{"id":"F2006B07970","name":"Airworthiness Directives 2004 - Revocation and Remaking - Pratt and Whitney Canada Turbine Engines - PT6A Series","slug":"airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115018,"registerId":"commonwealth-F2006B07970-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 Canada Turbine Engines - PT6A 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 Canada Turbine Engines - PT6A Series\n\nAD Name AD Number\n\nRotor Components - Service Life - CANCELLED AD/PT6A/1 Amdt 3\n\nRotor Components - Service Life - CANCELLED AD/PT6A/2 Amdt 3\n\nRotor Components - Service Life - CANCELLED AD/PT6A/3 Amdt 1\n\nRotor Components - Service Life - CANCELLED AD/PT6A/4 Amdt 3\n\nLife Limits - Engine Rotating Parts - CANCELLED AD/PT6A/5 Amdt 2\n\nRotor Components - Service Life - CANCELLED AD/PT6A/6 Amdt 4\n\nRe-Routing Of Governor Air Pressure Line AD/PT6A/7\n\nCompressor Rear Hub Hardness AD/PT6A/8\n\nExhaust Duct Reinforcing Ring - CANCELLED AD/PT6A/9\n\nPropeller Reversing Teleflex Control Cable Terminals - CANCELLED AD/PT6A/10\n\nWoodward Primary Propeller Governors and Overspeed Governors - Solenoid AD/PT6A/11\n\nImproved Wire Rope Reversing Cable AD/PT6A/12\n\nFuel Pump Drive Coupling - Improved Lubrication AD/PT6A/13\n\nSungear Coupling Shaft Retaining Rings AD/PT6A/14\n\nReversing Linkage Front End Clevis - Incorporation of Inspection Hole AD/PT6A/15\n\nImproved Strength P.T. Shaft Housing and Reduction Gearbox Condition AD/PT6A/16\n\nImproved Power Turbine Blade Containment - CANCELLED AD/PT6A/17\n\nNo. 2 Bearing Oil Pressure Tube AD/PT6A/18\n\nFuel Control Bypass Valve Diaphragm AD/PT6A/19\n\nNo. 2 Bearing Cover AD/PT6A/20\n\nReplacement of Compressor Delivery Heated Air Tube AD/PT6A/21\n\nFuel Pump Coupling - CANCELLED AD/PT6A/22\n\nReplacement of Compressor Delivery Heated Air Tube by a Non-Metallic Hose AD/PT6A/23\n\nRotor Components - Service Life - CANCELLED AD/PT6A/24 Amdt 1\n\nSundstrand Fuel Pump Drive Wear - CANCELLED AD/PT6A/25\n\nPower Turbine Containment Ring AD/PT6A/26\n\nCompressor Bleed Off Valve AD/PT6A/27\n\nWater Washing AD/PT6A/28\n\nCompressor Bleed Valve - CANCELLED AD/PT6A/29\n\nPropeller Governor Assembly AD/PT6A/30\n\nFuel Control Unit AD/PT6A/31\n\nExhaust Duct Cracking AD/PT6A/32\n\nCompressor Rear Hub - Life Limit Review AD/PT6A/33","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":2,"scope_assessment":{"changed":false,"description":"The scope remains exactly as intended. This is a procedural instrument that re-makes existing airworthiness directives without altering their substance. The document explicitly states that each directive is being re-made \"in exactly the same form as appears in the latest published edition.\" No expansion of regulatory scope has occurred."},"complexity_factors":["Very short document (under 2 pages)","No defined terms section — uses plain language","Simple structure: single operative clause with two sub-paragraphs (revocation and remaking)","Schedule 1 is a straightforward table listing 33 directives by name and number","No conditional logic, exceptions, or cross-references to other legislation beyond the enabling regulation (subregulation 39.001(1))","Administrative in nature — procedural remaking rather than substantive rule-making"],"plain_english_summary":"This CASA order cancels 33 existing Airworthiness Directives for Pratt & Whitney Canada PT6A engines and re-issues each as an individual, standalone legal instrument. It affects PT6A aircraft owners/operators, maintenance organisations, and the manufacturer by clarifying and formalising binding safety requirements. This is an administrative tidy-up — the directives are re-made “in exactly the same form,” with some already-obsolete items formally cancelled."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope not changed: the instrument expressly revokes the listed ADs and remakes each 'in exactly the same form' as the latest published edition (Note). It is an administrative reissuance rather than a substantive amendment to obligations or coverage."},"complexity_factors":["Authority and procedure: action taken under subregulation 39.001(1) (instrument records a delegated administrative power).","Volume of instruments: Schedule 1 lists 33 directives (AD/PT6A/1 through AD/PT6A/33), increasing administrative tracking needs.","Mixed statuses: several listed items are marked 'CANCELLED', requiring users to distinguish which reissued ADs impose current obligations.","Administrative (not substantive) change: each AD is re‑made 'in exactly the same form' as the latest published edition (per the Note), so legal effect is continuity rather than amendment.","Compliance burden: operators and maintenance organisations must locate and comply with multiple separate instruments rather than a single consolidated text.","Attachment dependence: the instrument refers to attached directives; the substantive technical requirements are contained in those attachments (not reproduced here)."],"plain_english_summary":"This instrument cancels the listed Airworthiness Directives for Pratt & Whitney Canada PT6A-series engines and reissues each one as a separate, stand‑alone directive in the same wording as the latest published editions. It affects aircraft owners, operators and maintenance organisations that use PT6A engines because the same inspection, life‑limit and modification requirements continue to apply under newly issued instruments. The action is taken by a CASA delegate under subregulation 39.001(1)."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6a-/documents"}}