AD 75-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Messerschmitt Boelkow Blohm (MBB) Model BO-105 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Messerschmitt Boelkow Blohm (MBB) Model BO-105 Helicopters |
Unsafe Condition
Failure in service of main rotor hub quadruple nuts due to cracks resulting from manufacturing defects.
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Required Actions
Determine the production lot number of the installed main rotor hub quadruple nuts (P/N 105-14101.19 and .20) within twenty hours time in service after the effective date. If the lot number is 06, 07, or cannot be determined, remove and replace the quadruple nuts with serviceable parts of the same part number before further flight.
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Compliance Time
within twenty hours time in service after the effective date
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Affected Aircraft
Messerschmitt Boelkow Blohm (MBB) Model BO-105A and BO-105C helicopters certificated in all categories.
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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