AD 75-17-27
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Messerschmitt-Bolkow-Blohm (MBB) Models BO-105A and BO-105C Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Messerschmitt-Bolkow-Blohm (MBB) Models BO-105A and BO-105C Helicopters |
Unsafe Condition
Development of incipient cracks, corrosion, and excessive wear on bolts of the main rotor head.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine part number of Blade Mounting Bolts and replace P/N 105-14101.31 with P/N 105-14101.29. For Main Rotor Head Assemblies with Serial Number 50 or lower, replace Main Rotor Bolts P/N 105-14101.22 and .23 with revision letter 'g' or subsequent if bolts have revision 'a' through 'f'.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time in service after the effective date of this AD
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Affected Aircraft
Messerschmitt-Bolkow-Blohm (MBB) Models BO-105A and BO-105C helicopters incorporating Main Rotor Head Assembly No. 105-14101
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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