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Form 337 for Field     Approvals
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Data Depot Home > Form 337 Field Aprovals >
FORM 337's for FIELD APPROVALS
Data as of June 1, 2016

If you have any Field Approvals with 337s that you would like to contribute,
especially pre-1955 paperwork and recent approvals, please contact Tom Anderson at:
[email protected].

***** TnT (Tips & Techniques) CATEGORIES *****
1-Wing  |   2-Fuselage  |   3-Cockpit  |   4-Controls  |   5-Fuel System
6-Chassis (Landing Gear)  |   7-Brakes  |   8-Electrical Systems
9-Power Plant (Engine)  |   10-Radio
Use the "Find on this page" feature in your browser to find 337s in a given TnT Category. In Internet Explorer and Chrome the "Find" search box can be accessed by Ctrl+F; on Apple devices use ⌘+F (Command+F); then enter the TnT Category NAME (ie, 'Fuel' or 'Brakes' or 'Wing', etc.) to highlight all the 337 Field Approvals in that category.

Click on a link in the first column to view a pdf of the 337 in another window. <
337Aircraft TypeTnT CategorySubjectDate
15_ELEC_SYSPA-158 - ElectricalSheet 2 of 337 showing electrical system installation??
15_ENG_CNGPA-159 - Power PlantClarify and separate installation of C-85 engine 2010
15_ENG_CNG2PA-159 - Power PlantInstallation of Continental C-85-12 engine1954
15_FUEL_SYSPA-155 - Fuel systemRemoval of header tank and Installation of wing tanks2010
15_FUEL_SYS2PA-155 - Fuel systemInstall non-header fuel system2010
15_FUEL_SYS3PA-155 - Fuel systemInstall dual 12 gal wing tanks2010
16_WHEL_BRKPA-166&7 - Chassis & BrakesInstallation of 800X6 wheels and brakes1980
17_AUX_FUELPA-175 - Fuel systemInstallation of 6 gal aux tank in left wing1957
17_AUX_FUL2PA-175 - Fuel systemInstallation of 9 gal tank in rt wing and Narco radio1963
17_BAT_BOXPA-177 - ElectricalInstallation of Cessna battery box and battery1992
17_ELECTSYSPA-177 - ElectricalInstallation of electrical system1992
17_ENG_CNGPA-179 - Power PlantInstallation of Contenental C-85-8 engine1955
17_ENG_CNG2PA-179 - Power PlantInstallation of Contenental C-85-12-F engine1992
17_LEFT_DOORPA-172&5 - Fuselage & FuelInstall 18 gal tanks in left wing and left hand door1987
17_PARK_BRKPA-177 - BrakesInstallation of parking brake1992
17_PROP_CHGPA-179 - Power PlantChanged McCauley prop model1992
17_SEATBELTPA-173 - CockpitInstalled seatbelts and shoulder harness1992
17_STRUT_FORKPA-171 - WingInstallation of larger wing strut forks1992
17_TAIL_NAVPA-174 - ControlsInstallation of tail nav light1992
17_VENTURIPA-173 - CockpitInstallation of 8" venturi1992
18_START_SKYTKPA-189 - Power PlantInstalled Sky Tech starter1991
20_AIL_GAPPA-201 - WingInstallation of aileron gap seals1992
20_INST_LITEPA-208 - ElectricalPanel mounted Instrument lights 1991
20_WHEEL_BRAKEPA-207 - BrakesInstallation of 6" Cleveland wheels and disk brakes1974
22_AIL_HORNPA-224 - ControlsFiberglass fairings for aileron horns1996
22_ALTERNAT_ALCORPA-228 - ElectricalInstallation of Alcor alternator1974
22_ALTERNAT_B&CPA-228 - ElectricalInstallation of B&C alternator2006
22_ALTERNAT_B&C2PA-228 - ElectricalInstallation of B&C alternator2001
22_ALTERNAT_CHRYPA-228 - ElectricalInstallation of Chrysler alternator1996
22_ALTERNAT_DENSOPA-228 - ElectricalInstallation of Denso alternator2005
22_ALTERNAT_ELEC_SYSPA-228 - ElectricalInstallation of Prestolite alternator & multiple elect changes1987
22_ALTERNAT_PPPA-228 - ElectricalInstallation of Plane Power alternator2007
22_BAG_DOOR_CKPA-222 - FuselageInstallation of gas strut on baggage door1996
22_BATTERYPA-228 - ElectricalInstallation of B&C battery1997
22_BEACONPA-228 - ElectricalInstallation of belly mounted Whelen beacon1996
22_BOOSTPMPPA-225 - Fuel systemInstallation of Bendix electric fuel pump1986
22_BRAKE_CLEVEPA-227 - BrakesInstallation of Cleveland single puck disk brakes 1996
22_BRAKE_PA-28PA-227 - BrakesInstallation of PA-28-140 wheels and brakes1975
