- Effective
- February 10, 1966
- Models
- 56TC, 58, 58A, 65, 65-80, 65-88 and 36 more
- Registered aircraft
- 1,601 matched by model
- Product
- Appliance
- Amendment
- 39-179
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 January 21, 2026.
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 | 38512b1f…2a06278 | FAA DRS (API key needed) |
On this page
The airworthiness directive
66-02-01 BEECHCRAFT: Amendment 39-179 Part 39 Federal Register January 8, 1966. Applies to all Airplanes Equipped with Model BAK-109 Air Conditioners.
Compliance required within the next 100 hours' time in service after the effective date of this AD unless already accomplished.
To prevent further failures of the compressor motor fan, replace the fan in accordance with Beech Service Bulletin No. 65-4 dated March 1965.
NOTE: The Beechcraft Model BAK-109 Air Conditioner is known to be installed in, but not limited to, Beech Models 18, 50, 65 Series; Douglas Model DC3; Lockheed Model 18; Viscount Models 744, 745D and 810 Series airplanes.
This directive effective February 10, 1966.
Affected TCDS · 11
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1,601
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1935 | 1 |
|---|---|
| 1936 | 3 |
| 1937 | 1 |
| 1939 | 1 |
| 1940 | 4 |
| 1941 | 2 |
| 1942 | 8 |
| 1943 | 9 |
| 1944 | 16 |
| 1945 | 3 |
| 1949 | 1 |
| 1955 | 1 |
| 1960 | 3 |
| 1961 | 2 |
| 1962 | 10 |
| 1963 | 1 |
| 1964 | 3 |
| 1965 | 10 |
| 1966 | 19 |
| 1967 | 67 |
| 1968 | 12 |
| 1969 | 9 |
| 1970 | 31 |
| 1971 | 16 |
| 1972 | 35 |
| 1973 | 37 |
| 1974 | 44 |
| 1975 | 53 |
| 1976 | 59 |
| 1977 | 72 |
| 1978 | 83 |
| 1979 | 95 |
| 1980 | 108 |
| 1981 | 73 |
| 1982 | 40 |
| 1983 | 22 |
| 1984 | 47 |
| 1985 | 37 |
| 1986 | 3 |
| 1987 | 12 |
| 1988 | 8 |
| 1989 | 11 |
| 1990 | 21 |
| 1991 | 16 |
| 1992 | 13 |
| 1993 | 14 |
| 1994 | 22 |
| 1995 | 13 |
| 1996 | 15 |
| 1997 | 23 |
| 1998 | 23 |
| 1999 | 26 |
| 2000 | 20 |
| 2001 | 24 |
| 2002 | 8 |
| 2003 | 1 |
| 2004 | 5 |
| 2005 | 1 |
284 with no year recorded