AD/B767/147 - Hydraulic Shutoff Valves (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 CAR 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.

Boeing 767 Series Aeroplanes

AD/B767/147 Hydraulic Shutoff Valves 9/2001

Applicability: All Boeing 767 series aeroplanes equipped with hydraulic shutoff valves manufactured by Circle Seal Controls.

Note 1: Only motor operated hydraulic shutoff valves manufactured by Circle Seal Controls that are installed in the locations specified in applicable alert service bulletin (ASB) are subject to this Directive.

Requirement: 1. Perform an operational check of affected motor operated hydraulic shutoff valves in accordance with Boeing ASB 767-29A0083, Revision 4, dated 28 September 2000.

If any malfunction of the valve is detected, prior to further flight, replace the valve with a new or serviceable Whittaker Controls or Circle Seal Controls valve in accordance with ASB 767-29A0083, Revision 4.

2. Repeat the operational checks for the valves in accordance with ASB 767- 29A0083, Revision 4, until the terminating action required by the Requirement 3 of this Directive is accomplished.

3. Replace the existing Circle Seal Controls valve (identified by Requirement 1), in accordance with ASB 767-29A0090, dated 7 December 2000.