- Effective
- July 14, 1976
- Models
- 47B, 47B3, 47D, 47D1, 47G, 47G-2, 47H-1
- Data sheet
- TCDSH-1
- Registered aircraft
- 212 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-2636
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 | 21 KB | fc942e12…d00e4f1 | FAA DRS (API key needed) |
On this page
The airworthiness directive
76-12-01 BELL: Amendment 39-2636. Applies to Bell Models 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, and 47H-1 helicopters certificated in all categories.
Compliance required within 300 hours' time in service after the effective date of this AD unless already accomplished.
To prevent possible fatigue failure of tail rotor hub bolt, Part Numbers 47-641-052-3 or - 5, accomplish the following:
(a) Remove and disassemble the tail rotor hub and blade assembly.
(b) Remove the metal grease seal from each tail rotor blade grip and install the seal, Part Number 47-641-042-3, in each blade grip to clear the head of the hub bolt.
(c) Remove the hub assembly bolts, Part Numbers 47-641-052-3 or -5, from the tail rotor hub assembly. Install hub bolts, Part Number 47-641-194-1, in the tail rotor hub as specified in paragraph 6-16.e., Section IV, Models 47D-1, 47G, and 47G-2 Maintenance and Overhaul Instruction Manual, as revised August 15, 1961, or as specified by equivalent FAAapproved procedures.
(d) Assemble and track and balance the tail rotor hub and blade assembly as specified in the pertinent Model Maintenance and Overhaul Instruction Manual or as specified in FAA approved equivalent procedures.
(e) Compliance with Bell Helicopter Company Service Bulletin No. 47-76-1 dated January 5, 1976, or later approved revision fulfills compliance with this AD.
This amendment becomes effective July 14, 1976.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 212
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 1 |
|---|---|
| 1947 | 10 |
| 1948 | 5 |
| 1949 | 3 |
| 1950 | 2 |
| 1951 | 7 |
| 1952 | 8 |
| 1953 | 8 |
| 1954 | 8 |
| 1955 | 7 |
| 1956 | 19 |
| 1957 | 15 |
| 1958 | 16 |
| 1959 | 10 |
| 1960 | 7 |
| 1962 | 1 |
| 1963 | 6 |
| 1964 | 1 |
| 1965 | 4 |
| 1966 | 1 |
| 1967 | 3 |
| 1968 | 1 |
| 1969 | 1 |
| 1972 | 1 |
| 1974 | 1 |
| 1975 | 2 |
| 1976 | 1 |
| 1979 | 1 |
| 1980 | 1 |
| 2010 | 1 |
60 with no year recorded