AD 2004-06-04
Effective 04/15/2004 · Published 03/31/2004
Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76 A, B, and C Helicopters
Summary
This amendment adopts a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-76 A, B, and C helicopters with dual channel autopilot and dual inverters installed. This action requires a test to determine if the No. 1 inverter is wired to the DC essential bus, and if so, it requires modifying the wiring so that the No. 1 inverter is wired to the No. 2 DC primary bus and the No. 2 inver…