Commonwealth legislation

AD/B737/160 - Hydraulic Shutoff Valves

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This AD requires aircraft operators to perform recurring operational checks of certain motor‑operated hydraulic shutoff valves made by Circle Seal Controls on Boeing 737 series and to replace any valve that malfunctions, following specific Boeing Alert Service Bulletins. It applies to 737‑100 through ‑800 aircraft fitted with those valves. The stated purpose is to correct an identified unsafe valve condition; operators pay for inspections and any replacements and must ground an aircraft with a detected malfunction until a serviceable valve is fitted.

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AIRWORTHINESS DIRECTIVE

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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.

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Boeing 737 Series Aeroplanes

AD/B737/160 Hydraulic Shutoff Valves 9/2

AD/B737/160 Hydraulic Shutoff Valves 9/2001

Applicability: All Boeing 737-100, -200, -300, -400, -500, -600, -700, -800 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 737-29A1073, Revision 3, dated 2 December 1999 or ASB 737-29A1081, dated 2 December 1999, as applicable.

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 737-29A1073, Revision 3 or ASB 737-29A1081, as applicable.

2. Repeat the operational checks for the valves in accordance with ASB 737- 29A1073, Revision 3 or ASB 737-29A1081, as applicable, 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 737-29A1078, dated 7 December 2000 or ASB 737- 29A1082, dated 7 December 2000, as applicable.

Note 2: FAA AD 2001-11-07 Amendment 39-12249 refers.

Note 3: Operational checks done before the effective date of this Directive as per Boeing ASB 737-29A1073, Revision 2, dated 1 July 1999 meet Requirements 1 and 2 of this Directive.

Note 4: Replacement of Circle Seal Controls valve done before the effective date of this Directive as per Boeing ASB 737-29A1073, Revision 2, dated 1 July 1999, meets the Requirement 3 of this Directive.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Boeing 737 Series Aeroplanes

AD/B737/160 Hydraulic Shutoff Valves 9/2 AD/B737/160 Hydraulic Shutoff Valves 9/2001

AD/B737/160 Hydraulic Shutoff Valves 9/2001

Applicability: All Boeing 737-100, -200, -300, -400, -500, -600, -700, -800 series aeroplanes equipped with hydraulic shutoff valves manufactured by Circle Seal Controls.

2. Repeat the operational checks for the valves in accordance with ASB 737- 29A1073, Revision 3 or ASB 737-29A1081, as applicable, 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 737-29A1078, dated 7 December 2000 or ASB 737- 29A1082, dated 7 December 2000, as applicable.

Note 2: FAA AD 2001-11-07 Amendment 39-12249 refers.

Note 3: Operational checks done before the effective date of this Directive as per Boeing ASB 737-29A1073, Revision 2, dated 1 July 1999 meet Requirements 1 and 2 of this Directive.