- Effective
- April 20, 1967
- Models
- B-2, B-2A, B-2B
- Data sheet
- TCDS2H2
- Registered aircraft
- 53 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-373
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 | 19 KB | c246b8ba…373c43a | FAA DRS (API key needed) |
On this page
The airworthiness directive
67-09-02 BRANTLY: Amdt. 39-373 Part 39 Federal Register March 21, 1967. Applies to Models B-2, B-2A, and B-2B Helicopters with P/N B2-324 Transmission Serial Numbers Prior to Serial Number 307.
Compliance required as indicated.
To improve the service life and reliability of the upper main rotor mast bearing, within the next 100 hours' time in service after the effective date of this AD, remove the Fafnir P/N 212K bearing presently installed and replace it with an Indiana Gear Works P/N 4524A56, Revision E, sealed bearing. This substitution is to be accomplished as prescribed by Brantly Helicopter Company Service Bulletin No. 21 and applicable sections of the Model B-2 Series helicopter maintenance manuals.
This directive effective April 20, 1967
Affected TCDS · 1
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.
| 1959 | 1 |
|---|---|
| 1960 | 1 |
| 1961 | 5 |
| 1962 | 2 |
| 1963 | 5 |
| 1964 | 6 |
| 1965 | 1 |
| 1966 | 4 |
| 1967 | 2 |
| 1968 | 2 |
| 1992 | 1 |
| 1997 | 1 |
22 with no year recorded