AD/S-76/75 - Main Rotor Shaft - 2 (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 39.001(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-76/75 Main Rotor Shaft - 2 8/2007 DM

Applicability: Model S-76A, B, and C helicopters equipped with a main rotor shaft assembly listed below:

a. Part number 76351-09030-all dash numbers, and with a following serial number:

B015-00782 through B015-00791, B015-00811 through B015-00816, E015-00844 through E015-00865, and E015-00908 through E015-00918.

b. Part number 76351-09630-041, and with a following serial number:

C213-00436 through C213-00454, D213-00537 through D213-00545, and D213-00575 through D213-00585. Requirement: Perform an ultrasonic inspection of the main rotor shaft assembly for cracking:

1. For Model S-76A, B, and C helicopters equipped with a main rotor shaft assembly part number 76351-09630-041, remove and inspect the shaft assembly in accordance with the Accomplishment Instructions, paragraphs 3.B.(1)(a) through 3.B.(1)(d)5 of Sikorsky Alert Service Bulletin (ASB) No. 76-66-45A Revision A, dated 7 February 2007, or later FAA approved revision.