- Effective
- August 15, 1980
- Models
- S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V
- Registered aircraft
- 54 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-3877
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 | 9f53d5e4…95f7b0d | FAA DRS (API key needed) |
On this page
The airworthiness directive
80-17-07 SIKORSKY AIRCRAFT: Amendment 39-3877. Applies to S-61 series helicopters certificated in all categories, including military counterparts. Compliance required as indicated.
To prevent fatigue failures of the horizontal hinge pins: Replace the Rotary Wing Horizontal Hinge Pin P/N S6110-23020 and S6110-23320 prior to 4000 and 5300 hours time in service, respectively, or within 25 hours time in service after the effective date of this AD, whichever occurs later.
This amendment is effective August 15, 1980.
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 54
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1960 | 1 |
|---|---|
| 1961 | 2 |
| 1962 | 1 |
| 1963 | 4 |
| 1964 | 2 |
| 1966 | 2 |
| 1968 | 3 |
| 1969 | 2 |
| 1970 | 1 |
| 1971 | 2 |
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 4 |
| 1975 | 2 |
| 1976 | 2 |
| 1977 | 6 |
| 1978 | 3 |
| 1979 | 1 |
| 1980 | 4 |
| 1985 | 1 |
9 with no year recorded