- Effective
- December 19, 1975
- Models
- HS 748 Series 2A, HS 748 Series 2B, 727-100 Series, 727-100C Series, 727-200 Series, 727 Series and 87 more
- Registered aircraft
- 209 matched by model
- Product
- Appliance
- Amendment
- 39-2459
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.
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On this page
The airworthiness directive
75-08-17 LOCKHEED AIRCRAFT SERVICE COMPANY: Amendment 39-2169 as amended by Amendment 39-2459. Applies to Lockheed Aircraft Service Company Model 209 Digital Flight Data Recorders installed in, but not limited to Boeing 727, 737 and 747, Douglas DC-8, DC-9, and DC-10, Lockheed L-1011, Dassault/Sud Fan Jet Falcon, Hawker-Siddeley DH-125 and 748, and Fokker F-28 airplanes, and Boeing-Vertol 114A (U.S. Army CH-47A) helicopters, certificated in all categories.
Compliance required on or before January 1, 1976, unless already accomplished, except for Boeing 727 and 737 airplanes for which compliance is required on or before June 30, 1976, unless already accomplished.
To provide satisfactory recording of the required flight data parameters, install four identical vibration isolators under the ARINC 1/2 ATR rack supporting the Model 209 Digital Flight Data Recorder in accordance with Lockheed Aircraft Service Company Drawing No. 10077J500, Revision F, dated March 14, 1975, or later FAA-approved revisions.
Equivalent vibration isolators and/or installations may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.
Amendment 39-2169 was effective May 20, 1975.
This amendment 39-2459 becomes effective December 19, 1975.
Affected TCDS · 12
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 209
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1966 | 4 |
|---|---|
| 1967 | 9 |
| 1968 | 4 |
| 1969 | 8 |
| 1970 | 4 |
| 1971 | 3 |
| 1972 | 2 |
| 1973 | 1 |
| 1974 | 3 |
| 1975 | 6 |
| 1976 | 5 |
| 1977 | 4 |
| 1978 | 3 |
| 1979 | 3 |
| 1980 | 1 |
| 1981 | 6 |
| 1982 | 2 |
| 1986 | 2 |
| 1987 | 6 |
| 1988 | 5 |
| 1989 | 3 |
| 1990 | 3 |
| 1991 | 23 |
| 1992 | 5 |
| 1993 | 1 |
| 1994 | 1 |
| 1996 | 1 |
| 1997 | 6 |
| 1998 | 6 |
| 1999 | 16 |
63 with no year recorded