# AD 46-37-01: Fuel Strainer Gasket

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-12, PA-12S, J3C-65S and J3C-65 (Army L-4; L-4A; L-4B (Navy NE-1); L-4H; L-4J (Navy NE-2))
- Published: June 17, 1950
- Issued: June 17, 1950
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,274 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6394E6030BD5518A8625698B007637F7.0001
- DRS record last changed: April 3, 2026
- Page: https://openairdocs.org/ad/46-37-01

## The airworthiness directive

46-37-01 PIPER: (Was Mandatory Note 12 of AD-691-02 and Mandatory Note 1 of AD- 780-3.) Applies to J3C-65 and J3C-65S, Serial Numbers 14027 and Up and All PA-12.

Compliance required by November 1, 1946.

To prevent possible failure of the fuel strainer bowl, replace the present thin fuel strainer bowl gasket with a 1/8-inch thick cork and neoprene gasket supplied by Piper. The bowl seat nut should be tightened only finger tight. The bowl should be carefully examined for signs of flaws or cracks and should be replaced if any are found.

(Piper Service Bulletin No. 89 dated July 11, 1946, covers this same subject.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-691](https://openairdocs.org/tcds/A-691): Piper Aircraft Inc.; names 2 of 7 models: J3C-65 (Army L-4; L-4A; L-4B (Navy NE-1); L-4H; L-4J (Navy NE-2)), J3C-65S
- [TCDS A-780](https://openairdocs.org/tcds/A-780): FS 2003 Corp.; names 2 of 2 models: PA-12S, PA-12

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 1,274 (1,274 by airframe model, 0 by engine model)
- Makers: Piper 1,274

Models with the most aircraft:

- [Piper PA-12](https://openairdocs.org/model/piper-pa-12): 1,242 aircraft (airframe model)
- [Piper J3C-65S](https://openairdocs.org/model/piper-j3c-65s): 27 aircraft (airframe model)
- [Piper PA-12S](https://openairdocs.org/model/piper-pa-12s): 5 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/46-37-01/models.md
Every aircraft: https://openairdocs.org/ad/46-37-01/aircraft.md

Its text cites no advisory circulars or STCs.

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