AD 76-18-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Messerschmitt-Bolkow-Blohm Model BO-105A and BO-105C Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Messerschmitt-Bolkow-Blohm Model BO-105A and BO-105C Helicopters |
Unsafe Condition
Failure of the main rotor hydraulic actuator and loss of control of the helicopter due to cracks in the piston rods, P/N D133-750.08E, with S/N's 101 through 440.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect piston rods for cracks using dye penetrant per MBB Service Bulletin No. 40-19. Replace cracked piston rods with serviceable parts of same part number. Disassemble actuators and replace piston rods with parts having serial numbers outside 101-440.
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Compliance Time
Before the accumulation of 600 hours total helicopter time in service or within the next 25 hours time in service after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 600 hours time in service until modified. For modification (e), comply within 25 hours time in service after the effective date or based on time/maturity criteria in paragraphs (d)(1) and (d)(2).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Messerschmitt-Bolkow-Blohm Model BO-105A and BO-105C helicopters with Teledyne Hydra-Power hydraulic actuators P/N 105-45021, serial numbers listed in the AD, and piston rods P/N D133-750.08E with S/N 101 through 440.
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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