{"id":"F2006B10772","name":"AD/IAI-A/15 - Oxygen Shut-off Valve","slug":"ad-iai-a-15-oxygen-shut-off-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56223,"registerId":"commonwealth-F2006B10772-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor 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.\n\nIsrael Aircraft Industries 1125 (Astra) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/IAI-A/15 Oxygen Shut-off Valve 11/200","sectionType":"part","heading":"AD/IAI-A/15 Oxygen Shut-off Valve 11/2002","content":"# AD/IAI-A/15 Oxygen Shut-off Valve 11/2002\n\nApplicability: 1125 Astra aeroplanes, with serial numbers (S/N) 004 to 072 and 074 to 078 inclusive, and Astra SPX aeroplanes, with S/N 073 and 079 to 131 inclusive.\n\nRequirement: Remove the existing oxygen shut-off valve and replace it with a Scott® slow opening valve having part number 27550-3 in accordance with Astra Alert Service Bulletin 1125-35A-114 dated 28 November 2001.\n\nNote: Israel CAA AD 35-02-07-02 refers.\n\nCompliance: Within 200 hours time in service after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 31 October 2002.\n\nBackground: 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.\n\nThis Directive requires the replacement of the existing oxygen shut-off valve with a slow opening valve.\n\n![](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 13 September 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 9 October 2002.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating a valve replacement to prevent oxygen system fires."},"complexity_factors":["Single, specific mechanical action required (valve replacement)","Limited applicability (defined by specific serial number ranges)","One compliance timeframe (200 hours time in service)","No nested exceptions or conditional logic","Cross-reference to only one external technical document (service bulletin) and one foreign aviation directive","No defined terms section"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Israel Aircraft Industries Astra and Astra SPX business jets to replace the oxygen shut-off valve with a slow-opening Scott® part 27550-3, using Astra Alert Service Bulletin 1125-35A-114. The change, to be completed within 200 flight hours after 31 Oct 2002, removes a fire risk from rapid oxygen compression (adiabatic heating) in affected serial-numbered aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements a targeted corrective action for a defined set of aircraft serial numbers by mandating replacement of the shut‑off valve with a specified part and compliance timeframe. It does not broaden or narrow applicability beyond that stated in the instrument."},"complexity_factors":["Narrow applicability limited to specific aircraft serial numbers (Astra and Astra SPX)","Single, well‑specified technical action: replace valve with part 27550‑3 per a named service bulletin","Clear, short compliance period: within 200 hours time in service","Low regulatory discretion—mandatory AD issued under CAR subregulation 39.1(1)","Operational burdens on operators: sourcing specified part, scheduling maintenance and downtime, and bearing replacement costs","Cross‑reference to Israel CAA AD and reliance on manufacturer service bulletin for procedural detail","Safety rationale tied to a single mechanical failure mode (adiabatic compression leading to overheating/fire)"],"plain_english_summary":"This Airworthiness Directive requires operators of specified Israel Aircraft Industries Astra and Astra SPX aeroplanes (particular serial numbers) to remove the existing oxygen shut‑off valve and fit a Scott slow‑opening valve (part number 27550‑3) in accordance with Astra Alert Service Bulletin 1125‑35A‑114. CASA set a compliance window of 200 flight hours from the AD’s effective date (31 Oct 2002). Operators pay for the parts and maintenance time; the measure aims to prevent overheating and fire caused by rapid valve opening."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve","history":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve/history","analysis":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve/analysis","conflicts":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve/conflicts","importantCases":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve/important-cases","documents":"/api/acts/ad-iai-a-15-oxygen-shut-off-valve/documents"}}