hi there -- I have done a search on various discussions and read a lot about overhaulting to the 160. I'm having an overhaul done on my PA-18-150, and am wondering if any of you can simply name a resource or two that my mechanic can consult about getting the STC and exactly what happens. He's concerned about doing the right thing, and said I could save some money on his time by asking you folks about it. I appreciate his attitude and would love some advice. Thanks!
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If you have the wide deck engine it's pretty simple. No field approval require. Change parts according to the Lycoming parts manual. If you have the narrow deck, it's a bit more involved. you have to change cylinders and pistons. you have to install the reinforcement plates listed in the parts book and you have to replace all the cyl. hold down studs and the long through bolt in the middle of the case. All these parts are listed in the Lycoming Parts manual.
I've always wondered about the paragraph in the field approval guidelines that states field approval is required for HP increases greater than 10%. So, theoretically you can indeed make a 150 into a 160 without an approval. How do you document it? My B2B says it's a B2B on the data plate. Can you change a 150hp data plate to signify the change? What about installation in the airplane? Is that covered by the <10% rule? Clearly my 12 didn't list a 160hp 0-320 on the TC. If I had a 150hp installation STC can I bump the HP up by 10% without further approval?
(I have a B2B and a 160hp installation STC. These are not questions specific to my plane.)
SB
A Lycoming SB addresses how to indicate an engine modification.
DATE: November 12, 1999 Service Instruction No. 1304J
(Supersedes Service Instruction No. 1304H)
Engineering Aspects are
FAA Approved
SUBJECT: Engine Nameplate Replacement
MODELS AFFECTED: All Textron Lycoming aircraft engines.
TIME OF COMPLIANCE: Whenever a nameplate is lost or an engine modification affects model
designation.
A replacement nameplate, to replace one that has been lost, will be issued only upon written request when
accompanied by a document from the FAA authorizing a replacement nameplate.
Upon receipt of the FAA letter, your written request, and a check for $125.00, a new nameplate will be
furnished.
Field facilities may not change data contained on an engine data plate; however, they may add a suffix
stamped at the end of the engine serial number to indicate alteration/conversion as follows:
? For all commercial engines in which the basic model has been altered or converted to another model
designation, the letter ?C? added as a suffix on the engine serial number indicates a change from its
original manufacture.
? For all military designated engines rebuilt to commercial standards, the letters ?MC? added as a suffix
on the engine serial number indicates a change from its original manufacture.
It will be the sole responsibility of the altering agent to attach the necessary service parts information
along with FAA Form 337, or its equivalent, to the permanent engine records and/or log book, and attest to
the Federal Aviation Agency as to the airworthiness of the alteration, conversion, or modifications
accomplished. In addition, all provisions of FAR 45.13 must be adhered to.
Replacement nameplates furnished by Textron Lycoming will reflect the configuration of the engine when
it left the factory. Replacement nameplates for altered or converted engines require the addition of a suffix,
as above.
Interesting question Stewartb-- Heres my take on it. the conversion of the A2B to B2B has nothing to do with that guideline. that is for airplanes. The Engine conversion is covered in Service Instructions and can be done using the Parts manual, service bulletins and instructions. And does not need a field approval based on that alone.Originally Posted by stewartb
the reason you need a field approval for a 150 hp to 160 hp increase in the Supercub is because you are now changing octane rating and a supplemental flight manual is required. Which does required a field approval or STC. If your Super Cub was originally certified with a 100 oct engine and you wanted to bump it up 10 HP I don't think you would need a field approval. Course this is just my opinion, Every FAA inspector will have a different one.
BTW did anyone see the article in GAN about this topic. Lycoming guy only referenced STC's as a way to change engine HP. wonder how come he never mentioned you could just change the engine model following lycomings instructions???? New Age CYA????
Had a 150 HP Wide Deck -A2B converted to a 160HP -B2B last spring for a PA-12. Only thing required for the engine to make it different is the 75089 pistons & heavy wrist pins (although we went with 4 new Millennium complete assemblies). Data tag gets a "C" stamped on it ....as you can't change the info on a data plate and all the work and conversion info gets entered into the log book. Therefore the only place you can see that the engine is a 160HP is by reading the logs...as the data plate will still say A2B & 150 HP.
Narrow deck's a much bigger issue. Longer hold down bolts/through bolts/cylinder strap plates/pistons/pins etc.
Believe that an STC is still required to install it to the airframe though!! I dropped the wide deck engine off to the new owners AME (Aircraft Maint Engineer as they are referred to up here) for installation and asked who's STC he was going with. He kinda shrudged his shoulders and I didn't' ask anymore questions..grabbed my bundle of money and ran!
Cheers,
Wayne
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