AD 48-33-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 49-46, 149-46, 649-79, and 749-79 |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49-46, 149-46, 649-79, and 749-79 |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49-46, 149-46, 649-79, and 749-79 |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49-46, 149-46, 649-79, and 749-79 |
Unsafe Condition
Existing fuel placards may provide incorrect fuel load and transfer instructions, leading to improper fuel distribution and potential flight instability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove existing fuel placards and install three new placards specifying fuel system operational procedures, including fuel distribution limits and crossfeed operation restrictions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance with new placard restrictions required immediately. Placards to be installed not later than December 1, 1948.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Models 49-46, 149-46, 649-79, and 749-79 through serial number 2588.
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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