AD 77-15-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Messerschmitt-Bolkow-Blohm (MBB) Model BO-105A and BO-105C Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Messerschmitt-Bolkow-Blohm (MBB) Model BO-105A and BO-105C Helicopters |
Unsafe Condition
Failure of the tail-rotor drive system due to cracks in the tail boom skin in the vicinity of the three bearing brackets, P/N 105-30251.17, .18, and .19.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 5 hours time in service after the effective date, inspect tail boom skin for cracks near the specified bearing brackets. Repeat inspections every 50 hours if no cracks found; if cracks found, stop-drill cracks under 10 mm and inspect every 10 hours, or perform service bulletin if more severe cracks. Compliance with service bulletin required before further flight if conditions met.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 5 hours time in service after the effective date of this AD
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Affected Aircraft
Messerschmitt-Bolkow-Blohm (MBB) Model BO-105A and BO-105C Helicopters, except those with tail-rotor shaft bearing bracket P/N 105-30251.40.
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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