AD 50-40-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aero Spacelines, Incorporated | 377 | BOEING Model 377 Aircraft |
| aircraft | Aero Spacelines, Incorporated | 377MG | BOEING Model 377 Aircraft |
| aircraft | Aero Spacelines, Incorporated | 377SGT | BOEING Model 377 Aircraft |
Unsafe Condition
Circumferential cracks in the nose gear spindle adjacent to the weld between the spindle shaft (P/N 9-13735) and spindle bearing (P/N 6-25978), and cracks in the trapezoidal cutout of the nose landing gear terminal (P/N 15-22594).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the nose gear spindle for circumferential cracks using magnaflux, dye penetrant, or equivalent. Remove cracks by grinding within specified limits or reinforce with a 1/2-inch wall steel tube (P/N 5-39516-3). Inspect the nose landing gear terminal (P/N 15-22594) for cracks in the trapezoidal cutout and rework by grinding corners to a 0.50 inch radius if cracks are found.
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Compliance Time
Compliance required not later than December 15, 1950, and at periodic inspections nearest a 700-hour interval thereafter for the nose gear spindle. For the nose landing gear terminal, compliance required as soon as practicable but not later than November 1, 1952, and continuing at intervals not exceeding 800 hours thereafter.
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Affected Aircraft
BOEING Model 377 Aircraft (all serial numbers) including models 377, 377MG, 377SGT.
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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