{"id":"F2006B07980","name":"Airworthiness Directives 2004 - Revocation and Remaking - Pratt and Whitney Turbine Engines - PW4000 Series","slug":"airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115028,"registerId":"commonwealth-F2006B07980-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - Pratt and Whitney Turbine Engines - PW4000 Series","content":"Airworthiness Directives 2004\n\nI, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\nAuthority, acting under subregulation 39.001 (1) of the Civil\n\nAviation Safety Regulations 1998:\n\n(a) revoke the Airworthiness Directives mentioned in\n\nSchedule 1; and\n\n(b) make, as separate instruments, each Airworthiness\n\nDirective mentioned in Schedule 1 and attached.\n\n![](image.001.png)\n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority\n\n20 December 2004\n\nNote: Each attached Airworthiness Directive is being re-made in exactly the\n\nsame form as appears in the latest published edition of the Directive.\n\n  \nSchedule 1 Revocation and Remaking of\n\nAirworthiness Directives\n\nPratt and Whitney Turbine Engines - PW4000 Series\n\nAD Name AD Number\n\nThrust Reverser Aft Cascade Support AD/PW4000/1\n\n2nd Stage HPT Rotating Airseal AD/PW4000/2\n\nHPC Surge Margin Improvement - CANCELLED AD/PW4000/3\n\nLow Pressure Turbine Stage 4 Disk AD/PW4000/4\n\nHigh Pressure Compressor Stability Testing - CANCELLED AD/PW4000/5\n\nInspection of Critical Life-limited Rotating Engine Components AD/PW4000/6\n\nLow Pressure Turbine Fourth Stage Airseal AD/PW4000/7 Amdt 1\n\nHigh Surge Rate Engines - CANCELLED AD/PW4000/8\n\nHigh Pressure Compressor Surge - CANCELLED AD/PW4000/9 Amdt 1\n\nEngine Stability Improvements AD/PW4000/10\n\nLCF Items - Mandatory Inspections AD/PW4000/11\n\nHPC Front Drum Rotor - Inspection AD/PW4000/12","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument performs exactly the function described in its title - revocation and remaking of specific airworthiness directives. The scope is narrow and technical, limited to PW4000 engine series maintenance requirements. The note explicitly confirms no substantive change: 'Each attached Airworthiness Directive is being re-made in exactly the same form as appears in the latest published edition of the Directive.'"},"complexity_factors":["Short, single-purpose instrument (2 pages)","No defined terms section - relies on external technical knowledge","Simple binary structure: revoke (a) and remake (b)","Technical content attached as schedules rather than embedded in legislative text","Cross-reference to Civil Aviation Safety Regulations 1998 (subregulation 39.001(1)) for authority","Minimal conditional logic - straightforward administrative remaking"],"plain_english_summary":"This instrument revokes and immediately remakes 12 existing airworthiness directives for Pratt & Whitney PW4000 series engines in unchanged form, preserving their legal force. It's a procedural housekeeping step to prevent these mandatory safety requirements from expiring.\n\nIt affects airlines operating PW4000-equipped aircraft, maintenance organisations, and Pratt & Whitney, ensuring inspections, repairs and life‑limit controls remain legally enforceable and safety-critical work continues uninterrupted."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument restores the listed ADs as separate statutory instruments in the same form as the latest published editions (note). It does not change the substantive obligations or the population covered; the action is administrative reissuance under the delegate's authority (subreg. 39.001(1))."},"complexity_factors":["Procedure is administrative: revocation and re‑making of existing ADs in identical form (note)","Legal basis is a single delegation reference (subregulation 39.001(1))","Schedule 1 lists multiple ADs (11 entries) including several marked CANCELLED","No substantive amendment text in instrument reduces substantive legal complexity","Potential operational complexity for multiple engine operators who must track reissued instruments"],"plain_english_summary":"This instrument revokes the Airworthiness Directives listed in Schedule 1 and re‑makes each as a separate instrument in the same published form (subreg. 39.001(1); note). It covers Pratt & Whitney PW4000‑series engines and applies to aircraft owners, operators and maintenance organisations identified in Schedule 1.\n\nMechanically, obligations remain unchanged: CASA’s delegate decides to revoke and reissue the ADs, and affected parties continue to bear compliance and inspection costs under the reissued directives."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-turbine-engines-pw4000-serie/documents"}}