AD 2010-05-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Eurocopter France (ECF) Model EC120B Helicopters |
Unsafe Condition
Failure of the main rotor head rotor hub (rotor hub) in the attachment area of one of the three drag damper fittings, leading to excessive vibrations and potential loss of a main rotor blade.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the rotor hub for cracks at specified intervals. If scoring, paint flaking, or identification plate adhesive is found, sand the area until the primer coat is visible and inspect for cracks. Replace the rotor hub with an airworthy one if a crack is found before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 15 hours time-in-service (TIS) for initial inspection. Before further flight if a crack is found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France (ECF) Model EC120B helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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