
determination must not be given. He/she will seek
assistance to the extent necessary to enable him/her to
reach a clear decision before approval or denial is
given.
(3) Flight Standards District Offices (FSDO)
must ensure that the lack of an ASI?s experience or
qualifications does not necessarily stop the approval
process. The lack of ASI qualifications does not mean
the FSDO should deny a field approval and tell the
applicant that they need an STC. The ASI can seek
assistance from another ASI or FSDO, as appropriate.
(4) ASIs occasionally receive requests to
approve alterations or repairs that do not require a field
approval. These requests should be denied. Typically,
these requests fall into one of two categories: minor
alterations or repairs, or alterations or repairs that
already have adequate approved data. Minor
alterations and repairs do not need approved data and,
therefore, should not receive field approvals.
Alterations and repairs that are supported by sufficient
previously approved DER-approved data may not
require further approval. ASIs should review the data
packages for each requested approval to ensure that a
field approval is needed and is appropriate. ASIs who
deny field approval requests to operators for
alterations or repairs that do not need or qualify for
field approvals should explain to the operator the
reason for the denial and if requested, provide the
reason(s) in writing or via e-mail. The operator can
then retain this as part of the aircraft records for future
reference.
C. DER. If the applicant employs an appropriately
authorized DER to provide supporting data for a field
approval, then the ASI should coordinate activities with
both the applicant and the DER. If the data addresses
the entire alteration or repair, and all of the requirements
of part 21 and part 43 are met, there is no requirement
for any further approval by the ASI. The DER may be
limited to technical areas that do not fully cover the
entire project. For specific DER authorization and
limitations, reference FAA Order 8110.37, Designated
Engineering Representative Guidance Handbook, FAA
Order 8110.45, Use of Data Approved by Designated
Engineering Representatives to Support Major
Alterations, and AC 183.29-1, Designated Engineering
Representatives Directory, as revised. The FAA must
evaluate any area not covered by this approval.
D. DER Data. FAA Orders 8110.37 and 8110.45
address field approvals by reinforcing that although
DERs are not authorized to approve alterations/repairs
via a block 3 entry in FAA Form 337, DER data may
still be used as the basis for an alteration in support of
FAA Form 337. It also recommends inclusion of a note
in the body of FAA Form 8110-3, Statement of
Compliance with the Federal Aviation Regulations,
stating, ?This approval is for engineering design data
only and is not an installation approval.? DER data is
not a field approval, but is approved data which, like
other approved data, can be used to perform major
alterations or repairs without further approval.
DER data can also be included in the data package to
support a field approval request.
E. Part 121 Air Carriers. Aircraft operated by
14 CFR part 121 air carriers, although not specifically
prohibited from receiving field approvals, are not
generally eligible for them. Field approvals may be
performed on part 121 aircraft in rare instances for
extenuating circumstances and each request must be
evaluated on a case-by-case basis. If an ASI from a
FSDO/certificate management office (CMO)/
international field office (IFO) believes that a field
approval request is appropriate, the FSDO/CMO/IFO
will obtain concurrence from the Flight Standards
Division regional office prior to performing the
approval.
(1) The Flight Standards Division regional
office will maintain a database of part 121 field
approvals that it concurred or non-concurred with.
This database will contain:
? A unique control number for each
instance
? The date of concurrence or nonconcurrence
? The name of the ASI assigned to field
approve the alteration/repair
8300.10 CHG 16 5/21/03
1-4 Vol. 2
? The FSDO/CMO/IFO?s routing symbol
? An indication of concurrence or nonconcurrence
? The air carrier identifier
? The make/model of the aircraft
? A brief description of the requested
approval
(2) Annually, the Flight Standards Division
regional office will forward a report of the above
information to AFS-300 by October 15.
7. REPLACEMENT AND MODIFICATIONS
PARTS. Parts or appliances developed,
manufactured, and shipped before the dates established
by the policy published in the Federal Register on
February 27, 1995, 60 FR 10480/10482, and installed
or intended for installation in type-certificated aircraft
by TC, STC, or field approval process, may continue
to be considered approved upon removal from the
aircraft in which it was originally approved, for the
purpose of repair or resale including installation in a
different TC?d aircraft. The intent of this paragraph is
to protect the used value of previously installed parts
that were installed and approved through the field
approval process prior to the Federal Register Notice.
9. ALTERATIONS THAT MAY REQUIRE
ENGINEERING EVALUATION, AIRCRAFT
CERTIFICATION OFFICE (ACO) ASSISTANCE,
OR STCS.
A. The list in Figure 1-3, Major Alterations Job
Aid, describes methods of approval for typical major
alterations. This list is not all-inclusive and each
project should be examined on a case-by-case basis. If
an alteration is not identified on the list, it is eligible
for a field approval unless the project is determined to
be beyond the scope of the field approval process.
B. An alternative to the field approval process is the
use of FAA DER-approved data on FAA Form 8110-3
(with data). If all the data supporting compliance with
applicable airworthiness regulations is DER-approved,
then the product can be altered in accordance with
those data. The person(s) signing blocks 6 and 7 of
FAA Form 337, not the DER, is then responsible for
conforming and approving the installation. Refer to
FAA Order 8110.45 for further details.
11. INCOMPLETE AND/OR INCREMENTAL
INSTALLATIONS.
A. Incomplete or incremental installation field
approvals are intended to approve partial-major
alterations on aircraft that will be operated for an
unspecified period of time. Aircraft having an
incomplete equipment installation may be released for
service only if the following have been accomplished:
(1) The alteration data has been FAAapproved;
(2) The incomplete/incremental alteration has
been determined to not affect the safe operation of the
aircraft;
(3) The equipment installed remains deactivated
and has placards affixed to prevent use;
(4) The weight and balance reflects the
incomplete installation; and
(5) The maintenance records, including the
logbooks and Form 337, have been completed and
signed for the work that was actually accomplished.
NOTE: In order to maintain an effective
Airworthiness Certificate, the approval for
return to service must be accomplished by an
authorized person as defined in 14 CFR
part 43, § 43.7.
B. The applicant must conduct a conformity
inspection on the completed alteration. FAA approval
of the incremental installation may provide for use of
installed equipment if it can be determined that such
equipment can be used safely (i.e., may require
placards, Flight Manual Supplements, crew training.)
