- Effective
- August 14, 1966
- Models
- S-58A, S-58B, S-58BT, S-58C, S-58D, S-58DT and 17 more
- Registered aircraft
- 76 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-269
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 | a494cfa6…4c226af | FAA DRS (API key needed) |
On this page
The airworthiness directive
66-19-04 SIKORSKY: Amdt. 39-269 Part 39 Federal Register August 4, 1966. Applies to Models S-58 and S-61 Series Helicopters Equipped With Tail Rotor Blades With Serial Numbers Listed in the Appendix of Sikorsky Service Bulletin 58B15-6A, Dated May 18, 1966, or 61B15-5A, Dated May 18, 1966, As Applicable.
Compliance required within the next 50 hours' time in service after the effective date of this AD unless already accomplished.
To prevent operation with tail rotor blades of less than minimum hardness in the flex shank area of the spar, accomplish the following:
(a) Inspect S 1615-30100, S 6115-30001, and S 6117-30001 Series tail rotor blades in the manner set forth in Sikorsky Service Bulletin 58B15-6A or 61B15-5A as applicable.
(b) Before further flight, remove from service blades that do not meet the minimum hardness requirements for the flex shank area of the spar specified in the applicable Service Bulletin.
This directive effective August 14, 1966.
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 76
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1956 | 1 |
|---|---|
| 1957 | 7 |
| 1958 | 4 |
| 1959 | 1 |
| 1960 | 2 |
| 1961 | 2 |
| 1962 | 4 |
| 1963 | 6 |
| 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 |
12 with no year recorded