# AD 51-21-02: Aileron Hinge Brackets

- Type: Airworthiness directive
- Status: Current
- Products: FS 2003 PA-12 and PA-12S
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,247 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D22A8439496D9D3D8625698B007642CE.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/51-21-02

## The airworthiness directive

51-21-02 PIPER: Applies to All Model PA-12 Airplanes.

Compliance required not later than October 15, 1951, and each 100 hours of operation thereafter unless reinforcements are installed.

Carefully inspect aileron hinge brackets to false spar attachment fittings, P/N N10931, (3 per wing), for cracks at the bend between the channel and flat portions of the fittings. If cracked fittings are found, add reinforcement bracket P/N 12047. With reinforcement brackets P/N 12047 installed, special inspections may be discontinued.

(Piper Service Bulletin No. 107, dated September 24, 1948, covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [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: 1,247 (1,247 by airframe model, 0 by engine model)
- Makers: Piper 1,247

Models with the most aircraft:

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

All 2 models: https://openairdocs.org/ad/51-21-02/models.md
Every aircraft: https://openairdocs.org/ad/51-21-02/aircraft.md

Its text cites no advisory circulars or STCs.

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