13. MAJOR REPAIR DESIGN APPROVALS BY
TCCA AND CANADIAN DESIGN APPROVAL
REPRESENTATIVE (DAR) (CANADIAN
EQUIVALENT TO A U.S. DER). The FAA and
TCCA have agreed in a Memo of Understanding
(MOU) that certain TCCA and TCCA-delegated repair
design approvals are considered to be FAA-approved
data. The following information is provided for
reference, but the MOU should be reviewed if
additional guidance is required. The MOU is available
at http://www.tc.gc.ca/aviation/aircert/internat/mou/
MOU_US.htm.
5/21/03 8300.10 CHG 16
Vol. 2 1-5
A. For U.S.-held TCs, only repair design approvals
issued by TCCA are considered to be approved data.
Repair design approvals issued solely by a TCCA
delegate are not approved data and to be used as such,
require TCCA approval or direct approval by the FAA
or FAA designee.
B. For Canadian-held TCs, repair design approvals
issued by either TCCA or a TCCA delegate are
considered to be approved data.
C. For TCs held by all other countries, TCCA or
TCCA delegated repair design approvals are not
considered to be approved data.
D. TCCA Repair Design Certificate (equivalent to
FAA Form 8110-3) can accompany data and can be
signed by either a TCCA-approved DAR or TCCA
airworthiness authority.
15. FLIGHT TEST/OPERATIONAL CHECK
REQUIREMENTS AND LIMITATIONS.
A. An alteration requiring a part 21, § 21.191(b)
flight test to show compliance with the regulations
must be coordinated with the appropriate engineering
office or flight test DER. An Experimental
Airworthiness Certificate to show compliance must be
authorized by the Manufacturing Inspection District
Office (MIDO) IAW FAA Order 8130.2,
Airworthiness Certification of Aircraft and Related
Products, as revised. If the flight test is unsatisfactory,
the applicant must develop additional data.
B. Alterations requiring a flight manual supplement
or operations limitations changes must be coordinated
with the ACO, unless the Flight Standards inspector
has been specifically authorized by Flight Standards to
sign the document(s).
C. Any alteration or repair that will appreciably
change the aircraft flight characteristics or
substantially affect its operation in flight must be
operationally checked IAW 14 CFR part 91, § 91.407
and the results recorded in the aircraft records.
17. FAA FORM 337, MAJOR REPAIR AND
ALTERATION.
A. Types of Field Approval Data/Alteration
Approvals.
(1) Data/alteration approvals issued for one
aircraft are applicable only to the aircraft described in
block 1 of FAA Form 337. The data/alteration may be
used as acceptable data as a basis for obtaining
approval on other aircraft.
NOTE: ASIs must not approve data for use on
multiple aircraft.
(2) Data based on inspection or testing, such as
approval of technical data by physical inspection (see
section 2, paragraph 5D(3)).
B. Recording Data Deviation. Alterations that use
data that does not differ appreciably from previously
approved data do not require new or additional
approval. Minor deviations that have no bearing on
safety are acceptable without formal approval and
without submission of a formal application by the
applicant. A field approval is not required; however,
the deviation should be recorded on FAA Form 337.
C. Disposition of FAA Form 337. Upon receipt of
a completed FAA Form 337, accomplish the
following:
(1) Review the form to ensure that all
airworthiness requirements are met;
(2) Ensure that all applicable sections,
signatures, and dates are affixed to the form;
(3) Ensure that the office identifier and the
inspector?s initials are entered in the place provided, in
the upper right-hand corner of the form; and
(4) Mail the form to Civil Aviation Registry,
AFS-700, Oklahoma City, OK.
D. Alterations to Fuel Tanks and/or Systems. Within
24 hours of receipt of an FAA Form 337 that describes
a modification to an aircraft fuel system or shows
additional fuel tanks installed in the passenger or
baggage compartment, review and mail as in
paragraph 17C(1) through (4) above.
NOTE: Military aircraft without a civil TC,
foreign-registered aircraft, and component
parts not installed on an aircraft cannot have
FAA Form 337 submitted to AFS-700. This is
because they cannot be identified by aircraft
make, model, serial number, and U.S.
Registration Number.
19. INSTRUCTIONS FOR CONTINUED
AIRWORTHINESS (ICA).
A. The Administrator has determined that the field
approval data package must include ICAs. The
8300.10 CHG 16 5/21/03
1-6 Vol. 2
purpose of the ICA is to provide instructions on how to
maintain aircraft that are altered and appliances that
are installed IAW a field-approved major alteration.
The ICA checklist (Figure 1-1) is a guide for both the
applicant who creates the ICA and the FAA Flight
Standards inspector who accepts the ICA. The ICA
developed IAW this guidance constitutes methods,
techniques, and practices acceptable to the
Administrator. If the ICA for the submitted field
approval major alteration is not acceptable to the FAA
inspector, that inspector should not sign block 3 of the
applicant?s FAA Form 337.
B. The ICA provides the aircraft owner/operator
with the following advantages when included in
block 8 of Form 337:
(1) The major alteration and reference to ICA
is contained in one document;
(2) The ICA becomes a permanent aircraft
record as required by part 91, § 91.417(a)(2)(vi); and
(3) The owner/operator can contact FAA
registry for a replacement FAA Form 337 if the ICA is
lost or destroyed. The additional reference to the
presence of ICA as part of the major alteration in the
aircraft?s maintenance entry will ensure that
maintenance personnel appropriately address ICAs
during future inspections.
C. The applicant is to develop the ICA and present
it in conjunction with the field approval request. The
FAA inspector accepts the ICA if it meets the
applicable requirements in 14 CFR part 23, § 23.1529;
part 25, § 25.1529; part 27, § 27.1529; part 29,
§ 29.1529; part 31, § 31.82; part 33, § 33.4; and
part 35, § 35.4. The checklist in Figure 1-1 is a guide
so the applicant can be assured that all applicable
requirements are met.
D. For field-approved major alterations to aircraft,
engines, and propellers certificated under the Civil Air
Regulations (CAR), the ICA must meet the original
type design requirements. In cases where the major
alteration is a total new design, or a substantial
complete redesign which the CAR did not address, the
major alteration must meet the applicable 14 CFR. The
checklist provides acceptable guidance for these types
of installations.
