- Effective
- April 13, 1978
- Model
- S-61N
- Data sheet
- TCDS1H15
- Registered aircraft
- 45 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-3147
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 |
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| FAA DRS HTML | 20 KB | 8b76501e…565fa20 | FAA DRS (API key needed) |
On this page
The airworthiness directive
78-05-07 SIKORSKY: Amendment 39-3147. Applies to Model S-61N rotorcraft prior to and including Sikorsky Serial No. 61805.
Compliance required within the next 300 hours time in service after the effective date of this AD, unless already accomplished.
To prevent inadvertent landing gear retraction, modify the main landing gear electrical system in accordance with Sikorsky Service Bulletin 61B55-40 or later FAA approved revision.
The manufacturer's service bulletin identified and described in this directive is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Sikorsky Aircraft, Commercial Customer Service, Stratford, Connecticut 06602. These documents may also be examined at the Office of the Regional Counsel, New England Region, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.
This amendment becomes effective April 13, 1978.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 45
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1962 | 1 |
|---|---|
| 1963 | 2 |
| 1964 | 1 |
| 1966 | 1 |
| 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 |
7 with no year recorded