AD 85-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM Model BO-105 Series Helicopters |
Unsafe Condition
Jamming of the helicopter main rotor control system due to binding of the System II hydraulic actuators.
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Required Actions
Before the first flight of each day after the effective date, operate the System II hydraulic actuators to detect binding. Within the next 10 hours time in service, clean and seal the actuators per MBB BO-105 ASB No. 26 Part 2B or equivalent. After sealing, the daily operational check is no longer required.
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Compliance Time
Before the first flight of each day after the effective date and within the next 10 hours time in service after the effective date.
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Affected Aircraft
MESSERSCHMITT-BOLKOW-BLOHM Model BO-105A, BO-105C, BO-105S helicopters through serial No. 750 equipped with tandem hydraulic units having Part Numbers 105-45021, 105-45023, 105-45028, 105-83001, 105-83011, D133-3073, or DSK1-30142.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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