AD 54-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
Unsafe Condition
Premature failure of flexible hose in the feathering line and penetration of fire from zone 1 into zone 2 due to engine fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace flexible hose assemblies with those meeting current fire resistance requirements per specified service bulletins. Install steel plates over lower engine cowling longerons adjacent to the diaphragm per service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
April 1, 1955
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Models 49, 649, 749, and 1049 airplanes as noted in referenced service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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