- Model
- 47G
- Data sheet
- TCDSH-1
- Registered aircraft
- 60 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 | 20 KB | 55e120eb…d8cc843 | FAA DRS (API key needed) |
On this page
The airworthiness directive
55-25-01 BELL: Applies to Model 47G Helicopters Below Serial Number 1450 Which Have Hydraulic Boost System Installed.
Compliance required as soon as practical but not later than January 15, 1956.
The manufacturer advises that the lateral cyclic bellcrank, P/N 47-725-073-1 attachment bolt P/N AN 174-34 is too short, positioning the threaded area in the forward lateral bellcrank support bracket hole, which may result in the threads flattening out and elongating the support bracket bolt hole.
It is therefore requested that the bolt holes in the bellcrank support bracket be inspected for elongation and the bolt replaced with a longer bolt. If the bolt holes are found elongated beyond permissible tolerance (maximum hole diameter of 0.2520 inch) doubler plates must be added. Redrill and line ream new holes. Replace the AN 174-34 bolt with a new longer bolt P/N AN 174-35, unless doubler plates are added, in which case install AN 174-36 bolts.
(Bell's Mandatory Service Bulletin No. 104, dated November 11, 1955, covers this same subject.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 60
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1947 | 3 |
|---|---|
| 1952 | 5 |
| 1953 | 5 |
| 1954 | 6 |
| 1955 | 3 |
| 1956 | 7 |
| 1957 | 3 |
| 1958 | 1 |
| 1960 | 1 |
| 1963 | 4 |
| 1965 | 2 |
| 1967 | 1 |
| 1969 | 1 |
| 1972 | 1 |
| 1979 | 1 |
16 with no year recorded