AD 2025-04-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Deutschland GmbH | Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters |
Unsafe Condition
Occurrences of emergency off switches, part of the warning unit, were reported to have mechanical failures, particularly getting stuck in intermediate positions or having an untimely change of status, on Model MBB-BK117 helicopters. The same switches are installed on Model EC135 and EC635 helicopters, and further investigations identified a batch of warning units that might be affected by similar issues.
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Required Actions
Inspecting certain switches on the warning units, and depending on the results, replacing or repairing the warning unit. Installing affected warning units on any helicopter provided the two emergency off switches pass its required check.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Helicopters Deutschland GmbH Model EC135 P1, EC135 P2, EC135 P2+, EC135 P3, EC135 T1, EC135 T2, EC135 T2+, EC135 T3, EC635 P2+, EC635 P3, EC635 T1, EC635 T2+ EC635 T3, MBB-BK117 C-2, MBB-BK117 D-2, MBB-BK117 D-3, and MBB-BK117 D-3m helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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