- Effective
- September 3, 1974
- Model
- TFE731-2
- Data sheet
- TCDSE6WE
- Registered aircraft
- 1,026 matched by model
- Product
- Engine
- Amendment
- 39-1941
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 | 1344b886…01759c2 | FAA DRS (API key needed) |
On this page
The airworthiness directive
74-18-12 AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Amendment 39-1941. Applies to AiResearch Model TFE 731-2-2B engines installed in, but not limited to Lear-Gates Learjet model 35/36 Aircraft, certificated in all categories.
(A) Before further flight, unless previously accomplished, and prior to the installation of replacement fuel control assemblies, replace the hydromechanical fuel control orifice assembly in accordance with AiResearch Alert Service Bulletin TFE 731-A73-3006, dated August 12, 1974, or later FAA approved revisions.
(B) Equivalent procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiation data.
(C) Aircraft may be flown to a base for performance of maintenance required by this AD per FAR's 21.197 and 21.199.
This amendment is effective September 3, 1974, for all persons except those to whom it was made effective immediately by telegram dated August 5, 1974.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1,026
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1966 | 2 |
|---|---|
| 1967 | 3 |
| 1969 | 2 |
| 1972 | 1 |
| 1974 | 11 |
| 1975 | 10 |
| 1976 | 18 |
| 1977 | 21 |
| 1978 | 10 |
| 1979 | 13 |
| 1980 | 35 |
| 1981 | 49 |
| 1982 | 45 |
| 1983 | 24 |
| 1984 | 43 |
| 1985 | 26 |
| 1986 | 23 |
| 1987 | 27 |
| 1988 | 28 |
| 1989 | 17 |
| 1990 | 19 |
| 1991 | 16 |
| 1992 | 20 |
| 1993 | 26 |
| 1994 | 22 |
| 1995 | 24 |
| 1996 | 26 |
| 1997 | 23 |
| 1998 | 28 |
| 1999 | 39 |
| 2000 | 38 |
| 2001 | 57 |
| 2002 | 51 |
| 2003 | 20 |
| 2004 | 44 |
| 2005 | 25 |
| 2006 | 2 |
| 2007 | 1 |
| 2008 | 1 |
| 2011 | 1 |
135 with no year recorded