{"id":"F2006B10988","name":"AD/JT8D/32 Amdt 1 - High Pressure Compressor Disk - Stages 7-12","slug":"ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56577,"registerId":"commonwealth-F2006B10988-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/32 Amdt 1 - High Pressure Compressor Disk - Stages 7-12","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPratt and Whitney Turbine Engines \\- JT8D Series\n\nAD/JT8D/32\n\nAmdt 1\n\n  \nHigh Pressure Compressor Disk \\- Stages 7-12 3/96\n\nApplicability: All JT8D series engines identified by the serial numbers listed in Pratt and Whitney (P&W) Alert Service Bulletin (ASB) 6226.\n\nNote: The engine listing in P&W ASB 6226 may not be the only engines affected therefore the operator should research their records to establish that all suspect disks overhauled by Turk Hava Yollari (THY) are identified.\n\nRequirement: Visually inspect, and replace if necessary, each suspect 7th through 12th stage High Pressure Compressor (HPC) disk in accordance with the technical requirements of P&W ASB 6226.\n\nNote: FAA AD 95-26-03 also refers. AD 95-26-03 supersedes AD T95-15-51.\n\nCompliance: Effective 29 February 1996; as per the Requirement Document.\n\nBackground: A fatigue crack caused an uncontained HPC disk failure on a JT8D-9A series engine resulting in a fire that destroyed a McDonnell Douglas DC-9-32 aircraft. The FAA determined that the required maintenance practices and procedures as specified by the FAA and Pratt and Whitney may not have been adhered to by the above named overhaul facility.\n\nThis amendment reflects the manufacturers latest requirements; the identification of additional affected engines and the introduction of revised inspection intervals.","sortOrder":0}],"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":true,"description":"The original AD (implied by 'Amdt 1') has expanded beyond its initial scope. This amendment adds 'additional affected engines' and introduces 'revised inspection intervals,' indicating the safety concern grew as more data became available about the THY overhaul facility's work."},"complexity_factors":["Short, single-purpose directive (approximately 250 words)","Only 1 defined term implicitly used (Alert Service Bulletin)","Minimal conditional logic — straightforward applicability and requirement","Single cross-reference to FAA AD 95-26-03 for additional context","No nested exceptions or complex compliance calculations","Technical content is specific but mechanically simple (visual inspection or replace)"],"plain_english_summary":"This CASA Airworthiness Directive mandates visual inspections of high‑pressure compressor disks (stages 7–12) on Pratt & Whitney JT8D engines—especially units overhauled by Turk Hava Yollari and those listed in P&W Alert Service Bulletin 6226—to identify and replace cracked or damaged disks. It follows a fatal fatigue‑crack failure and expands affected engines and inspection timeframes to prevent similar catastrophic accidents."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Yes. The amendment expands scope from the prior directive by reflecting the manufacturer’s latest requirements, identifying additional affected engines and introducing revised inspection intervals, thereby broadening which engines/operators must act and changing maintenance timing and obligations (see 'This amendment reflects the manufacturers latest requirements; the identification of additional affected engines and the introduction of revised inspection intervals')."},"complexity_factors":["Cross-reference to external technical document: Pratt & Whitney ASB 6226 governs the inspection and replacement procedures (operational dependence on manufacturer data).","Record-tracing requirement: operators must research overhaul records to identify engines overhauled by THY (administrative burden, potential gaps in historic records).","Technical judgement: visual inspection and determination of 'suspect' disks require specialist skills and interpretation of ASB criteria (inspection variability).","Inter-jurisdictional alignment: references FAA AD 95-26-03 and superseded ADs (coordination and consistency issues).","Expanded identification: amendment adds additional affected engines and revised inspection intervals (changes to operator planning and maintenance cycles).","Effective compliance timing: compliance is tied to an effective date and the ASB’s timing requirements (scheduling and logistics pressure).","Safety-critical consequences: uncontained failure risk raises stakes for correct implementation and potential grounding or costly replacements."],"plain_english_summary":"This airworthiness directive requires operators of specified Pratt & Whitney JT8D engines to visually inspect 7th–12th stage high-pressure compressor (HPC) disks identified in Pratt & Whitney Alert Service Bulletin (ASB) 6226 and to replace any suspect disks in accordance with that ASB. Operators must research their records to find engines overhauled by Turk Hava Yollari (THY). The action responds to a fatigue-crack-related uncontained disk failure and aligns Australian requirements with the manufacturer’s and FAA directives, placing inspection and replacement costs and compliance burden on operators/overhaul providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12","history":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12/history","analysis":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12/analysis","conflicts":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12/conflicts","importantCases":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12/important-cases","documents":"/api/acts/ad-jt8d-32-amdt-1-high-pressure-compressor-disk-stages-7-12/documents"}}