E. The ICA requirements are the same for a field
approval or STC. The vast majority of field-approved
major alterations are simplistic in design and
execution. Therefore, the applicant?s ICA may not
need as much detail as an ICA required for a
complicated STC. If the manufacturers? instructions
are not available, the applicant may use FAA
publications such as AC 43.13-1 and AC 43.13-2, as
revised; appendix D of part 43, as revised; or other
applicable aviation standards to develop the ICA.
F. Major alterations approved before 10/07/98 were
not required to have ICAs. However, if an owner/
operator wishes to formally incorporate an ICA for
existing field-approved major alterations, they may do
so using the revision process in the checklist?s item
number 16 in Figure 1-1.
5/21/03 8300.10 CHG 16
Vol. 2 1-7
SECTION 2. PROCEDURES
1. PREREQUISITES AND COORDINATION
REQUIREMENTS.
A. Prerequisites:
? Knowledge of the regulatory requirements of
14 CFR parts 21, 43, and 65
? Successful completion of the General/Air
Carrier Airworthiness Safety Inspectors
Indoctrination course, or previous equivalent
FAA training
? Successful completion of the Aircraft
Alterations and Repair Course
? Identification and authorization to perform
field approvals by the FSDO office manager,
and the Regional Flight Standards manager
in the form of a signed statement of
authorization placed in the ASI?s file or in
the office manual (the authorization will state
that the ASI is authorized to perform field
approvals)
B. Coordination. This task may require
coordination or assistance from FAA engineering,
other technical personnel, and the operator. Direct
communication between field personnel to permit a
rapid exchange of technical information is
recommended.
3. REFERENCES, FORMS, AND JOB AIDS.
A. References (current editions):
? 14 CFR parts 1, 21, 23, 25, 27, 29, 31, 33,
34, 35, 36, 39, 43, and 91
? Applicable Special Federal Aviation
Regulations (SFARs)
? FAA Order 8000.50, Repair Station
Production of Replacement or Modification
Parts
? FAA Order 8100.9, DAS, DOA, and
SFAR 36 Authorization Procedures
? FAA Order 8110.37, Designated Engineering
Representative (DER) Guidance Handbook
? FAA Order 8110.45, Use of Data Approved
by Designated Engineering Representatives
to Support Major Alterations
? FAA Order 8130.2, Airworthiness
Certification of Aircraft and Related
Products
? FAA Order 8310.6, Airworthiness
Compliance Check Sheet Handbook
? FAA Order 8340.1, Maintenance Bulletins
? AC 20-114, Manufacturer?s Service
Documents
? AC 23-17, Systems and Equipment Guide for
Certification of Part 23 Airplanes
? AC 33.4-1, Instructions for Continued
Airworthiness
? AC 43-9, Maintenance Records
? AC 43.9-1, Instructions for Completion of
FAA Form 337 (OMB No. 2120-0020),
Major Repair and Alteration (Airframe,
Powerplant, Propeller, or Appliance)
? AC 43.13-1, Acceptable Methods,
Techniques, and Practices?Aircraft
Inspection and Repair
? AC 43.13-2, Acceptable Methods,
Techniques, and Practices?Aircraft
Alterations
? CAR 3, 4a, 4b, 6, 7, and 8
? Bulletin 7A, 7H, and 8
? TCDS
B. Forms:
? FAA Form 337, Major Repair and Alteration
? FAA Form 8110-3, Statement of Compliance
with the Federal Aviation Regulations
? FAA Form 8110-12, Application for Type
Certificate, Production Certificate, or
Supplemental Type Certificate
C. Job Aids:
? FAA Order 8310.6
? Figure 1-1, ICA Checklist
? Figure 1-2, Decision Flow Chart for Field
Approval Process
? Figure 1-3, Major Alterations Job Aid
5. PROCEDURES.
A. Review the Applicant?s Request for a Field
Approval. Ensure that the information supplied is
complete enough and is appropriate to proceed with
the field approval process for the proposed alteration
or repair. The applicant should specify the certification
8300.10 CHG 16 5/21/03
1-8 Vol. 2
rule used as a basis for the field approval (ref. part 21,
§ 21.101.)
(1) Review and evaluate the following before
the operator starts the actual work, as applicable:
(a) A formal request submitted on one of the
following:
? FAA Form 337 completed in duplicate
(in triplicate for extended range fuel
tanks)
? Other administrative forms used by a
manufacturer or operator that are
acceptable to the Administrator, such as
engineering orders
(b) Proposed Flight Manual Supplements.
(c) FAA Form 8110-3.
(d) The description of the proposed
alteration or repair to ensure that it correctly and
accurately describes the alteration or repair.
(e) Methods, sketches, drawings, stress
analyses, photographs, electrical load analyses, etc., to
ensure that the operator has considered all applicable
design standards and has analyses to substantiate the
findings in this regard. The inspector must consider at
least the following:
? The certification basis, including
special conditions (fail safe, damage
tolerance, etc.)
? The structural requirements that may
be affected by the alteration or repair
? Any hazards that may affect the
aircraft or its occupants
? Weight and balance computations
? Operating limitations
? Any other factors affecting safety or
airworthiness
(f) Ensure that all ground and flight tests and
operational checks meet applicable certification
requirements to substantiate the alteration or repair.
(g) Instructions for continued airworthiness.
(2) If data is not complete, the operator must
supply any additional information needed.
B. Evaluate the Proposal. Determine if the
applicant has conducted a conformity evaluation to
ensure that the proposed alteration will not impact the
airworthiness of the aircraft. The applicant will
provide verification that he/she has inspected the
aircraft and reviewed aircraft records to ensure
compatibility of this alteration or repair with
previously approved modifications.
C. Evaluate Data Package.
(1) If a determination is made that the proposed
alteration is beyond the scope of a field approval,
advise the applicant that an STC is necessary.
Assistance to the applicant will include the following:
? Furnish FAA Form 8110-12 application
for an STC
? Advise that supporting data must be
attached
(2) If assistance from an ACO is needed for
approving a major alteration/repair, the ASI, not the
applicant, should make the request for engineering
evaluation/assistance and/or approval of non-approved
engineering data for the field approval. This request
should be made through the Flight Standards regional
office. A memorandum from the ASI?s office to the
ACO through the regional office should accompany
the file. The memorandum should provide pertinent
and detailed information, such as the ASI?s
recommendations and specific requests for advice. The
regional office should forward the request to the ACO.
