AD/S-76/73 - Dual Inverter Wiring (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Sikorsky S-76 Series Helicopters

AD/S-76/73 Dual Inverter Wiring 6/2004 DM

Applicability: Model S-76 A, B and C helicopters with dual channel autopilot and dual inverters installed.

Note 1: Helicopters with the following serial numbers were manufactured with the dual channel autopilot and dual inverters installed:

S-76 A

760267 760300 through 760302 760366 760268 760304 through 760309 760369 through 760371 760270 through 760298 760364 760373 through 760378 S-76 B 760262 760393 762976 (760433) 760269 760395 760437 760299 760399 760439 760303 760403 760441 through 760445 760310 through 760363 760404 760447 through 760452 760365 760409 760454 760367 760410 760455 760368 760413 760458 760372 760414 760462 760379 through 760382 760416 760465 760387 760425 760507 760391 760427 through 760430 S-76 C 760383 through 760386 760415 760453 760388 through 760390 760417 through 760424 760456 760392 760426 760457 760394 760431 760459 through 760461 760396 through 760398 760432 760463 760400 through 760402 760434 through 760436 760464 760405 through 760408 760438 760466 through 760506 760411 760440 760508 through 760526 760412 760446