AD 83-18-51 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 234 | Airworthiness Directives; BOEING VERTOL COMPANY Model 234 Series Helicopters |
Unsafe Condition
Cracking of the main rotor head pitch shafts Part Numbers 114R2088-7, -14, -15, -16 could cause possible hazards in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct an eddy current inspection of the pitch shaft per Boeing Vertol Service Bulletin 234-64-1006, revise 2 or part 3. Repeat inspections at intervals not exceeding 15 hours time in service. Remove and replace cracked shafts before further flight. Replace pitch shafts P/N 114R2088-14/-16 within 25 hours or before 550 hours, and P/N 114R2088-7/-15 within 25 hours or before 700 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight for initial inspections and cracked shafts. Repeat inspections at intervals not exceeding 15 hours time in service. Replace specific P/N shafts within 25 hours time in service from AD effective date or prior to 550/700 hours time in service, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Vertol Model 234 series helicopters with main rotor head pitch shafts P/N 114R2088-7, -14, -15, -16.
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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