AD 60-04-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 049, 149, 649, and 749 Series Aircraft |
Unsafe Condition
Fatigue failures in the main landing gear outer cylinder at the 0.125-inch radius of the shoulder where the drag strut-side brace collar retaining nut bears.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracks using ultrasonic shear wave, magnetic particle, or radiographic methods. Rework the cylinder area by cleaning, polishing, and shotpeening. Replace cracked cylinders before further flight. Reinspect every 1,000 hours until rework is done, then reinspect every 9,000 hours post-rework.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 400 hours' time in service for initial inspection. Rework must be done within 3,000 or 4,000 hours' time in service depending on inspection method. Reinspections required every 1,000 hours until rework, then every 9,000 hours post-rework.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Models 049, 149, 649, and 749 Series Aircraft with Cleveland Pneumatic Model 8298 Series Main Landing Gear Struts and removable side brace attachment collar.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.