# AD 56-09-02: Rudder Torque Tube Rivets

- Type: Airworthiness directive
- Status: Current
- Products: Martin-Marietta 202, 202A and 404
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/266AEF394CF5080C86256A3200595E07.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/56-09-02

## The airworthiness directive

56-09-02 MARTIN: Applies to All Models 202, 202A, and 404 Aircraft.

Compliance required by September 1, 1956.

In order to eliminate shearing of rivets securing the rudder torque tube flange, P/N 2021U42196, to the rudder torque tube, P/N 2021D19331, caused by gust buffeting with gust locks not engaged and resulting in loss of adequate and/or positive rudder control, it is necessary to replace the 3/16-inch rivets with 1/4-inch 24ST heat treated rivets.

(Martin Service Instruction Letters No. 202/202A-36 and No. 404-69 cover this same subject.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-795](https://openairdocs.org/tcds/A-795): Martin-Marietta Corporation; names 2 of 2 models: 202A, 202
- [TCDS 1A7](https://openairdocs.org/tcds/1A7): Martin-Marietta Corporation; names 1 of 1 models: 404

## 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: 5 (5 by airframe model, 0 by engine model)
- Makers: Martin 5

Models with the most aircraft:

- [Martin 404](https://openairdocs.org/model/martin-404): 5 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/56-09-02/models.md
Every aircraft: https://openairdocs.org/ad/56-09-02/aircraft.md

Its text cites no advisory circulars or STCs.

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