- Effective
- July 22, 1970
- Models
- S-61A, S-61L, S-61N, S-61R
- Registered aircraft
- 53 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-1026
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 | 20 KB | 717bf26f…bcf3ad2 | FAA DRS (API key needed) |
On this page
The airworthiness directive
70-15-01 SIKORSKY AIRCRAFT: Amdt. 39-1026. Applies to Sikorsky S-61A/L/N/R Type Helicopters Certificated In All Categories and Incorporating Torrington A18702 Series Cabin Heater Blower Assemblies.
Compliance required within the next 25 hours' time of cabin heater operation after the effective date of this AD unless already accomplished.
To prevent potential hazards associated with intermittent operation of the cabin heater blower, accomplish the following:
(a) Comply with the Accomplishment Instructions (excluding paragraph D) of Sikorsky Service Bulletin No. 61B55-14 dated 1 April 1970, or later revision, or equivalent method both approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
(b) Upon request with substantiation data submitted through an FAA maintenance inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This amendment is effective July 22, 1970.
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 53
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 |
8 with no year recorded