AD 77-11-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Messerschmitt-Bolkow-Blohm GmbH Model BO-105 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Messerschmitt-Bolkow-Blohm GmbH Model BO-105 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directives; Messerschmitt-Bolkow-Blohm GmbH Model BO-105 Helicopters |
Unsafe Condition
Failure of the main rotor hub quadruple nuts and associated bolts could result in loss of the main rotor.
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Required Actions
Inspect main rotor hub quadruple nuts (P/N 105-14101.19, 105-14101.20) and bolts (P/N 105-14101.22, 105-14101.23) with over 1,400 hours time in service using magnaflux or FAA-approved equivalent. Replace cracked parts before flight. Replace nuts/bolts before 2,400 hours total time in service.
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Compliance Time
Within the next 100 hours time in service after the effective date (June 14, 1977), unless already accomplished within the last 200 hours time in service. Thereafter at intervals not to exceed 300 hours time in service from the last inspection.
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Affected Aircraft
Messerschmitt-Bolkow-Blohm GmbH Model BO-105A, BO-105C, BO-105S 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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