{"id":"F2006B10444","name":"AD/HS 125/162 - Turbine Air Discharge Duct","slug":"ad-hs-125-162-turbine-air-discharge-duct","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116151,"registerId":"commonwealth-F2006B10444-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/HS 125/162 Turbine Air Discharge Duct","sectionType":"part","heading":"AD/HS 125/162 Turbine Air Discharge Duct 7/2000","content":"# AD/HS 125/162 Turbine Air Discharge Duct 7/2000\n\nApplicability: All model BAe 125 series 1000A, 1000B and model Hawker 1000 series aircraft.\n\nRequirement: 1. Perform a general visual inspection of the turbine air discharge duct in accordance with Accomplishment Instructions Part I of Raytheon Service Bulletin SB 21-3108 dated November 1998.\n\n2. Carry out a detailed inspection of the turbine air discharge duct in accordance with Accomplishment Instructions Part II of Raytheon Service Bulletin SB 21-3108 dated November 1998.\n\nNote: FAA AD 2000-01-02 Amendment 39-11499 refers.\n\nCompliance: 1. Within 25 hours time in service after the effective date of this Directive.\n\n2. Within 300 flight hours or 6 months time in service, whichever occurs first, after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 13 July 2000.\n\nBackground: Separation of the cold air discharge duct and/or water separator have occurred and resulted in an in-flight cabin de-pressurisation.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 31 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.","sortOrder":1}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies to all BAe 125 series 1000A, 1000B and Hawker 1000 aircraft and mandates two inspections per the Raytheon Service Bulletin within the stated times. The text contains no amendments or expanded applicability; it implements inspections to address the stated unsafe condition without changing the original applicability or requirements."},"complexity_factors":["Cross-reference to an external manufacturer Service Bulletin (Raytheon SB 21-3108) for inspection procedures increases reliance on non-statutory documents.","Reference to FAA AD 2000-01-02 adds an external regulatory linkage to interpretive context.","Two different inspection standards/timelines (general visual within 25 hours; detailed within 300 flight hours or 6 months) create staged compliance planning.","Applicability limited to specific aircraft models requires operators to determine fleet coverage precisely.","Technical nature of 'detailed inspection' requires qualified maintenance personnel and workshop time.","Operational disruption risk from grounding/time-in-service constraints and required maintenance windows.","Record-keeping and demonstration of compliance to CASA are implicit compliance burdens."],"plain_english_summary":"Requires operators of BAe 125 series 1000A/1000B and Hawker 1000 aircraft to inspect the turbine air discharge duct per Raytheon Service Bulletin SB 21-3108: a general visual inspection within 25 hours time-in-service and a detailed inspection within 300 flight hours or six months. The Directive responds to instances where the duct or water separator separated and caused in‑flight cabin decompression. Operators are responsible for carrying out and funding the inspections and must follow the specified accomplishment instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in specific aircraft models. Airworthiness Directives are inherently limited-purpose instruments by design, and this one has not expanded beyond its original safety intent."},"complexity_factors":["Single, clearly defined applicability (three specific aircraft models)","Only two straightforward compliance requirements with clear timeframes","References one external technical document (Raytheon Service Bulletin) but does not incorporate complex conditional logic","No defined terms section, no nested exceptions, no cross-references to other legislation beyond a note about the corresponding FAA AD","Total length: approximately 250 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of BAe 125 Series 1000A/1000B and Hawker 1000 jets to inspect the turbine air discharge duct per a Raytheon service bulletin. It mandates prompt checks to detect cracking or separation after reports of the duct detaching in flight and causing cabin depressurisation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct","history":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct/history","analysis":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct/analysis","conflicts":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct/conflicts","importantCases":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct/important-cases","documents":"/api/acts/ad-hs-125-162-turbine-air-discharge-duct/documents"}}