57-21-01: Rudder Trim Tab Pin
FAA order 57-21-01 is an airworthiness directive published January 23, 1958. The FAA's subject line: Rudder Trim Tab Pin. It names Piper PA-23 Apache and Aztec: about 1,315 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
- Piper Aircraft Inc.
- Models
- PA-23
- On this site
- Piper PA-23 Apache and Aztec 1,315 registered
Dates and paperwork
- Published
- January 23, 1958
- 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 (448 characters)
57-21-01 PIPER: Applies to All Model PA-23 Aircraft.
Compliance required at next regular inspection period but not to exceed 100 hours.
Inspect the attachment of the rudder trim tab control rod to the rudder trim tab. If a flat head pin has been installed it must be replaced by an AN 23-10 clevis bolt and AN 960-10L washer, secured with an AN 320-3 nut and AN 380-2-2 cotter pin.
(Piper Service Bulletin No. 159 covers this subject.)
Related safety bulletins advice on the same designs, not orders
2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM
2017-02-21CE-17-08 · Main Landing Gear Drag Link Bolt
2012-09-17CE-12-44 · Exhaust systems
2008-01-09CE-08-11 · Landing Gear
2005-07-07CE-05-67 ·
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/57-21-01.json · aircraft systems.