PA-12 on floats..gross weight

[centmont]

I have read "somewhere" that the gross weight for PA-12 is increased from 1750# to 1838# when the aircraft is legally mounted on floats. Is this true only for PA-12S, or is this increase part of most/all float STC's? Thanks, Ralph

 

[Alex Clark]

According to a-780

The PA-12S, 3PCSM (Normal category only) stuff for float operation was approved on August 11, 1948. A year and a half after the standard PA-12 approval.

It shows 1838 pounds as the legal gross. With an empty CG range of plus 9.5 to 13.3 inches.
Edo 89-2000 floats were included on the original type certificate.

If all the installation is done in accordance with the Type Certificate of STCs, then your plane is a PA-12s at that time. So the weight and balance and flight speed limitations take effect from the PA-12s, section unless superceeded by STC info.

 

[mvivion]

Isn't there also a mod to up the gross to 1935 on floats? Don't know what's involved, but..

MTV

 

[Alex Clark]

Below is a list of aircraft type along with the Supplemetal Type Certificates (STC)'s Crosswinds S.T.O.L. holds for each type of aircraft .

Piper PA-12 & 12s SuperCruiser

0-360 Engines

SA553AL - PIPER PA-12 LANDPLANES, NORMAL CATEGORY ONLY. INSTALLATION OF 0-360-A2A ENGINE, MCCAULEY 1A200/DFA 8245 PROPELLER W/SPINNER. DRAWING D18-2, DOCUMENT INSTALLATION INSTRUCTION SHEET 6-16 AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

SA610AL - PIPER PA-12S NORMAL CATEGORY ONLY. INSTALLATION OF 0-360-A2A ENGINE, MCCAULEY 1A200/DFA 8245 PROPELLER W/SPINNER. DRAWING D18-2 SHEET 1 THRU 18, DOCUMENT INSTALLATION INSTRUCTION SHEET 6-16 AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

0-320 Engines

SA653AL - PIPER PA-12 & 12S NORMAL CATEGORY ONLY. INTALLATION OF 0-320-A2B OR 0-320-E2D ENGINE, SENSENICH 74DM6-0-52 PROPELLER. DRAWING 12-2, SHEETS 4 THRU 7 AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

SA644AL - PIPER PA-12 NORMAL CATEGORY ONLY. INTALLATION OF 0-320-D2A OR 0-320-B2B ENGINE, MCCAULEY 1A175/GM 8246 PROPELLER. DRAWING 12-1 SHEETS 1 THRU 3, PARTS FABRICATED DRAWING 12-2 SHEETS 1 THRU 7 AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

SA656AL - PIPER PA-12 NORMAL CATEGORY ONLY. INTALLATION OF 0-320-A2B OR 0-320-E2D ENGINE, MCCAULEY 1A175/GM 8246 PROPELLER. DRAWING 12-1 SHEETS 1 THRU 3, PARTS FABRICATED DRAWING 12-2 SHEETS 1 THRU 7 AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

Fuselage Modification

SA689AL - PIPER PA-12 & 12S. INCREASE GROSS WEIGHT FROM 1750 TO 1935 POUNDS. DRAWING 1002, SHEET 1-2.


SA669AL - PIPER PA-12 INSTALLATION OF (1) PIPER PA-18 SUPERCUB LANDING GEAR. DRAWING 1000-1 & 1000-2.

SA555AL - PIPER PA-12 INSTALLATION OF WELDED STEEL REAR FLOAT FITTINGS. DRAWING 1-5.

SA517AL - PIPER PA-12 & 12S INSTALLATION OF PLEXIGLASS SKYLIGHT ON TOP OF CABIN. DRAWING 1-5.

SA687AL - PIPER PA-12 INSTALLATION OF LEFT SIDE CABIN DOOR. DRAWING 1001, SHEET 1 THRU 6.

SA646AL - PIPER PA-12 INSTALLATION OF MOTOROLA 32.5 AMP ALTERNATOR, REPORT ALT-1.

STOL KIT

SA493AL - PIPER PA-12 & 12S NORMAL CATEGORY ONLY. INSTALLATION OF LEADING EDGE CUFF. DRAWING 18-1, KIT INSTALLATION INSTRUCTIONS AND AIRPLANE FLIGHT MANUAL SUPPLEMENT.

WING TIPS

SA629AL - PIPER PA-12 & 12S INSTALLATION OF FIBERGLASS WING-TIP ASSEMBLY. DRAWING STAPLED WITH STC (SINGLE SHEET) INSTRUCTION DOCUMENT 7806-12, DRAWING 12-1 & 12-2.





Piper PA-18 SuperCub

0-360 Engines

SA532AL - PIPER PA-18 "150" & PA-18S "150" NORMAL CATEGORY ONLY. INSTALLATION OF AVCO LYCOMING 0-360-A2A ENGINE, MCCAULEY 1A200/DFA 8245 PROPELLER, DRAWING NUMBER 18-2 INSTALLATION INSTRUCTIONS.

0-320 Engines

SA682AL - PIPER PA-18 "150" & PA-18A "150" NORMAL CATEGORY, LAND PLANES ONLY. INSTALLATION OF 0-320-B2B ENGINE, MCCAULEY 1A75/GM8244 PROPELLER, SHEETS 1 & 2 , DESCRIPTIVE INFORMATION #18-3DI, OR DRAWING # 18-3, SHEETS 1 & 2, INSTALLATION INSTRUCTIONS.

Engine Related

SA693AL - PIPER PA-18 "150" & PA-18A "150" NORMAL CATEGORY, LAND PLANES & SKI PLANES ONLY. INSTALLATION OF MCCAULEY A1A175/GM 8244 PROPELLER, INSTALLATION INSTRUCTIONS & FLIGHT MANUAL SUPPLEMENT.

SA694AL - PIPER PA-18 "150" & PA-18A "150" NORMAL CATEGORY, LAND PLANES & SKI PLANES ONLY. INSTALLATION OF HARRISON AP07AU06-03 OIL RADIATOR OR NIAGARA DEVEL & MANING (NDM) OIL RADIATOR, P/N 20002-A DRAWING 18-3, SHEETS 1 & 2, DRAWING 18-4, DRAWING # 18-4DI.

SA648AL - PIPER PA-18 "150" & PA-18A "150". INSTALLATION OF MOTOROLA 32.5 AMP ALTERNATOR, REPORT # ALT-1.

STOL KIT

SA490AL - PIPER PA-18 "150", PA-18A "150", PA-18S "150", PA-18, PA-18S, PA-18 "135", PA-18S "135", PA-18A "135", PA-18 "105" (SPECIAL) & PA-18S "105" (SPECIAL). INSTALLATION OF LEADING EDGE CUFF, DRAWING 18-1 & FLIGHT MANUAL SUPPLEMENT