- Effective
- August 31, 1978
- Models
- PT6T-3, PT6T-3A, PT6T-6
- Data sheet
- TCDSE22EA
- Registered aircraft
- 78 matched by model
- Product
- Engine
- Amendment
- 39-3285
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 | 88dcdacd…4f20e67 | FAA DRS (API key needed) |
On this page
The airworthiness directive
78-17-05 PRATT & WHITNEY AIRCRAFT OF CANADA, LIMITED: Amendment 39-3285. Applies to all Pratt & Whitney Aircraft of Canada, Limited PT6T-3 and PT6T-6 turboshaft engines with automatic fuel control with Aviation Electric Ltd. Parts List 2524381-5, 3244712-1 and -2, 3244717-1 through -5, 3244721-1 through -5, 3244735-1 through -7 and 3244737-1 through -7.
Compliance required within the next 50 hours in service, after the effective date of this AD, unless already accomplished.
To preclude rupture of the bypass valve diaphragm in the automatic fuel control unit, replace the part number 2526477 diaphragm with part number 323451 diaphragm in accordance with Paragraph 2, Accomplishment Instructions in Pratt & Whitney Aircraft of Canada, Limited, Alert Service Bulletin No. 5153, or approved equivalent parts and procedure.
Aircraft may be flown to a base for performance of maintenance required by this AD per FAR 21.197.
Any equivalent parts and procedure must be approvedby the Chief, Engineering and Manufacturing Branch, of the Eastern Region of the Federal Aviation Administration (FAA).
This amendment is effective August 31, 1978.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 78
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1956 | 1 |
|---|---|
| 1957 | 1 |
| 1958 | 2 |
| 1959 | 1 |
| 1962 | 2 |
| 1970 | 1 |
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 1 |
| 1975 | 2 |
| 1977 | 2 |
| 1978 | 2 |
| 1979 | 4 |
| 1980 | 7 |
| 1981 | 1 |
| 1982 | 2 |
| 1986 | 1 |
| 1987 | 1 |
| 1988 | 4 |
| 1989 | 4 |
| 1990 | 2 |
| 1991 | 5 |
| 1992 | 2 |
| 1993 | 3 |
| 1994 | 1 |
| 1995 | 1 |
| 1997 | 2 |
| 1998 | 1 |
| 1999 | 1 |
| 2000 | 1 |
| 2003 | 1 |
| 2004 | 1 |
| 2005 | 3 |
| 2006 | 1 |
| 2015 | 1 |
| 2022 | 1 |
| 2024 | 2 |
| 2025 | 1 |
7 with no year recorded