Commonwealth legislation

AD/IAI-W/26 - Oxygen Shut-off Valve

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legislative instrument

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This Airworthiness Directive requires owners/operators of Israel Aircraft Industries models 1123, 1124 and 1124A to remove the existing oxygen shut-off valve and install a Scott slow‑opening valve (P/N 27550‑3) per the applicable IAI Alert Service Bulletin, within 200 hours time in service of the effective date (23 Jan 2003). CASA issued the AD under CAR 1998 subregulation 39.1(1) to address a fire risk from rapid valve opening. Operators pay for and schedule the mechanical replacement according to the ASB instructions.

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AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
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.

Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes

AD/IAI-W/26 Oxygen Shut-off Valve 1/2003

Applicability: Model 1123, 1124 and 1124A series aeroplanes.

Requirement: Remove the existing oxygen shut-off valve and replace it with a Scott® slow opening valve having part number 27550-3 in accordance with Israel Aircraft Industries Alert Service Bulletin (ASB) 1123-35-048 or ASB 1124-35-137 both dated 23 September 2002, as applicable.

Note: Israel CAA AD 35-02-10-12 refers.

Compliance: Within 200 hours time in service after the effective date of this Directive.

This Airworthiness Directive becomes effective on 23 January 2003.

Background: The oxygen system of the Astra is designed so that high oxygen pressure is maintained from the cylinder to the pressure reducer-regulator located downstream of the shut-off valve. If this valve is quickly opened, overheating and subsequent fire may occur due to rapid adiabatic compression.

This Directive requires the replacement of the existing oxygen shut-off valve with a slow opening valve.

Signature of James Coyne

James Coyne

Delegate of the Civil Aviation Safe ty Authority 25 November 2002

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 18 December 2002.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

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.

Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes