AD 58-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Aircraft |
Unsafe Condition
Cracks have been found or failures have occurred in the nose wheel upper retract link assembly (P/N 5325437), specifically in the forged end fitting (P/N 5328993) at the 1/8-inch radius where the fitting is machined to the O.D. of the tube (P/N 2329712). Failures resulted in nose gear folding during landing and taxi.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the forged end fittings with a 1/8-inch radius using magnaflux or dye penetrant. Replace cracked parts; rework uncracked parts to increase the radius to 3/4-inch, polish to 32-micro-inch finish, and apply protective coatings. Reinspect at intervals nearest 300 hours until rework and continue inspections post-rework to ensure effectiveness.
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Compliance Time
At the earliest possible opportunity where facilities are available, and in any case, at the inspection period nearest 100 hours. After initial inspection, reinspect at intervals nearest 300 hours until rework.
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Affected Aircraft
Douglas DC-6 and DC-7 Series aircraft (all models: DC-6, DC-6A, DC-6B, DC-7, DC-7B, DC-7C) with nose gear upper retract link assemblies (P/N 5325437) not incorporating the 3/4-inch radius (specifically those delivered before DC-6 fuselage No. 435 and DC-7 fuselage No. 434).
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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