After the ACO has completed its evaluation, the file
should be returned to the ASI through the regional
office. Coordination with the applicant will include the
following:
(a) Request that the applicant provide all
supporting data.
(b) Caution against proceeding with the
alteration/repair before receiving engineering approval.
(c) Provide the applicant with proposed
schedule for completion of the project that is consistent
with available resources.
(d) Specific Authorization:
? Flight Manual Supplement signature
authority may be authorized by ACs,
bulletins, or other written
documentation
? Interior compliance inspections as
authorized by an ACO
5/21/03 8300.10 CHG 16
Vol. 2 1-9
? Other written authorizations as
requested by the ACO and MIDO
during the coordination process
D. Data Package Accepted for Field Approval.
(1) If engineering assistance was requested,
written ACO concurrence (e.g., memo or e-mail)
becomes an attachment to FAA Form 337.
(2) Approval for Data Only. If the repair or
alteration data complies with regulations, record data
approval by entering the appropriate statement and
signing block 3 of FAA Form 337; return both copies to
the applicant. When recording FAA approval in block 3,
use the following statement for approval of technical
data by examination of the data for use on only one
aircraft:
?The technical data identified herein has
been found to comply with applicable
airworthiness requirements and is hereby
approved for use only on the above
described aircraft, subject to conformity
inspection by a person authorized in
§ 43.7.?
(3) Approval of Technical Data by Physical
Inspection. Schedule a physical inspection with the
applicant to verify workmanship and compliance of
the data submitted. If the repair or alteration complies
with regulations, record alteration approval by entering
the appropriate statement and signing block 3 of FAA
Form 337, and return copies to the applicant. When
recording FAA approval in block 3, use the following
statement:
?The alteration or repair identified herein
complies with the applicable airworthiness
requirements and is approved for use only
on the above described aircraft, subject to
conformity inspection by a person
authorized in § 43.7.?
NOTE: ASIs must not approve data for use on
multiple aircraft.
(4) Denial of Proposed Alteration/Repair. If
the applicant is unwilling or unable to comply with the
requirements to obtain the requested field approval,
terminate the process by notification in writing to the
applicant. This notification should include the reason for
denial. The applicant should be given the opportunity to
make corrections as necessary.
E. Instructions for Continued Airworthiness. ASIs
will ensure that each major alteration that requires
additional maintenance or inspections not covered by
original manufacturer?s instructions approved under the
field approval process will have ICAs prepared IAW
§§ 23.1529, 25.1529, 27.1529, 29.1529, 31.82, 33.4,
or 35.4, as applicable. The ICA will be documented on
FAA Form 337. The ASI will advise the applicant that
the entry for the major alteration in the aircraft?s
maintenance records required by part 43, § 43.9 will
also include a reference to the ICA and identify FAA
Form 337 where the instructions are documented. The
form will be kept in the aircraft?s permanent records
IAW § 91.417(2)(vi). The checklist in Figure 1-1 is a
guide so the applicant can be assured that all applicable
requirements are met.
7. TASK OUTCOMES.
A. File PTRS Data Sheet.
B. Completion of this task can result in the
approval of the data, alteration, or repair, reference to
the ACO for an STC, or denial of a request for a field
approval.
9. FUTURE ACTIVITIES. None.
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5/21/03 8300.10 CHG 16
Vol. 2 1-11
FIGURE 1-1. ICA CHECKLIST
A/C Make: _____________ Model: ____________ S/N: ____________ Reg. # N. _____________
Revision: _____________ Date: ____________ System: _______________
Item Subject
1. Introduction: This section briefly describes the aircraft, engine, propeller, or component that has
been altered. Include any other information on the content, scope, purpose, arrangement, applicability,
definitions, abbreviations, precautions, units of measurement, referenced publications, and distribution
of the ICA as applicable.
2. Description: Of the major alteration, its functions, including an explanation of its interface with
other systems, if any.
3. Control, operation information: Or special procedures, if any.
4. Servicing information: Such as types of fluids used, servicing points, and location of access
panels, as appropriate.
5. Maintenance instructions: Such as recommended inspection/maintenance periods in which each
of the major alteration components are inspected, cleaned, lubricated, adjusted, tested, including
applicable wear tolerances and work recommended at each scheduled maintenance period. This
section can refer to the manufacturers? instructions for the equipment installed where appropriate
(e.g., functional checks, repairs, inspections). It should also include any special notes, cautions, or
warnings, as applicable.
6. Trouble shooting information: Information describing probable malfunctions, how to recognize
those malfunctions, and the remedial actions to be taken.
7. Removal and replacement information: This section describes the order and method of removing
and replacing products, parts, and any necessary precautions. This section should also describe or
refer to manufacturer?s instructions to make required tests, trim checks, alignment, calibrations,
center of gravity changes, lifting or shoring, etc., if any.
8. Diagrams: Of access plates and information, if needed, to gain access for inspection.
9. Special inspection requirements: Such as X-ray, ultrasonic testing, or magnetic particle inspection,
if required.
10. Application of protective treatments: To the affected area after inspection and/or maintenance, if
any.
11. Data: Relative to structural fasteners such as type, torque, and installation requirements, if any.
12. List of special tools: Special tools that are required, if any.
13. For commuter category aircraft: The following additional information must be furnished, as
applicable:
A. Electrical loads.
B. Methods of balancing flight controls.
C. Identification of primary and secondary structures.
D. Special repair methods applicable to the aircraft.
14. Recommended overhaul periods: Are required to be noted on the ICA when an overhaul period
has been set by the manufacturer of a component, or equipment. If there is no overhaul period, the
ICA should state for item 14: ?No additional overhaul time limitations.?
8300.10 CHG 16 5/21/03
1-12 Vol. 2
FIGURE 1-1. (Continued)
Item Subject
15. Airworthiness limitation section: Include any ?approved? airworthiness limitations identified by
the manufacturer or FAA Type Certificate Holding Office (e.g., an STC incorporated in a larger
field approved major alteration may have an airworthiness limitation.) The FAA inspector shall not
establish, alter, or cancel airworthiness limitations without coordinating with the appropriate FAA
Type Certificate Holding Office. If there are no changes to the airworthiness limitations, the ICA
should state for item 15: ?No additional airworthiness limitations? or ?Not Applicable.?
16. Revision: This section should include information on how to revise the ICA. For example, a letter
will be submitted to the local FSDO with a copy of the revised FAA Form 337 and revised ICA.
