AD/S-92/6 - Main Gearbox Filter Bowl Assembly Mounting Studs (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-92 Series Helicopters AD/S-92/6 Main Gearbox Filter Bowl 5/2009 TX Assembly Mounting Studs

Applicability: Sikorsky Aircraft Corporation S-92A helicopters with a main gearbox assembly, part number (P/N) 92351-15110-042, -043, or -044, that is not marked with "TS-062-01" near the P/N.

Requirement: 1. Remove the titanium studs by following the accomplishment instructions in Sikorsky Alert Service Bulletin (ASB) No. 92-63-014, Rev A dated 20 March 2009 paragraph 3.A.

2. Visually inspect the tapped holes and the main gearbox housing lockring counterbore for damage.

Note 1: Figure 1 of the ASB contains guidance for removal and installation of the studs.

3. Install steel studs and mark the main gearbox housing as "TS-062-01" near the P/N by following the accomplishment instructions of Sikorsky ASB No. 92-63-014 Rev A paragraph 3.C.

Note 2: FAA Emergency AD 2009-07-053 dated 23 March 2009 refers.

Compliance: Before further flight after the effective date of this AD unless previously accomplished.