{"id":"F2006B07971","name":"Airworthiness Directives 2004 - Revocation and Remaking - Pratt and Whitney Canada Turbine Engines - PT6T Series","slug":"airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115019,"registerId":"commonwealth-F2006B07971-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 - PT6T 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 - PT6T Series\n\nAD Name AD Number\n\nLife Limits - Engine Rotating Parts - CANCELLED AD/PT6T/1 Amdt 2\n\nCheck and Regulating Valve Housing Reinforcing Bracket AD/PT6T/2\n\nSundstrand Fuel Pump - CANCELLED AD/PT6T/3\n\nFuel Control Bypass Valve Diaphragm AD/PT6T/4\n\nP3 Air Filter AD/PT6T/5\n\nFuel Pump Coupling - Replacement AD/PT6T/6\n\nGas Generator Case Seam Weld AD/PT6T/7\n\nSundstrand Fuel Pump Drive Wear - CANCELLED AD/PT6T/8\n\nReduced 2nd and 3rd Stage Compressor Disc Lives AD/PT6T/9\n\nCompressor Bleed Off Valve AD/PT6T/10","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No substantive scope change: the instrument revokes the listed AD entries and remakes each AD “in exactly the same form as appears in the latest published edition of the Directive,” so the underlying obligations remain as previously published (instrument note; Schedule 1)."},"complexity_factors":["Procedural, administrative change rather than substantive amendment — revocation and re-making of instruments under subregulation 39.001(1) (instrument text).","Multiple directives listed in Schedule 1 (ten entries, some marked CANCELLED) requiring separate instruments for each AD (Schedule 1).","Technical content not contained in the instrument body but in attached ADs — requires users to open each attached directive to assess specific technical and compliance requirements (instrument text; note).","Delegated decision-making concentrated in a CASA delegate (DAVID ALAN VILLIERS) acting under the cited regulation (instrument header).","Need to cross-reference the ‘latest published edition’ of each directive because the remaking preserves that form, creating reliance on external publication dates/versions (instrument note)."],"plain_english_summary":"This instrument revokes a set of Airworthiness Directives (ADs) relating to Pratt & Whitney PT6T series turbine engines and re-issues each as a separate AD attached to the instrument. It is made by a delegate of the Civil Aviation Safety Authority under subregulation 39.001(1). Operators and maintenance organisations using PT6T engines must consult the attached ADs; each remade AD is preserved “in exactly the same form” as the latest published edition."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument performs exactly the administrative function described in its title — revoking and remaking specific Airworthiness Directives. The scope is narrow and precisely defined, limited to the PT6T engine series and the 10 listed directives. The note explicitly confirms no substantive change to the remade directives."},"complexity_factors":["Very short instrument (under 300 words)","Only 1 defined term implicitly used (subregulation reference)","Simple binary structure: revoke (a) and make (b)","No conditional logic or nested exceptions","Schedule contains straightforward tabular list with only 10 entries","Cross-reference limited to single subregulation citation (39.001(1))","Note provides plain explanation of legal effect"],"plain_english_summary":"This instrument cancels three existing Airworthiness Directives and reissues seven others unchanged for Pratt & Whitney Canada PT6T turbine engines. It affects operators and maintenance organisations using PT6T-powered helicopters and CASA as the regulator.\n\nIt’s mainly housekeeping: legally cancelling obsolete ADs while keeping current requirements identical, so compliance obligations remain the same unless your AD was one of the cancelled ones."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pratt-and-whitney-canada-turbine-engines-pt6t-/documents"}}