51-21-02: Aileron Hinge Brackets
FAA order 51-21-02 is an airworthiness directive. The FAA's subject line: Aileron Hinge Brackets. It names Piper PA-12 Super Cruiser: about 1,247 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
- FS 2003 Corp.
- Models
- PA-12, PA-12S
- On this site
- Piper PA-12 Super Cruiser 1,247 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 (624 characters)
51-21-02 PIPER: Applies to All Model PA-12 Airplanes.
Compliance required not later than October 15, 1951, and each 100 hours of operation thereafter unless reinforcements are installed.
Carefully inspect aileron hinge brackets to false spar attachment fittings, P/N N10931, (3 per wing), for cracks at the bend between the channel and flat portions of the fittings. If cracked fittings are found, add reinforcement bracket P/N 12047. With reinforcement brackets P/N 12047 installed, special inspections may be discontinued.
(Piper Service Bulletin No. 107, dated September 24, 1948, covers this same subject.)
Related safety bulletins advice on the same designs, not orders
2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM
1998-10-21ACE-99-01 ·
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/51-21-02.json · aircraft systems.