{"id":"F2006B11026","name":"AD/JT9D/32 - Combustion Chamber Outer Casing","slug":"ad-jt9d-32-combustion-chamber-outer-casing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56634,"registerId":"commonwealth-F2006B11026-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.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/JT9D/32 Combustion Chamber Outer Casi","sectionType":"part","heading":"AD/JT9D/32 Combustion Chamber Outer Casing 8/2000","content":"# AD/JT9D/32 Combustion Chamber Outer Casing 8/2000\n\nApplicability: Pratt and Whitney JT9D-3A, \\-7, \\-7H, \\-7A, \\-7AH, \\-7F, \\-7J, \\-20 and \\-20J series turbofan engines.\n\nRequirement: Perform on-wing ultrasonic inspections of the Combustion Chamber Outer Casing (CCOC) forward flange (L-flange) fillet radius for cracking in accordance with the Technical Requirements of FAA AD 99-15-02 Amendment 39-11221.\n\nInstallation of a CCOC containing improved L-flange P/N 734515 or 056-1133-1 or installation of CCOC with P/N 758479 or CFL758479 constitutes terminating action to the repetitive inspection of FAA AD 99-15-02.\n\nNote: FAA AD 99-15-02 Amendment 39-11221 refers.\n\nCompliance: Initial and repetitive inspections as specified in the Requirement document with a revised effective date of 10 August 2000.\n\nThis Airworthiness Directive becomes effective on 10 August 2000.\n\nBackground: This Directive raised to mandate a repetitive inspection of the combustion chamber outer casing forward L flange fillet radius for cracking and replacing cracked L flange with serviceable parts. Such cracks could result in an uncontained engine failure and damage to the aircraft.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 28 June 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 July 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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — mandating safety inspections for a specific known defect in specific engine models. It has not expanded beyond this technical safety purpose."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 9 specific engine models listed in applicability section","Single primary requirement with one alternative terminating action","Heavy reliance on external technical document (FAA AD 99-15-02) for actual inspection procedures — the Australian AD does not reproduce these details","Minimal defined terms (only standard aviation abbreviations like CCOC, P/N, L-flange)","No nested exceptions or conditional logic beyond the terminating action provision","Clear, linear structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This CASA Airworthiness Directive mandates repeated ultrasonic inspections of the combustion‑chamber outer‑casing forward flange on Pratt & Whitney JT9D (listed -3A through -20J series) engines, requiring replacement of any cracked parts. It affects operators of affected wide‑body aircraft, makes the FAA‑issued inspection schedule legally mandatory in Australia, and can be satisfied permanently by fitting specified redesigned parts to prevent potentially uncontained engine failures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD adopts and mandates the inspection requirements of FAA AD 99-15-02 for the listed JT9D engine variants and adds an Australian effective date (10 August 2000). It does not expand the technical scope beyond the FAA action; compliance is limited to inspections and replacement/installation of specified CCOC part numbers as terminating action."},"complexity_factors":["Cross-reference to external FAA AD 99-15-02 for technical requirements and inspection intervals","Technical inspection method (on‑wing ultrasonic) requires specialised equipment and personnel","Multiple engine model applicability (several JT9D variants) increases operational coverage","Terminating action depends on installation of specific part numbers (P/N 734515, 056-1133-1, 758479, CFL758479)","Compliance timing and repetition set by the referenced FAA document rather than fully within the AD text","Regulatory authority exercised by CASA delegate under CAR 1998 subregulation 39.1(1)"],"plain_english_summary":"**What it does:** This AD requires operators of Pratt & Whitney JT9D-3A, -7 and related series engines to perform on‑wing ultrasonic inspections of the combustion chamber outer casing forward L‑flange fillet radius for cracking; installing specified improved CCOC part numbers terminates the repetitive inspections.\n\nOperators pay for inspections and any replacements; the CASA delegate issued the directive and set an effective date of 10 August 2000. The action implements FAA AD 99‑15‑02 (Requirement; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing","history":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing/history","analysis":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing/analysis","conflicts":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing/conflicts","importantCases":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing/important-cases","documents":"/api/acts/ad-jt9d-32-combustion-chamber-outer-casing/documents"}}