- Models
- DC-7, DC-7B, DC-7C, 1049-54, 1049B-55 (Navy R7V-1), 1049C-55 and 12 more
- Registered aircraft
- 9 matched by model
- Product
- Aircraft · Large airplane
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 | c9963cc3…1b2c534 | FAA DRS (API key needed) |
On this page
The airworthiness directive
57-03-02 DOUGLAS AND LOCKHEED: Applies to Lockheed Constellation Series Airplanes and Douglas DC-7 Series Airplanes With Wright Engines.
Compliance required not later than December 1, 1957.
Under certain cold weather operating conditions it is possible for the fuel inlet strainer and other parts in the engine master control to become clogged with ice as a result of entrained water in the fuel freezing on the screen. This has caused a loss of power on all engines simultaneously.
To relieve strainer icing, a screen having a bypass valve Bendix P/N 366204 should be installed in replacement of the screen not having a bypass valve. Bendix Service Bulletin No. 797 covers this subject. It should be noted that the incorporation of the screen with bypass will not positively prevent power loss from fuel ice; therefore, work is continuing to develop a means to protect other portions of the master control downstream of the inlet strainer. If necessary, a supplement to this notewill be published when additional information becomes available.
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 9
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 1 |
|---|---|
| 1949 | 1 |
| 1957 | 2 |
| 1958 | 2 |
| 1959 | 1 |
2 with no year recorded