AD 2021-07-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter Deutschland GmbH and Eurocopter Canada Ltd. | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH and Eurocopter Canada Ltd.) Helicopters |
| aircraft | Airbus | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH and Eurocopter Canada Ltd.) Helicopters |
Unsafe Condition
cracks in the main rotor mast flange (flange) could result in failure of the flange and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
inspect the flange for cracks, if a crack is found, replace the main rotor mast with an airworthy one.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus Helicopters Deutschland GmbH Model BO-105A, BO-105C, BO-105S, BO-105LS A-1, and BO-105LS A-3 helicopters, certificated in any category, with a main rotor (M/R) mast part number (P/N) 4619 305 032 of M/R mast assembly P/N 4638 205 005, or M/R mast P/N 4639 305 002 of M/R mast assembly P/N 4639 205 017.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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