AD 2011-21-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GmbH (ECD) Model MBB-BK 117 C-2 | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 C-2 Helicopters |
Unsafe Condition
Reports of too high a current flow when one generator is deactivated, which could lead to failure of the remaining generator, loss of electrical power, and loss of systems necessary for flight safety.
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Required Actions
Revise the Rotorcraft Flight Manual (RFM) by inserting temporary pages 7, 8, and 11 from Alert Service Bulletin ASB MBB BK117 C-2-24A-008 into the Emergency Procedures and Performance Data sections. The revisions alert operators to visually monitor the power display GEN AMPS on the VEMD for too high a current flow when a generator is deactivated and provide instructions to switch off the two BUS TIEs on the overhead panel to prevent generator damage.
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Compliance Time
Before further flight
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Affected Aircraft
Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 C-2 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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