AD 64-21-06 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; BOEING VERTOL Model 107-II Helicopters |
Unsafe Condition
Fatigue failure of the rotor pitch housing in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect lug areas of rotor pitch housings P/N 107R2553-1 to -6 and blade sockets P/N 42R1043-7 and -8 using magnetic particle inspection or equivalent. Repeat inspections at intervals not exceeding 30 hours' time in service. Install crack detector wire per Boeing Service Bulletin 107-343 for specific housings based on time in service. Conduct daily visual inspections and retire housings at 5,000 hours' total time.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight unless already accomplished within specified intervals. Compliance adjustments may be requested through FAA.
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Affected Aircraft
BOEING VERTOL Model 107-II helicopters with rotor pitch housings P/N 107R2553-1 to -6 and blade sockets P/N 42R1043-7, -8, -11 to -14.
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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