AD 99-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | EC135P1 | Airworthiness Directives; Eurocopter Deutschland GmbH Model EC135 P1 and T1 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | EC135T1 | Airworthiness Directives; Eurocopter Deutschland GmbH Model EC135 P1 and T1 Helicopters |
Unsafe Condition
Crack in the tail boom frame flange at the attachment points of the tail rotor drive shaft bearing support due to metal fatigue from unanticipated loads, which could lead to frame flange fracture, tail rotor drive shaft failure, and loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Before further flight, conduct a dye-penetrant inspection of the frame flange and replace it if cracks are found. Within 7 days, install an additional bearing support bracket on the frame flange. After modification, visually inspect the frame flange for cracks or slippage mark misalignment every 50 flight hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for initial inspection and replacement; within 7 days for bearing support installation; subsequent inspections at intervals not exceeding 50 flight hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter Deutschland GmbH Model EC135 P1 and T1 helicopters, serial numbers 0005 through 0120.
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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