- Effective
- March 31, 1977
- Models
- 280C, F-28C, 280C, F-28C
- Data sheet
- TCDSH1CE
- Registered aircraft
- 94 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-2855
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 | c60b4507…1ddc003 | FAA DRS (API key needed) |
On this page
The airworthiness directive
77-06-04 ENSTROM: Amendment 39-2855. Applies to Enstrom Model F28C helicopters with serial numbers 364, 367, 373 and 374 and Model 280C with serial numbers 1007, 1020, 1060, 1062, 1065 certificated in all categories.
Before further flight, unless already accomplished, remove from service the tail rotor assembly P/N 28-150000-3 and replace with an airworthy assembly which has been assembled using forged blade grip fittings P/N 28-150013-11.
The removed tail rotor assembly should be returned to Enstrom Helicopter Corporation, Menominee, Michigan 49858.
This amendment becomes effective March 31, 1977, to all persons except those to whom it was made effective earlier by air mail letter dated March 2, 1977.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 94
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1976 | 13 |
|---|---|
| 1977 | 14 |
| 1978 | 17 |
| 1979 | 4 |
| 1980 | 8 |
| 1981 | 3 |
| 1982 | 1 |
| 1993 | 1 |
33 with no year recorded