- Models
- HRS-1/CH-19, HRS-3/H-19B, S-55, S-55B, S-55C
- Registered aircraft
- 17 matched by model
- Product
- Aircraft · Rotorcraft
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 | 18 KB | c24fcf79…f709bb8 | FAA DRS (API key needed) |
On this page
The airworthiness directive
54-19-02 SIKORSKY: Applies to All Model S-55 Helicopters.
Compliance required before October 1, 1954.
To insure against the loosening of the servo pilot valve locknut and subsequent improper servo operation, safety clips, Sikorsky P/N S-14-40-5194, should be installed and safetied to P/N S14-40-3227-24 lockwasher.
(Sikorsky Service Information Circular 1440-458 covers this same subject.)
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 17
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1952 | 1 |
|---|---|
| 1953 | 1 |
| 1954 | 3 |
| 1955 | 3 |
| 1956 | 2 |
| 1957 | 2 |
| 1959 | 1 |
| 1996 | 1 |
| 1997 | 1 |
2 with no year recorded