The FAA inspector accepts the change by signing block 3 and including the following statement:
?The attached revised/new Instructions for Continued Airworthiness (date_____) for the above
aircraft or component major alteration have been accepted by the FAA, superseding the Instructions
for Continued Airworthiness (date_____).? Once the revision has been accepted, a maintenance
record entry will be made, identifying the revision, its location, and date of the Form 337.
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5/21/03 8300.10 CHG 16
Vol. 2 1-15
FIGURE 1-3. MAJOR ALTERATIONS JOB AID
The following lists indicate which method(s) may be used for approving major alterations to TC?d and
STC?d products. These lists are not all-inclusive and each alteration should be evaluated on a case-by-case
basis. Consult each section that concerns your product. Additionally, ASIs should review current bulletins,
ACs, etc., for specific types of installations that have been identified as candidates for field approval. The
legend is as follows:
? Items with the letters ?STC? require an STC.
? Items with the letters ?EVL? may be eligible for approval by means other than an STC,
depending on the scope and complexity of the alteration. These items will not
automatically qualify for a field approval; they require evaluation and review of
guidance to determine if the field approval process may be used.
? Items with the letters ?ENG? may be eligible for approval by means other than an STC,
but require either supporting DER engineering data or concurrence from the ACO for
field approval.
1. GENERAL AVIATION AIRCRAFT.
The following list applies to aircraft certificated under 14 CFR parts 23 and 31 (or the earlier equivalents),
SFAR 41, or Joint Aviation Regulation (JAR) 22.
A. Weight and Balance.
(1) Changes that increase the certificated maximum weight limits (increases in the maximum gross
weight, maximum take-off, or landing weights).
STC
(2) Changes in the certificated center of gravity range limits (for example decreasing the forward
limit or increasing the aft limit).
STC
(3) Changes that increase the operational limits (maximum speed limits, such as VA, VFE, VNE;
minimum speed limitations, such as stall speed; increases in service ceiling, and so forth).
STC
B. Structural Strength.
(1) Changing primary structures (structure that carries flight, ground, or pressure loads as defined in
AC 25.571-1, Damage Tolerance and Fatigue Evaluation of Structure, as amended).
ENG
(2) Substituting airframe primary structural materials. STC
(3) Substituting an engine or propeller (such as replacing a reciprocating engine with a turbine
engine).
STC
(4) Substituting or altering a reciprocating engine such that the net result is an increase of more than
10 percent greater horsepower.
STC
(5) Substituting blind fasteners in primary load structures. ENG
NOTE: All field approvals for blind fasteners, (Cherry Max, or equivalent) in primary load structures
must be coordinated with the ACO or supported by DER-approved data.
(6) Altering passenger-carrying aircraft to an all-cargo or combination configuration. STC
8300.10 CHG 16 5/21/03
1-16 Vol. 2
FIGURE 1-3. (Continued)
C. Reliability.
(1) Changes to manifolding, air induction systems or air intake doors, engine cowling, or baffle that
affect the flow of engine cooling air and carburetor/fire ignition heat rises.
ENG
(2) Changes to the basic engine or propeller design, controls, and operating limitations. ENG
(3) Changes that include engine/propeller adjustments and settings limitations that affect power
output.
ENG
(4) Modifications to approved avionics equipment that affect reliability or airworthiness, such as changes:
? Deviating from the design environment performance. STC
? Deviating from the component manufacturer?s operating limitations. STC
? To software. STC
? To wire shielding that may affect High Intensity Radiated Fields (HIRF) and Electromagnetic
Interference (EMI).
EVL
D. Operational Characteristics.
(1) Changes or relocation of system components (including hydraulic, oil, and fuel systems
components) and equipment that affect structural integrity, flight, ground handling characteristics, or noise/
acoustics of the aircraft.
ENG
(2) Changes that alter the movable control surfaces that affect the dynamic and/or static balance,
alter the aerodynamic contour of movable control surfaces, or change the weight distribution.
STC
(3) Changes in control surface travel, control system mechanical advantage, location of control
system component parts, or direction of motion.
STC
(4) Changes in basic dimensions or external aerodynamic contour/configuration of the aircraft such
as wing and tail planform or incidence angles, canopy, contour or radii, the location of wing and tail
fairings, winglets, wing lift struts, tiptanks, windows, and doors.
STC
(5) Changes in canopies, windows, and doors on unpressurized aircraft. EVL
(6) Changes in engine cowlings. ENG
(7) Changes to flight-critical electrical/electronic systems such as electronic flight controls or the
engine control system, Full Authority Digital Engine Control (FADEC), fly-by-wire, and so forth.
STC
( Changes that affect aircraft performance, affected by changes in drag, engine power, revolutions
per minute (RPM), or exhaust muffler.
EVL
(9) Changes affecting noise. ENG
(10) Changes affecting flight characteristics. ENG
(11) Installation of:
? Avionics systems performing critical functions or involving complex interfaces to other
systems.
STC
? Heads up displays used for primary navigation. STC
? Traffic Alert and Collision Avoidance Systems I (TCAS I). EVL
5/21/03 8300.10 CHG 16
Vol. 2 1-17
FIGURE 1-3. (Continued)
? Traffic Alert and Collision Avoidance Systems II (TCAS II). STC
? Autopilots. STC
? Flight data recorders (FDR). STC
? Ground proximity warning systems (GPWS). STC
? Electronic flight instrument systems (EFIS) (see relevant bulletin(s)). STC
? Terrain Awareness and Warning Systems (TAWS-A). STC
? Terrain Awareness and Warning Systems (TAWS-B). EVL
? Emergency Vision Assurance Systems (EVAS). STC
? Global positioning system (GPS) (see relevant bulletin(s)). EVL
NOTE: ASIs should also review current guidance for specific types of installations that have been
identified as candidates for field approval.
(12) Changes that increase the differential pressure limits of an atmospheric or climatic control
system of aircraft interior compartments.
ENG
(13) Changes in engine and propeller combination (vibration approval). ENG
(14) Any alteration that requires flight testing to show compliance with the regulations (not
applicable to operational flights conducted under § 91.407(b)).
ENG
(15) Anti-terrorism countermeasures, including flares. STC
E. Airworthiness.
(1) Changes to landing gear and related components, such as internal parts of shock struts, length,
geometry of members, brake and brake systems, or additions.
