- Models
- Cyclone 977C9HD1, Cyclone 977C9HD2, Cyclone 977C9HD3
- Data sheet
- TCDSE-243
- 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 | 18 KB | 34f14120…5692836 | FAA DRS (API key needed) |
On this page
The airworthiness directive
60-04-07 WRIGHT: Amdt. 106 Part 507 Federal Register February 20, 1960. Applies to All 977C9HD1, 2 and 3 Engine Models Installed in Helicopters.
Compliance required at first engine overhaul after March 15, 1960, but not later than October 31, 1960.
To alleviate failures of the master rod assemblies, strengthened master and articulating rods with associated parts must be installed in accordance with the instructions contained in Wright Aeronautical Division Service Bulletin No. C9-353.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.