AD 73-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; BOEING VERTOL Model 107-II Type Helicopters |
Unsafe Condition
Surface defects such as pits, arc burns, or cracks in P/N 107D2067-1 or -3 aft transmission quill shafts can cause complete failure.
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Required Actions
Inspect and code mark quill shafts with 600 hours total time or less, strip and inspect under magnification, code mark acceptable units with 'R' suffix, apply surface treatments per specified documents, and replace defective shafts.
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Compliance Time
Within 25 flight hours after the effective date of this AD or prior to accumulating 600 hours total time in service.
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Affected Aircraft
BOEING VERTOL Model 107-II type helicopters with P/N 107D2067-1 or -3 quill shafts, except those specified in Service Bulletin A107-320, Revision C.
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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