AD 2012-10-53
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GmbH | Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters |
Unsafe Condition
Cracking on the lower hub-shaft flanges of EC135 model helicopters, which if not corrected could result in failure of the main rotor hub (MRH) 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
Before further flight, and thereafter at intervals not to exceed 6 hours time-in-service (TIS), check the lower MRH shaft flange and the visible area of the upper MRH shaft flange for a crack. For an MRH shaft with 400 or more hours TIS, within 10 hours TIS, and thereafter at intervals not to exceed 10 hours TIS, remove the rotor-hub cap, inspect the upper and lower hub-shaft flanges for a crack, remove the blade attachment bolt safety pins, nut, and washer, and inspect the lower hub-shaft flange bolt attachment areas for a crack. If a crack is found, replace the MRH shaft.
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
Eurocopter Deutschland GmbH Model EC135 P1, EC135 P2, EC135 P2+, EC135 T1, EC135 T2, and EC135 T2+ 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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