AD 84-10-51 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 234 | Airworthiness Directives; BOEING VERTOL COMPANY Model 234 Series Helicopters |
Unsafe Condition
Cracking of the forward main rotor drive shaft could cause possible hazards in flight.
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Required Actions
Inspect the rotor drive shaft within 70 hours time in service after the effective date or upon 1,600 total hours on the shaft, whichever is later. Subsequent inspections must be done at intervals not exceeding 35 hours time in service. Remove and replace cracked shafts before further flight. Use Service Bulletin 234-63-1009 or equivalent method approved by the FAA.
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Compliance Time
Within 70 hours time in service after the effective date of this amendment or upon accumulation of 1,600 total hours time in service on the rotor shaft, whichever occurs later, and thereafter at intervals not to exceed 35 hours time in service from the last inspection
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Affected Aircraft
BOEING VERTOL COMPANY Model 234 series helicopters equipped with forward main rotor drive shaft P/N 114D1245-7
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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