Superseded. This AD was superseded by AD 2020-02-11. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2015-04-04
Effective 03/11/2015 · Published 02/24/2015
Airworthiness Directives; Bell Helicopter Textron Inc. Helicopters
Summary
We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Inc. (Bell) Model 412 and 412EP helicopters with certain static inverters (inverters) installed. This AD requires revising the Rotorcraft Flight Manual (RFM) and installing a placard in full view of the pilot to limit flight to visual flight rules (VFR) only and prohibit night operations. This AD is prompted by failures of certain inverte…