AD 83-16-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 234 | Airworthiness Directives; BOEING VERTOL COMPANY Model 234 Series Helicopters |
Unsafe Condition
Damage or loss of main rotor blade tip cap and weights could cause possible hazards in flight.
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Required Actions
Conduct a borescope inspection of the inside root end of the spar for excessive potting material, remove cracked or excess potting material exceeding one cubic inch, and follow Boeing Vertol Service Bulletin No. 234621004 or FAA-approved equivalent. Compliance must be within specified time frames based on hours time in service.
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Compliance Time
Prior to further flight for blades with less than 100 hours time in service; within next 30 hours time in service for blades with 100 to less than 500 hours; within next 75 hours time in service for blades with 500 or more hours.
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Affected Aircraft
Boeing Vertol Model 234 series 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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