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59-12-09: Control Wheel Sprocket Stud

FAA order 59-12-09 is an airworthiness directive in force since June 30, 1959. The FAA's subject line: Control Wheel Sprocket Stud. It names Piper PA-24 Comanche: about 2,428 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: landing gear.

What it applies to as the FAA lists it

Kind of product
Aircraft
Makes
Piper Aircraft Inc.
Models
PA-24, PA-24-250
On this site
Piper PA-24 Comanche 2,428 registered

Dates and paperwork

In force since
June 30, 1959
Published
June 30, 1959 (signed June 24, 1959)
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 (835 characters)
59-12-09 PIPER: Applies to PA-24 and PA-24 "250" Aircraft Serial Numbers 24-1 Through 24-764, 24-766 Through 24-779, 24-781 Through 24-820, 24-822 Through 24-842, 24- 844 Through 24-849, 24-851 Through 24-856, 24-858, 24-860 Through 24-865, 24-867 Through 24-871, 24-875, 24-878, 24-880, 24-881, and 24-885. Compliance required not later than July 30, 1959. Due to a recent inflight incident where control wheel sprocket stud P/N 20913-00 failed, inspect the sprocket stud P/N 20913-00 where the sprocket was attached on all aircraft that have or have had an automatic control system installed and ascertain that the stud is not cracked or twisted and the hole is not elongated. Parts found cracked or damaged are to be replaced before further operation. (Piper Service Bulletin No. 172 covers this inspection in detail.)

Related safety bulletins advice on the same designs, not orders

2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM
2013-05-09NE-13-32 · Propeller Spinner Section
2008-09-17CE-08-50 · Landing Gear Manual Extension System Inspection
2005-07-07CE-05-67 ·
2004-09-15CE-04-88 ·

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/59-12-09.json · aircraft systems.