22_BRAKE_STINSONPA-227 - BrakesInstallation of Stinson style disk brakes (Univair data)1992
22_BRAKHOSEPA-227 - BrakesInstallation of new flexible brake lines1995
22_CAP-COVRPA-225 - Fuel systemInstallation of modified Cessna 180 fuel caps 1986
22_CONST_SPDPA-229 - Power PlantInstallation of Hartzell constant speed propeller1986
22_COOLERPA-229 - Power PlantInstallation of Harrison oil cooler and flexible oil lines1993
22_COOLER_DOORPA-229 - Power PlantInstallation of cockpit operated oil cooler door2001
22_COOLER2PA-229 - Power PlantInstallation of Harrison oil cooler behind #4 cylinder1987
22_COOLER3PA-229 - Power PlantInstallation of Harrison oil cooler behind #4 cylinder1994
22_COOLER4PA-229 - Power PlantInstall of Stewart Warner oil cooler and remote oil filter1986
22_COURT_LTPA-228 - ElectricalInstalled courtesy lights in wing root1996
22_ELEV_GAPPA-224 - ControlsInstalled elevator gap seals1988
22_ELTPA-2210 - RadiosInstalled EBC ELT1996
22_ENG_CHGPA-229 - Power PlantRemoved O-290D engine and installed O-290-D2 engine1983
22_ENG_CHG2PA-229 - Power PlantConverted engine from 160 hp to 150 hp1965
22_FAIR_TUBPA-222 - FuselageInstalled removable crossmember aft of baggage area1987
22_FAIRNOSEPA-226 - ChassisNose wheel fairing modified to a split fairing1992
22_FLAP_GAPPA-224 - ControlsInstalled flap gap seals1995
22_FLAP_GAP2PA-224 - ControlsInstalled flap gap seals1996
22_FLAP_HNGEPA-224 - ControlsInstalled fiberglass fairings on flap hinges1996
22_FUEL_GAGEPA-225 - Fuel systemInstalled PA-18 type fuel gauges 1994
22_FUEL_LINEPA-225 - Fuel systemModified fuel system to eliminate fuel line under panel2009
22_FUEL_LINE2PA-225 - Fuel systemModified fuel system to eliminate fuel line under panel1997
22_FUEL_TNKPA-225 - Fuel systemInstalled extended range fuel tanks1991
22_FUEL_TNK2PA-225 - Fuel systemInstalled extended range fuel tanks1986
22_HEATED_PITOT_TUBEPA-221 - WingInstallation of Air Services Inc. heated pitot tube1959
22_HEATED_PITOT_TUBE2PA-221 - WingInstallation of DASCO heated pitot tube 1979
22_MULTIPA-2210 - RadiosInstalled Narco radio and transponder and heated pitot1974
22_MULTI2PA-223 - CockpitInstalled new panel, EGT, CHT and rotating beacon1974
22_MULTI3PA-229 - Power PlantInstalled vacuum pump, regulator, gyros, and switches1974
22_PASSDOORPA-222 - FuselageRemoved left hand passanger door1993
22_PROP_TIREPA-226&9 - Chassis & PowerInstalled McCauley prop and 26x10.5x6 tires1995
22_RAMSHORNPA-223 - CockpitInstalled Seneca II Ramshorn control yokes1996
22_REAR_WINPA-222 - FuselageModified rear window to D shaped window1993
22_RUD_AILPA-224 - ControlsDisconnected rudder / aileron interconnect1975
22_SEA_DOORPA-222 - FuselageFabricated right hand seaplane door1991
22_SHOULDERPA-223 - CockpitInstalled shoulder harness restraint system1983
22_SHOULDER2PA-223 - CockpitInstalled shoulder harness restraint system1979
22_SHOULDER3PA-223 - CockpitInstalled shoulder harness restraint system with reels1997
22_SIDE_WINPA-222 - FuselageModified left side window to open like vent window1993
22_SKYLITEPA-222 - FuselageFabricated and installed skylight 1993
22_SKYLITE2PA-222 - FuselageFabricated and installed skylight 1995
22_SUN_VISORPA-223 - CockpitInstalled Rosen Products sun visors2001
22_TAIL_WIREPA-224 - ControlsInstalled stainless steel ovel tail brace wires1997
22_TIE_DOWNPA-221 - WingInstalled removable tiedown 1996
22_TIRE_CHGPA-226 - ChassisInstalled 8.50X6 tires1995
22_TOWHITCHPA-222 - FuselageInstalled tow hitch (by Piper)1959
22_TRANSDUCERPA-225 - Fuel systemInstalled Flo Scan transducer and monitor 1998
22_VENT_NACAPA-222 - FuselageInstalled fiberglass NACA style air scoops on boot cowl1996
22_VERN_CABLPA-223 - CockpitInstalled throttle and mixture vernier control cables1997
22_WHEL_BRKPA-226 - ChassisInstalled Cleveland disk brake system1992
22_WINGTIPPA-221 - WingRemoved Demer wing tip and converted to original design1986
22_WINGTIP2PA-221 - WingExtended wing 24" and installed Ferguson wing tips1991
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