AD 2015-04-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Helicopters |
| aircraft | Bell | Helicopter Textron Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Helicopters |
Unsafe Condition
Failure of an inverter(s) under instrument meteorological conditions or night flight, which could result in smoke in the cockpit, increased pilot workload due to the loss of primary flight and navigation displays, alternating current powered engine and transmission indicators, and autopilot, and subsequent loss of control of the helicopter.
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Required Actions
Within 5 hours time-in-service, revise the Limitations section of the Rotorcraft Flight Manual (RFM) to limit operations to Visual Flight Rules (VFR) and prohibit night operations. Install a placard in full view of the pilots to reinforce these restrictions.
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Compliance Time
Within 5 hours time-in-service
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Affected Aircraft
Bell Helicopter Textron Inc. Model 412 and 412EP helicopters with a static inverter part number (P/N) 412-375-079-101 or 412-375-079-103 with a serial number 29145 or larger installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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