EVL
(2) Changes to systems that affect aircraft airworthiness, such as:
? Relocation of exterior fuel vents, fuel drains, or battery vents. (Applicable to components not
attached to the basic engine.)
EVL
? Crew or passenger liquid oxygen (LOX) or on-board generating systems. ENG
? External critical access doors, Auxiliary Power Unit (APU) ram air, nacelle blowout doors,
fuel drain.
ENG
(3) Changes to oil, hydraulic, pneumatic, and fuel lines, or systems that affect their operation or
installation and flammability requirements, such as:
? New types of hoses and/or hose fittings that may not meet installation requirements, such as
flow rate and flammability requirements.
ENG
? Changes to fuel dump valves. EVL
? New oil/fuel/hydraulic line materials beyond the scope of AC 43.13-1, as revised. EVL
? Change to, or addition of, permanent fuel tanks or fuel system components, including sealants. EVL
8300.10 CHG 16 5/21/03
1-18 Vol. 2
FIGURE 1-3. (Continued)
(4) Changes in fixed fire extinguisher or detector systems that affect the system?s effectiveness or
reliability, such as:
? Relocating discharge nozzles, detector units, or fixed fire extinguisher bottles. ENG
? Using new or different detector components. ENG
? Decreasing the amount or changing the type of extinguishing agents. ENG
(5) Changes that include substituting airframe materials that affect structural integrity, lightning
protection, or flight characteristics.
ENG
(6) Alterations or repairs that include:
? Use of synthetic covering materials. EVL
? New titanium applications. ENG
? Ceramic coatings. ENG
? Use of synthetic coatings. ENG
? Use of new plated coatings. ENG
F. Crashworthiness.
(1) Changes to the aircraft structure, cabin interiors, or equipment relocation. EVL
(2) Changes that affect emergency exits (i.e., emergency medical services, sport parachute
jumping).
ENG
2. ROTORCRAFT.
The following section applies to aircraft with a certification basis of 14 CFR parts 27, 29, or the earlier equivalents.
A. Weight and Balance.
(1) Changes that increase the certificated maximum weight limits affecting structural, performance,
handling qualities, and so forth (for example, increases in the maximum gross weight, maximum take-off
weight, or landing weight).
STC
(2) Changes in the certificated center of gravity range limits (for example, decreasing the forward
limit or increasing the aft limit).
STC
(3) Changes that increase the operational limits; for example, maximum speed limits such as VA,
and VNE; minimum speed limitations, such as VMIN; or increases in service ceiling, and so forth.
STC
B. Structural Strength.
(1) Changing primary structures (structure that carries flight, ground, or pressure loads as defined in
AC 25.571-1) as well as the following additional modifications or structural members:
? Installation of significant structure and/or appliances to the exterior of the aircraft (i.e., FLIRs,
cameras, firefighting, and spray/dusting equipment).
ENG
? Changes to landing gear and related system and structural components, including wheels,
brakes, and tires.
EVL
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FIGURE 1-3. (Continued)
? Internal frame, longeron, or structural members. STC
? Consideration of flutter and vibration for any of the aforementioned changes. STC
(2) Substituting engine, propeller, rotor, or airframe primary structure materials. STC
(3) Substituting blind fasteners in primary load structures. ENG
NOTE: All field approvals for blind fasteners (Cherry Max, or equivalent) in primary load structures
must be coordinated with the ACO or supported by DER-approved data.
(4) Changing the structural panels and load bearing components that could affect service life. STC
(5) Installing Health Usage Monitoring Systems (HUMS). STC
(6) Installing systems that extract power from drive systems, such as air conditioning power drawn
from the tail rotor driveshaft.
STC
C. Reliability.
(1) Changes to manifolding, air induction systems or air intake doors, engine cowling, or baffle that
affect the flow of engine cooling air and carburetor/fire ignition heat rises.
STC
(2) Change to the basic engine, rotor or propeller design, controls, or operating limitations. STC
(3) Changes that include engine/propeller adjustments and setting limitations that affect power
output.
STC
(4) Modifications to approved avionics equipment that affect reliability or airworthiness, such changes as:
? Deviating from the design environment performance. STC
? Deviating from the component manufacturer?s operating limitations. STC
? To software. STC
? To wire shielding that may affect High Intensity Radiated Fields (HIRF) and Electromagnetic
Interference (EMI).
EVL
D. Operational Characteristics.
(1) Changes or relocation of systems (including hydraulic, oil, and fuel systems) and equipment
that affect structural integrity, flight, ground handling characteristics, or noise/acoustics of the aircraft.
STC
(2) Changes that alter the movable control surfaces that affect the dynamic and/or static balance,
alter the aerodynamic contour of movable control surfaces, or the weight distribution.
STC
(3) Changes in control surface travel, control system mechanical advantage, location of control
system components parts, or direction of motion.
STC
(4) Changes in basic dimensions or external aerodynamic contour/configuration of the aircraft such
as wing and tail planform or incidence angles, canopy, cowlings, contour or radii, the location of wing and
tail fairings, winglets, wing lift struts, tiptanks, windows, and doors.
STC
(5) Changes to flight-critical electrical/electronic systems, such as electronic flight controls or
engine control system, FADEC, fly-by-wire, and so forth.
STC
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FIGURE 1-3. (Continued)
(6) Installation of:
? Avionics systems that perform critical functions or involve complex interfaces to other
systems.
STC
? Heads up displays used for primary navigation. STC
? Traffic Alert and Collision Avoidance Systems I (TCAS I). EVL
? Traffic Alert and Collision Avoidance Systems II (TCAS II). STC
? Autopilots. STC
? Flight data recorders (FDR). STC
? Ground proximity warning systems (GPWS). EVL
? Electronic flight instrument systems (EFIS) (see relevant bulletin(s)). EVL
? Terrain Awareness and Warning Systems (TAWS-A). STC
? Terrain Awareness and Warning Systems (TAWS-B). EVL
? Emergency Vision Assurance Systems (EVAS). STC
? GPS (see relevant bulletin(s)). EVL
NOTE: ASIs should also review current guidance for specific types of installations that have been
identified as candidates for field approval.
(7) Changes that affect aircraft performance, affected by changes in drag, engine power, RPM, or
exhaust muffler.
