AD 59-12-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049F-55 (USAF C-121C) | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049H-82 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 049, 149, 649, 749, and 1049 Series Aircraft |
Unsafe Condition
Corrosion and cracking on the wing Station 80 bathtub fittings, part numbers 251245, 251246, 310008, and 310009, could lead to structural failure.
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Required Actions
Inspect for cracked bathtub fittings by removing the wing-to-fuselage fillet and dye checking the edges. Replace cracked fittings. Inspect for corrosion on fittings and adjacent areas; replace fittings if corrosion exceeds 0.025-inch depth or 0.70-inch diameter, or repair skin corrosion within specified limits. Reinspect every 4,000 flight-hours or at block overhaul, extendable to 12,000 flight-hours if all fittings are replaced.
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Compliance Time
Within 4,000 flight-hours or at the next block overhaul, whichever occurs first, for aircraft with 12,000 or more flight-hours.
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Affected Aircraft
Lockheed Models 049, 149, 649, 749, and 1049 Series aircraft, including specific models like 1049-54, 1049B-55, 1049C-55, 1049D-55, 1049E-55, 1049F-55, and 1049G-82.
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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