{"id":"F2006B06393","name":"AD/PW4000/12 - HPC Front Drum Rotor - Inspection","slug":"ad-pw4000-12-hpc-front-drum-rotor-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47700,"registerId":"commonwealth-F2006B06393-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PW4000/12 - HPC Front Drum Rotor - Inspection","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)  \n\nAIRWORTHINESS 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 revokes Airworthiness Directive (AD) AD/PW4000/12 and issues the following 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 \\- PW 4000 Series\n\nAD/PW4000/12\n\nAmdt 1\n\n  \nHPC Front Drum Rotor \\- Inspection 10/2002\n\nApplicability: Pratt and Whitney PW4000 engines as specified by models in FAA AD 2002-12-15.\n\nRequirement: Carry out the initial inspection and repetitive inspections in accordance with the requirements of FAA AD 2002-12-15.\n\nNote: FAA AD 2002-12-15, Amdt 39-12787 refers which supersedes FAA AD 2001- 20-13 Amdt 39-12461.\n\nCompliance: Unless already accomplished, as detailed in the requirement document with a revised effective date of 3 October 2002.\n\nThis Amend ment becomes effective on 3 October 2002.\n\nBackground: FAA reports 11 instances of cracking of the HPC drum rotors that could result in uncontained failures. This AD introduces an inspection regime that can detect the cracking before failure.\n\nOriginal issue of this AD was based on FAA AD 2001-20-13 and became effective on 11 July 2002.\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)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 September 2002.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment does not broaden or narrow the operative requirement: it revokes the earlier AD and reissues the inspection requirement to align with FAA AD 2002-12-15 (superseding FAA AD 2001-20-13) and sets a revised effective date of 3 October 2002. Applicability and mandatory inspection regime remain those specified in the referenced FAA AD (Applicability; Requirement; Note; Compliance; Background)."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2002-12-15) — operators must read and follow that document rather than only the CASA AD (Requirement).","Technical nature of inspections (HPC front drum rotor cracking) requires specialist procedures, equipment and qualified personnel (Background; Requirement).","Applicability is defined by engine models listed in the FAA AD rather than spelled out in this AD, adding a layer of traceability complexity (Applicability; Requirement).","Compliance timing is tied to a revised effective date and prior AD history (original AD, amendment, and superseded FAA AD references), requiring operators to track versions (Compliance; Note; Background).","Operator responsibility for recurring inspections and potential repairs creates ongoing operational and cost burdens (Requirement; Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Pratt & Whitney PW4000 engines to carry out the initial and recurring inspections of the high‑pressure compressor (HPC) front drum rotor exactly as set out in FAA AD 2002‑12‑15, with a revised effective date of 3 October 2002. CASA (by delegate) enforces the requirement; operators pay for and must schedule the inspections and any repairs. The inspections are intended to detect rotor cracking that could lead to uncontained failures (Background; Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive amendment. The scope remains precisely targeted at addressing the specific safety defect (HPC drum rotor cracking) in the specified engine series. The amendment simply updates the reference to the latest FAA directive and revises the effective date, without expanding beyond the original safety purpose."},"complexity_factors":["Very short document (1 page)","Only 4 defined structural sections (Applicability, Requirement, Compliance, Background)","Single cross-reference to external FAA directive (FAA AD 2002-12-15)","No nested conditions or exceptions — straightforward mandatory action","Minimal defined terms (only 'HPC' — High Pressure Compressor — implied by context)"],"plain_english_summary":"The Civil Aviation Safety Authority requires operators of Pratt & Whitney PW4000 engines (used on large jets) to inspect and repeatedly re‑inspect the high‑pressure compressor (HPC) front drum rotor for cracking, following FAA AD 2002‑12‑15. Triggered by multiple crack findings that could cause uncontained engine failure, the order (effective 3 October 2002 or immediately if not done) updates and replaces an earlier directive to prevent catastrophic in‑flight engine breakup."},"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-pw4000-12-hpc-front-drum-rotor-inspection","history":"/api/acts/ad-pw4000-12-hpc-front-drum-rotor-inspection/history","analysis":"/api/acts/ad-pw4000-12-hpc-front-drum-rotor-inspection/analysis","conflicts":"/api/acts/ad-pw4000-12-hpc-front-drum-rotor-inspection/conflicts","importantCases":"/api/acts/ad-pw4000-12-hpc-front-drum-rotor-inspection/important-cases","documents":"/api/acts/ad-pw4000-12-hpc-front-drum-rotor-inspection/documents"}}