EVL
( Changes affecting noise. ENG
(9) Changes affecting flight characteristics. ENG
(10) Any alteration that requires flight testing to show compliance with the regulations (not
applicable to operational flights conducted under § 91.407(b)).
ENG
(11) Anti-terrorism countermeasures, including flares. STC
E. Airworthiness.
(1) Changes to systems, such as:
? Relocation of exterior fuel vents or battery vents. EVL
? Crew or passenger liquid oxygen (LOX) or on-board generating systems. ENG
? External critical access doors, APU ram air, nacelle blowout doors, and fuel drain. ENG
(2) Changes to oil, hydraulic, pneumatic, and fuel lines, or systems or their components that affect their
operation or installation and flammability requirements, such as:
? New types of hoses and/or hose fittings that may not meet installation requirements, such as
those of flow rate and flammability.
ENG
? Changes to fuel dump valves. EVL
5/21/03 8300.10 CHG 16
Vol. 2 1-21
FIGURE 1-3. (Continued)
? New oil/fuel/hydraulic line materials. EVL
? New fuel tanks or fuel system components, including sealants. EVL
(3) Changes in fixed fire extinguisher or detector systems that affect the system?s effectiveness or
reliability, such as:
? Relocating discharge nozzle, detector units, or fixed fire extinguisher bottles. ENG
? Using new or different detectors. ENG
? Decreasing the amount or changing the type of extinguishing agents. ENG
(4) Changes that include substituting rotor/airframe materials that affect structural integrity,
lightning protection, or flight characteristics.
ENG
(5) Changes that alter dynamic components of rotorcraft, such as loads, vibration, fatigue, damage
tolerance, flaw tolerance, characteristics of main or tail rotor system, transmission system, gearbox, drive
shafts, driveshaft support bearings, and main and tail rotor blades.
STC
(6) Installation of new or modification of existing icing protection systems. ENG
(7) Changes to a critical or life-limited part, including engine/APU rotating parts. STC
( Alteration of passenger-carrying aircraft to an all-cargo or combination configuration. STC
(9) Additional items include:
? Changes that may require a human factors compliance finding, for example, in flight deck
instrumentation and controls.
STC
? Flight deck lighting changes to support night vision goggle use, or any approvals related to
night vision goggles.
STC
? Changing or substituting engine/aircraft instrumentation required by a unique characteristic of
the particular type design.
STC
NOTE: RPM changes of main and tail rotor may affect handling performance characteristics and/or
noise or acoustics.
(10) Alterations or repairs that include:
? Use of synthetic covering materials. EVL
? New titanium applications. ENG
? Ceramic coatings. ENG
? Use of synthetic coatings. ENG
? Use of new plating coatings. ENG
F. Crashworthiness.
(1) Changes to the aircraft structure, cabin interiors, or equipment relocation that affect
crashworthiness and/or emergency evacuation. This includes initial installation or relocation of seats or
litter systems.
STC
8300.10 CHG 16 5/21/03
1-22 Vol. 2
FIGURE 1-3. (Continued)
(2) Changes that affect emergency exits (i.e., emergency medical services, sport parachute
jumping).
ENG
3. TRANSPORT AIRPLANES.
The following list applies to airplanes certificated under 14 CFR part 25 (or the earlier equivalents).
A. Weight and Balance.
(1) Changes that increase the certificated maximum weight limits (maximum gross weight,
maximum take-off or landing weights, and maximum zero fuel weight).
STC
(2) Changes in the certificated center of gravity range limits (for example, decreasing the forward
limit or increasing the aft limit).
STC
(3) Changes that increase the operational limits (e.g., maximum speed limits, such as VA, VFE, VNE,
VMO, and VMO/MMO; minimum speed limitations, such as stall speed; and increases in service ceiling).
STC
B. Structural Strength.
(1) Changes to principal or primary structural elements (principal elements that carry flight, ground,
or pressure loads) defined by AC 25.571-1, as amended.
STC
(2) Substitution of engine, propeller, or airframe primary structure materials. STC
(3) Substitution of blind fasteners in primary load structures. (All field approvals must be
coordinated with the ACO or supported with DER data.)
ENG
(4) Alteration of passenger-carrying aircraft to an all-cargo or combination configuration. STC
C. Reliability.
(1) Significant changes to manifolding, air induction systems or intake doors, engine cowling, or
baffle that affect the flow of engine cooling air.
STC
(2) Changes to the basic engine or propeller design, controls, and operating limitations. STC
(3) Changes that include engine/propeller change to the adjustments and setting limitations. STC
(4) Modifications to approved avionics equipment that affect reliability or airworthiness, such as changes:
? Deviating from the design environmental performance. STC
? Deviating from the component manufacturer?s operating limitations. STC
? To software. STC
? To wire shielding that may affect High Intensity Radiated Fields (HIRF) and Electromagnetic
Interference (EMI).
EVL
D. Operational Characteristics.
(1) Changes or relocation of systems (including hydraulic, oil, and fuel systems) and equipment
that affect structural integrity, flight, and ground handling characteristics of the aircraft.
STC
(2) Significant changes to the movable control surfaces that affect the dynamic and/or static
balance, alter the aerodynamic contour of movable control surfaces, or change the weight distribution.
STC
5/21/03 8300.10 CHG 16
Vol. 2 1-23
FIGURE 1-3. (Continued)
(3) Changes to control surface travel, method of control system mechanical advantage, or direction
of motion.
STC
(4) Changes in basic dimensions or external aerodynamic contour/configuration of the aircraft, such
as wing and tail planform or incidence angles, canopy, cowlings, contour or radii, the location of wing and
tail fairings, winglets, wing lift struts, tiptanks, windows, and doors that would require flight or
performance revalidation.
STC
(5) Installation of new flight critical electrical/electronic systems, electronic flight controls, or
engine control systems such as FADEC and fly-by-wire.
STC
(6) Changes that affect aircraft performance, drag, engine power, RPM, or exhaust muffler. STC
(7) Changes that alter the aerodynamic contour that affect noise or flight characteristics. ENG
( Installation of:
? Avionics systems performing critical functions or involving complex interfaces to other
systems.
