AD 74-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; VERTOL Model 107-II type Helicopters |
Unsafe Condition
Failure of the rotor blade inspection system could result in blade separation or structural failure of the rotor blades.
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Required Actions
Initiate an approved rotor blade inspection program prior to the next flight after August 13, 1974. The program must include inspections and maintenance per Boeing Vertol Service Bulletin 107-329 or later FAA-approved revisions, with pilot-performed visual checks of the rotor blade pressure indicators.
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Compliance Time
prior to the next flight after the effective date of this AD (August 13, 1974)
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Affected Aircraft
VERTOL Model 107-II type helicopters certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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