- Models
- O-320-A1A, O-320-A2A
- Data sheet
- TCDSE-274
- Registered aircraft
- 27,355 matched by model
- Product
- Engine
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 | 2cd6615f…82310ed | FAA DRS (API key needed) |
On this page
The airworthiness directive
55-02-02 LYCOMING: Applies to Model O-320 Engines Below Serial Number 612 Installed in Aircraft Equipped With Fixed Pitch Propellers. Compliance required as soon as possible but not later than February 28, 1955. Several immediate forced landings have occurred with aircraft equipped with the above engine and propeller combinations due to rapid loss of engine oil from the engine accessory drive adapter gasket location. To preclude this possibility, all such engines should be inspected to insure that the proper gasket is installed under the lower accessory drive adapter cover. For engines with fixed pitch propellers, Lycoming P/N 69551, gasket must be installed at this location. (Lycoming Service Bulletin No. 176 covers this same subject.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 27,355
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1910 | 1 |
|---|---|
| 1930 | 1 |
| 1931 | 2 |
| 1932 | 1 |
| 1939 | 1 |
| 1940 | 4 |
| 1941 | 10 |
| 1942 | 2 |
| 1943 | 5 |
| 1945 | 3 |
| 1946 | 88 |
| 1947 | 72 |
| 1948 | 39 |
| 1949 | 13 |
| 1950 | 30 |
| 1951 | 42 |
| 1952 | 42 |
| 1953 | 55 |
| 1954 | 106 |
| 1955 | 390 |
| 1956 | 467 |
| 1957 | 526 |
| 1958 | 367 |
| 1959 | 361 |
| 1960 | 213 |
| 1961 | 193 |
| 1962 | 270 |
| 1963 | 187 |
| 1964 | 296 |
| 1965 | 392 |
| 1966 | 634 |
| 1967 | 839 |
| 1968 | 1,370 |
| 1969 | 1,048 |
| 1970 | 533 |
| 1971 | 630 |
| 1972 | 905 |
| 1973 | 1,170 |
| 1974 | 1,555 |
| 1975 | 1,388 |
| 1976 | 1,511 |
| 1977 | 1,269 |
| 1978 | 1,362 |
| 1979 | 1,080 |
| 1980 | 417 |
| 1981 | 495 |
| 1982 | 202 |
| 1983 | 125 |
| 1984 | 160 |
| 1985 | 182 |
| 1986 | 95 |
| 1987 | 54 |
| 1988 | 72 |
| 1989 | 135 |
| 1990 | 96 |
| 1991 | 97 |
| 1992 | 96 |
| 1993 | 122 |
| 1994 | 132 |
| 1995 | 99 |
| 1996 | 105 |
| 1997 | 99 |
| 1998 | 135 |
| 1999 | 153 |
| 2000 | 139 |
| 2001 | 123 |
| 2002 | 135 |
| 2003 | 157 |
| 2004 | 110 |
| 2005 | 117 |
| 2006 | 18 |
| 2007 | 13 |
| 2008 | 14 |
| 2009 | 17 |
| 2010 | 18 |
| 2011 | 18 |
| 2012 | 10 |
| 2013 | 10 |
| 2014 | 8 |
| 2015 | 7 |
| 2016 | 11 |
| 2017 | 7 |
| 2018 | 9 |
| 2019 | 10 |
| 2020 | 9 |
| 2021 | 9 |
| 2022 | 11 |
| 2023 | 10 |
| 2024 | 14 |
| 2025 | 5 |
| 2026 | 2 |
3,800 with no year recorded