{"id":"F2006B11031","name":"AD/JT9D/38 - High pressure Turbine Disc - Inspection","slug":"ad-jt9d-38-high-pressure-turbine-disc-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56639,"registerId":"commonwealth-F2006B11031-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\nPratt and Whitney Turbine Engines \\- JT9D Series","sortOrder":0},{"sectionNumber":"AD/JT9D/38 High pressure Turbine Disc - ","sectionType":"part","heading":"AD/JT9D/38 High pressure Turbine Disc - Inspection 10/2002","content":"# AD/JT9D/38 High pressure Turbine Disc \\- Inspection 10/2002\n\nApplicability: Pratt and Whitney JT9D series engines as listed in FAA AD 2001-04-11.\n\nRequirement: Carry out the initial inspection and the repetitive inspections of the first stage high pressure discs per the technical requirements of FAA AD 2001-04-11.\n\nNote: FAA AD 2001-04-11 Amdt 39-12130 refers.\n\nCompliance: Unless previously accomplished, as detailed in the requirement document with a revised effective date of 3 October 2002.\n\nThis Airworthiness Directive becomes effective on 3 October 2002.\n\nBackground: This directive is prompted by the discovery of a crack in the cooling hole of a high pressure turbine disc which could result in uncontained engine failure and damage to the aircraft.\n\n![Signature of James Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 23 August 2002\n\n![](image.001.png)","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":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific safety defect in a specific engine type. It has not expanded beyond its original purpose of mandating inspection for cracked turbine discs."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined term implicitly referenced (FAA AD 2001-04-11)","No nested conditional logic — single straightforward requirement","No cross-references to other Australian legislation beyond the enabling regulation (CAR 1998, subregulation 39.1(1))","Single compliance pathway with one exception clause ('Unless previously accomplished')","Adopts external technical standard by reference rather than reproducing detailed technical specifications"],"plain_english_summary":"This CASA Airworthiness Directive mandates initial and repetitive inspections of Pratt & Whitney JT9D first‑stage high‑pressure turbine discs for cooling‑hole cracks, requiring compliance with FAA AD 2001‑04‑11.\n\nIt affects Australian operators of JT9D‑powered aircraft (e.g., older Boeing 747/767 and Airbus A300/A310), became mandatory 3 October 2002, and aims to prevent uncontained engine failure that could endanger aircraft, crew and passengers."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD incorporates and mandates compliance with FAA AD 2001-04-11 (as revised effective 3 October 2002) for engines listed there. The text does not expand or narrow applicability beyond the FAA AD list and does not indicate any additional measures, so there is no apparent change in scope from the FAA AD as presented."},"complexity_factors":["Cross-reference to an external instrument (FAA AD 2001-04-11) for technical requirements increases reliance on an outside document (Requirement section).","Technical methods and acceptance criteria are not set out in this AD itself; implementers must obtain and follow the FAA AD (Requirement).","Applicability is defined by reference to a list in the FAA AD, so scope depends on that external list (Applicability).","Compliance timing depends on the FAA AD's timelines with a revised effective date (Compliance: effective 3 October 2002).","Regulatory authority and issuance are by CASA under CAR 1998 subreg 39.1(1), which is procedural but central to legal effect (header and signature).","Operational and cost burden is concentrated on operators/maintenance organisations who must schedule inspections and bear costs (implicit in Requirement and Background)."],"plain_english_summary":"Requires operators and maintenance organisations of Pratt & Whitney JT9D-series engines listed in FAA AD 2001-04-11 to perform the initial and recurring inspections of the first-stage high-pressure turbine disc, following the technical steps in FAA AD 2001-04-11 (revised effective 3 October 2002). CASA issued the directive under CAR 1998 subreg 39.1(1) after a crack was found in a disc cooling hole; operators pay inspection and scheduling costs and must alter maintenance practices to reduce the risk of uncontained engine failure and aircraft damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection","history":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection/history","analysis":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection/analysis","conflicts":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection/conflicts","importantCases":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection/important-cases","documents":"/api/acts/ad-jt9d-38-high-pressure-turbine-disc-inspection/documents"}}