- Effective
- November 15, 1969
- Models
- PT6A-20, PT6A-27, PT6A-28, PT6A-6, PT6A-6A, PT6A-6B, PT6B-9
- Data sheet
- TCDSE4EA
- Registered aircraft
- 2,552 matched by model
- Product
- Engine
- Amendment
- 39-874
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 | df2b2bc7…dbb5995 | FAA DRS (API key needed) |
On this page
The airworthiness directive
69-23-06 UNITED AIRCRAFT OF CANADA, LIMITED: Amdt. 39-874. Applies to PT6 model series engines equipped with Pesco Model 024-800 fuel pumps as follows:
PT6A-6, -6A, -6B, PT6B-9 all engines PT6A-20 prior to S/N PC-E22480 PT6A-27 prior to S/N PC-E40311 PT6A-28 prior to S/N PC-E50054 except 50051, 50052
Compliance within 50 hours after the effective date of this Airworthiness Directive unless already accomplished.
To prevent disengagement of the fuel pump input coupling from the engine gearbox, remove retaining ring, Pesco P/N 99-4660 and install new snap ring Pesco P/N 99-4906. United Aircraft of Canada Ltd. Service Bulletin No. 174 pertains to this subject.
This amendment is effective November 15, 1969.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 2,552
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1942 | 1 |
|---|---|
| 1943 | 3 |
| 1944 | 3 |
| 1952 | 1 |
| 1954 | 3 |
| 1955 | 3 |
| 1956 | 1 |
| 1957 | 2 |
| 1958 | 1 |
| 1960 | 1 |
| 1961 | 2 |
| 1962 | 2 |
| 1964 | 2 |
| 1965 | 6 |
| 1966 | 7 |
| 1967 | 30 |
| 1968 | 28 |
| 1969 | 17 |
| 1970 | 18 |
| 1971 | 9 |
| 1972 | 8 |
| 1973 | 15 |
| 1974 | 13 |
| 1975 | 14 |
| 1976 | 20 |
| 1977 | 22 |
| 1978 | 30 |
| 1979 | 32 |
| 1980 | 44 |
| 1981 | 54 |
| 1982 | 31 |
| 1983 | 21 |
| 1984 | 26 |
| 1985 | 49 |
| 1986 | 23 |
| 1987 | 54 |
| 1988 | 87 |
| 1989 | 67 |
| 1990 | 73 |
| 1991 | 124 |
| 1992 | 61 |
| 1993 | 61 |
| 1994 | 64 |
| 1995 | 124 |
| 1996 | 122 |
| 1997 | 88 |
| 1998 | 111 |
| 1999 | 112 |
| 2000 | 104 |
| 2001 | 126 |
| 2002 | 62 |
| 2003 | 65 |
| 2004 | 102 |
| 2005 | 115 |
| 2006 | 6 |
| 2007 | 3 |
| 2008 | 3 |
| 2010 | 1 |
| 2011 | 2 |
| 2012 | 1 |
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 2 |
| 2019 | 3 |
| 2020 | 5 |
| 2021 | 5 |
| 2022 | 17 |
| 2023 | 22 |
| 2024 | 13 |
| 2025 | 10 |
| 2026 | 7 |
185 with no year recorded