AD 55-23-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 1049C, 1049D, 1049E, and 1049G |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 1049C, 1049D, 1049E, and 1049G |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 1049C, 1049D, 1049E, and 1049G |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED Models 1049C, 1049D, 1049E, and 1049G |
Unsafe Condition
Cracks in the outer wing main beam web between wing Stations 510 and 668 left and right due to fatigue.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the outer wing main beam web between Stations 510 and 668 for cracks as soon as practical and repeat at 125-hour intervals until reinforcement is done. Reinforce the web with three extruded 75S-T6 stiffeners (LS2186 or LS6097 or equivalent) between each original stiffener as soon as possible but no later than the next scheduled progressive overhaul or December 1, 1956, whichever comes first.
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Compliance Time
Compliance required as indicated. Reinforcement must be accomplished as soon as possible but not later than the next scheduled progressive overhaul time, and in no case later than December 1, 1956, whichever occurs first.
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Affected Aircraft
Lockheed Models 1049C, D, E, and G with serial numbers 4163-4166, 4520-4581, 4583-4605, 4608-4615, and 4620.
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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