AD 2021-16-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters |
Unsafe Condition
certain parts that are approved for installation on multiple helicopter models are life limited parts when installed on Model MBB-BK 117 D-2 helicopters and some helicopter delivery documents excluded the life limit information
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
determining the total hours time-in-service (TIS) of a certain part-numbered rotor mast nut, re-identifying a certain part-numbered rotor mast nut, establishing a life limit for a certain part-numbered rotor mast nut and helical gear support, removing each part from service before reaching its life limit, replacing a certain part-numbered main gearbox (MGB) with a not affected MGB as specified in a European Aviation Safety Agency (EASA) AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 D-2 helicopters
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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