AD 82-20-06 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 234 | Airworthiness Directives; BOEING AIRPLANE COMPANY, VERTOL DIVISION Model 234 Series Helicopters |
Unsafe Condition
Cracks in the aft and forward main rotor hubs and insufficient height difference between the rotorshaft spline and hub upper surface could result in hub failure and loss of control.
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Required Actions
Inspect the aft main rotor hub for cracks within the next 60 hours time in service or before 700 hours time in service, whichever is later. Inspect the forward main rotor hub for cracks within the next 25 hours time in service or before 450 hours time in service, whichever is later. Remove hubs with cracks and replace with serviceable parts. Ensure washer installation and torque the main rotor hub nut per specifications. Repeat inspections every 125 hours time in service after initial compliance.
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Compliance Time
Within the next 60 hours time in service from the effective date or before the accumulation of 700 hours time in service for aft hub inspections; within the next 25 hours time in service from the effective date of this AD revision or before 450 hours time in service for forward hub inspections. Repeat inspections not to exceed 125 hours additional time in service from the last inspection.
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Affected Aircraft
Boeing Airplane Company, Vertol Division Model 234 series helicopters with main rotor hubs P/N 114R2050-17, -18, -23, and -24.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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