# AD 47-47-01: Landing Gear Reinforcement

- Type: Airworthiness directive
- Status: Current
- Products: FS 2003 PA-12
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,242 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/85D78ACE9E4A6E528625698B007639D8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-47-01

## The airworthiness directive

47-47-01 PIPER: (Was Mandatory Note 5 of AD-780-3.) Applies to PA-12 Aircraft Serial Numbers 12-221, 12-236, 12-239, 12-244, 12-250 and Up to 12-3561 and 12-3901 to 12- 3988.

Compliance required prior to January 15, 1948.

Reinforce the upper end of the tie strap on the landing gear with a 4130 steel plate (Piper No. 10028-13). Install over end of strap by edge welding. As further reinforcement, install a trapezoidal gusset plate (Piper No. 10028-14) on each side of this upper strap attachment by forming and edge welding on assembly.

(Piper Service Bulletin No. 97 dated July 10, 1947, 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 1 of 2 models: 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: 1,242 (1,242 by airframe model, 0 by engine model)
- Makers: Piper 1,242

Models with the most aircraft:

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

All 1 models: https://openairdocs.org/ad/47-47-01/models.md
Every aircraft: https://openairdocs.org/ad/47-47-01/aircraft.md

Its text cites no advisory circulars or STCs.

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