- Effective
- October 29, 1975
- Models
- T5307A, T5309A, T5309B, T5309C, T5311A, T5311B and 3 more
- Registered aircraft
- 133 matched by model
- Product
- Engine
- Amendment
- 39-2385
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 | 877569ce…9ba6dc0 | FAA DRS (API key needed) |
On this page
The airworthiness directive
75-22-02 AVCO LYCOMING: Amendment 39-2385. Applies to all Avco Lycoming T53 series engines. To prevent secondary failure of the N2 accessory drive shaft, as a result of binding of the torquemeter boost pump drive shaft, remove torquemeter boost pump, Part Number 1-300-221-01 or Part Number 1-300-221- 02, and replace with Part Number 1-300-221-03 or Part Number 1-300-221-04 within 200 hours time in service after the effective date of this AD. NOTE: Avco Lycoming Service Bulletin Number 0031 pertains to this subject. This amendment becomes effective October 29, 1975.
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 133
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1944 | 1 |
|---|---|
| 1960 | 1 |
| 1961 | 2 |
| 1962 | 12 |
| 1963 | 6 |
| 1964 | 8 |
| 1965 | 8 |
| 1966 | 8 |
| 1967 | 4 |
| 1968 | 11 |
| 1969 | 6 |
| 1970 | 5 |
| 1971 | 5 |
| 1972 | 3 |
| 1973 | 5 |
| 1974 | 4 |
| 1975 | 5 |
| 1976 | 4 |
| 1977 | 2 |
| 1978 | 1 |
| 1979 | 3 |
| 1980 | 1 |
| 1982 | 1 |
| 1988 | 1 |
| 1994 | 1 |
| 1995 | 1 |
| 1996 | 1 |
| 1997 | 1 |
| 1999 | 1 |
| 2003 | 1 |
| 2004 | 1 |
| 2012 | 1 |
18 with no year recorded