STC
? Heads up displays used for primary navigation. STC
? Traffic Alert and Collision Avoidance Systems I (TCAS I). EVL
? Traffic Alert and Collision Avoidance Systems II (TCAS II). STC
? Autopilots. STC
? Flight data recorders (FDR). STC
? Ground proximity warning systems (GPWS). EVL
? Electronic flight instrument systems (EFIS) (see relevant bulletin(s)). EVL
? Terrain Awareness and Warning Systems (TAWS-A). STC
? Terrain Awareness and Warning Systems (TAWS-B). EVL
? Emergency Vision Assurance Systems (EVAS). STC
? GPS (see relevant bulletin(s)). EVL
NOTE: ASIs should also review current guidance for specific types of installations that have been
identified as candidates for field approval.
(9) Any alteration that requires flight testing to show compliance with the regulations (not
applicable to operational flights conducted under § 91.407(b)).
ENG
(10) Anti-terrorism countermeasures, including flares. STC
E. Airworthiness.
(1) Changes to landing gear and related components, such as internal parts of shock struts, length,
geometry of members, brake and brake systems, or additions.
ENG
(2) Changes to systems, such as:
? Relocation of fuel vents or drains. EVL
8300.10 CHG 16 5/21/03
1-24 Vol. 2
FIGURE 1-3. (Continued)
? Crew or passenger liquid oxygen (LOX) or on-board generating systems. ENG
? External critical access doors, APU ram air, nacelle blowout doors, and fuel drain. ENG
(3) Changes to oil, hydraulic, pneumatic, and fuel lines, or systems or their components that affect their
operation or installation and flammability requirements, such as:
? New types of hoses and/or hose fittings that may not meet the installation requirements such
as flow rate and flammability requirements.
ENG
? Changes to fuel dump valves. ENG
? New oil/fuel/hydraulic line materials. ENG
? New flammable fluid tanks or system components. STC
? Change to or addition of permanent fuel tanks or fuel system components, including sealants. ENG
(4) Changes in fixed fire extinguisher or detector systems that affect the system effectiveness or reliability,
such as:
? Relocation of discharge nozzle, detector units, or fixed fire extinguisher bottles. ENG
? Using new or different detector components (including TSO-approved detectors in new or
existing circuit arrangements).
ENG
? Decreasing the amount or changing the type of extinguishing agents. ENG
(5) Changes that include the substitution of airframe materials that affect structural integrity,
lightning protection, or flight characteristics.
ENG
(6) Installation of new systems that affect their operation or installation and flammability requirements,
such as:
? Changing or adding permanent fuel tanks or fuel system components. STC
? Emergency back-up electrical power sources. STC
? Crew or passenger oxygen systems. STC
? Auxiliary Power Unit (APU). STC
? Installing new fire extinguisher or detector systems or changing the type of extinguisher
agents.
STC
(7) Changes to critical or life-limited parts. STC
( Installation of new or modification of existing icing protection system. STC
(9) Changes that alter critical or life-limited parts, including engine/APU rotating parts. STC
(10) Changes that increase the differential pressure limits of an atmospheric or climatic control
system of the aircraft and aircraft interior compartments.
STC
(11) Alterations or repairs that include:
? Use of synthetic covering materials. ENG
? New titanium applications. ENG
5/21/03 8300.10 CHG 16
Vol. 2 1-25
FIGURE 1-3. (Continued)
? Ceramic coatings. ENG
? Use of synthetic coatings. ENG
? Use of new plating coatings. ENG
F. Crashworthiness.
(1) Changes to the aircraft structure, cabin interiors, or equipment relocation that affect
crashworthiness and/or emergency evacuation. This includes initial installation or relocation of seats.
STC
(2) Changes that affect emergency exits (i.e., emergency medical services, sport parachute
jumping).
ENG
4. ENGINES, PROPELLERS, AND APUs.
The following list applies to engines certificated under 14 CFR parts 33, 34, and 36 or JAR E, propellers
certificated under 14 CFR part 35 or JAR P, or APUs approved under TSO-C77a or b.
A. Weight and Balance. Changes that increase or decrease the certificated weight or center of gravity. STC
B. Structural Strength. Changes to an engine, APU, or propeller?s primary or critical structure. STC
C. Reliability and Airworthiness.
(1) Changes to the approved ratings or operational or installation limits. STC
(2) Changes to the engine, propeller, or APU control system. STC
(3) Changes to engine, propeller, or APU adjustments and setting limitations that have an affect on
power output or control functions or operability.
STC
(4) Changes that alter the aerodynamic contour of any blades, vanes, or internal or external
aerodynamic surfaces.
STC
(5) Changes affecting engine or propeller performance, power, or RPM. ENG
(6) Changes to inlet induction or exhaust components. STC
(7) Changes to components, assemblies, or systems, such as:
? Relocation of fuel vents or drains. ENG
? Using new or different alternators, generators, starters, vacuum pumps, or magnetos. EVL
? Using new or different hydraulic components, pumps, or turbo or superchargers. STC
? Pressure fuel lines and oil lines. ENG
? External critical access doors, APU ram air, nacelle blow out doors, bleed ports and doors, and
so forth.
STC
? Installing new or modifying existing icing protection systems. STC
( Changes that include substituting engine/APU/propeller materials that affect structural integrity,
lightning protection, operating characteristics, fire protection, or noise/acoustics.
STC
(9) Major alterations to propellers. STC
(10) Changes to critical or life-limited parts. STC
8300.10 CHG 16 5/21/03
1-26 Vol. 2
FIGURE 1-3. (Continued)
(11) New propeller and engine combinations (vibration approval). STC
(12) Modification to approved electrical equipment, such as:
? Deviating from the design environmental performance compliance requirements. STC
? Deviating from the component manufacturer?s operating limitations. STC
? Changing wire shielding or components that may affect HIRF, EMI, or lightning compliance. STC
? Changing flight-critical electrical/electronic systems, such as electronic controls or engine,
propeller, or APU control systems such as FADEC.
STC
? Changing or substituting engine, propeller, or APU instrumentation. EVL
? Changes that do not conform to the minimum standards in a TSO under which a particular
component or appliance is manufactured.
STC
(13) Changes to or relocation of any systems (including hydraulic, oil, and fuel systems) and
equipment that affect structural integrity, operating characteristics, noise/acoustics, fire protection, or
emissions and fuel venting.
STC
(14) Changes affecting the Airworthiness Limitations Section (i.e., Chapter 4 or 5) of the ICAs. STC
D. Other Considerations.
(1) Changes affecting exhaust emissions (14 CFR part 34). STC
(2) Changes affecting engine noise (14 CFR part 36). STC