AD 81-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM GMBH Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM GMBH Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM GMBH Model BO-105 Series Helicopters |
Unsafe Condition
Failure of the helicopter drive system due to defective selflocking nutplates on Bendix drive shafts, P/N 19E146-1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect nutplates for selflocking capability within 10 hours time in service after the effective date. If defective, remove drive shaft before further flight and replace with a serviceable shaft with new nutplates P/N LN 29679AM9 or marked with a blue dot. Alternatively, install drive shaft tab washers P/N LN 9023-B8-1.4544.9 and comply with subsequent requirements within 300 hours time in service. Inspect spare drive shafts before release to service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 10 hours time in service after the effective date
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MESSERSCHMITT-BOLKOW-BLOHM GMBH Model BO-105A, BO-105C, BO-105S helicopters with installed Bendix drive shafts P/N 19E146-1
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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