- Effective
- November 7, 1978
- Models
- IO-540-G1B5, IO-540-K1F5, IO-540-P1A5, IO-540-S1A5
- Data sheet
- TCDS1E4
- Registered aircraft
- 4,238 matched by model
- Product
- Engine
- Amendment
- 39-3334
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 | 20 KB | 6812cb62…cc8de44 | FAA DRS (API key needed) |
On this page
The airworthiness directive
78-23-08 AVCO LYCOMING: Amendment 39-3334. Applies to all IO-540-G1B5, -K1F5, -P1A5 and - S1A5 series engines with serial numbers up to and including L-17835-48 or -45A and all IO-540-G1B5, -K1F5, - P1A5, -S1A5 series engines overhauled (also known as remanufactured) by Lycoming prior to March 30, 1978. Compliance required within the next 50 hours' in service after the effective date of this AD, unless already accomplished. To prevent possible fuel leakage due to failure of the fuel pump to fuel injector tube elbow replace the fuel pump to fuel injector tube part number LW-10445 and the fuel pump to fuel injector tube elbow, part number LW-10446 with flexible hose assembly, part number LW-12877-6-051. Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration (FAA), Eastern Region, may adjust the compliance time specified in this AD. (NOTE: AVCO Lycoming Service Bulletin No. 421 covers this subject.) This amendment is effective November 7, 1978.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 4,238
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 1 |
|---|---|
| 1948 | 2 |
| 1950 | 3 |
| 1951 | 4 |
| 1953 | 1 |
| 1956 | 3 |
| 1958 | 1 |
| 1959 | 1 |
| 1960 | 3 |
| 1961 | 1 |
| 1962 | 2 |
| 1963 | 2 |
| 1964 | 8 |
| 1965 | 16 |
| 1966 | 18 |
| 1967 | 9 |
| 1968 | 18 |
| 1969 | 19 |
| 1970 | 7 |
| 1971 | 17 |
| 1972 | 8 |
| 1973 | 11 |
| 1974 | 13 |
| 1975 | 15 |
| 1976 | 43 |
| 1977 | 149 |
| 1978 | 296 |
| 1979 | 243 |
| 1980 | 134 |
| 1981 | 156 |
| 1982 | 80 |
| 1983 | 50 |
| 1984 | 42 |
| 1985 | 28 |
| 1986 | 11 |
| 1987 | 17 |
| 1988 | 24 |
| 1989 | 37 |
| 1990 | 27 |
| 1991 | 22 |
| 1992 | 23 |
| 1993 | 50 |
| 1994 | 33 |
| 1995 | 50 |
| 1996 | 55 |
| 1997 | 73 |
| 1998 | 230 |
| 1999 | 185 |
| 2000 | 228 |
| 2001 | 146 |
| 2002 | 125 |
| 2003 | 183 |
| 2004 | 243 |
| 2005 | 294 |
| 2006 | 87 |
| 2007 | 15 |
| 2008 | 10 |
| 2009 | 12 |
| 2010 | 15 |
| 2011 | 12 |
| 2012 | 9 |
| 2013 | 6 |
| 2014 | 7 |
| 2015 | 4 |
| 2016 | 8 |
| 2017 | 4 |
| 2018 | 8 |
| 2019 | 8 |
| 2020 | 8 |
| 2021 | 7 |
| 2022 | 8 |
| 2023 | 7 |
| 2024 | 7 |
| 2025 | 16 |
| 2026 | 7 |
513 with no year recorded