56-09-02: Rudder Torque Tube Rivets

FAA order 56-09-02 is an airworthiness directive. The FAA's subject line: Rudder Torque Tube Rivets. It names Martin 404: about 5 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: flight controls.

What it applies to as the FAA lists it

Kind of product: Aircraft
Makes: Martin-Marietta Corporation
Models: 202, 202A, 404
On this site: Martin 404 5 registered

Dates and paperwork

Docket: Unknown
Status: Current
The FAA's document: Read the order on the FAA's site

The order itself the regulatory text, as published

Show the full text (561 characters)

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.)

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/56-09-02.json · aircraft systems.