AD 60-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049F-55 (USAF C-121C) | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED Model 1049 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049H-82 | LOCKHEED Model 1049 Series Aircraft |
Unsafe Condition
Failure of the main landing gear drag strut cylinder, P/N 471035-3, due to cracks in the root of the 6 5/16-inch diameter thread and thread relief area.
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Required Actions
Inspect the root of the 6 5/16-inch diameter thread and thread relief area using dye penetrant, magnetic particle, or eddy current methods. If cracks are found, replace parts before further flight. If no cracks, reinspect every 1,000 or 5,000 hours' time in service depending on inspection method. Rework by remachining threads, cadmium plating, replacing nut with P/N 557466-1, and proof testing to 12,300 p.s.i. if required.
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Compliance Time
Within the next 425 hours' time in service
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Affected Aircraft
Lockheed Model 1049 Series Aircraft equipped with Drag Strut Assemblies with ground Acme threads, P/N 469080-5 and -6, Serial Numbers 6001 through 6363 and 10001 through 10036, manufactured by Sargent Engineering Corporation.
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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