- Models
- 718C9GB1, Military Cyclone R-1820 Series, Cyclone 702C9GC1, Cyclone 702C9GC2, Cyclone 702C9GC3, Cyclone 702C9GC4 and 26 more
- Data sheets
- TCDSE-219TCDSE-243TCDSTC 192TCDSTC 5E-10
- Product
- Engine
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 61ffa375…c60d235 | FAA DRS (API key needed) |
On this page
The airworthiness directive
51-12-01 WRIGHT: Applies to All Models C9GB, C9GC, C9HD and Military R-1820 Series Engines.
Compliance required as soon as possible, but not later than April 1, 1952.
To preclude piston pin failures, piston pins P/N's 68827, 117691, and 131061, which have not been carburized, must be replaced at each engine overhaul. Piston pins P/N's 117691 and 131061 retain the same part number when carburized, but may be identified by the symbol "C" on the recessed end of the pin. Piston pins P/N 68827 were never carburized and therefore should not be reused. It is suggested that orders for carburized piston pins be placed well in advance of required delivery date.
(Wright Service Bulletin No. C9-156A covers this same subject.)
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.