{"id":"F2006B09561","name":"AD/ENG/5 Amdt 9 - Turbine Engine Continuing Airworthiness Requirements","slug":"ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54215,"registerId":"commonwealth-F2006B09561-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ENG/5 Amdt 8 and issues the following AD under subregulation 39.1 (1) of CASR 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\n![](image.001.png)\n\nEngines \\- General","sortOrder":0},{"sectionNumber":"AD/ENG/5","sectionType":"part","heading":"AD/ENG/5","content":"# AD/ENG/5\n\nAmdt 9\n\n  \n\nTurbine Engine Continuing Airworthiness Requirements\n\n  \n10/2004","sortOrder":1},{"sectionNumber":"REQUIREMENTS","sectionType":"part","heading":"REQUIREMENTS","content":"## REQUIREMENTS\n\nThe PT6A engine maintenance program shall be carried out in accordance with approved maintenance data and detailed in a system of maintenance approved under Civil Aviation Regulation (CAR 1988) 42M. The system of maintenance shall include, but need not be limited to, the following requirements.\n\n    PT6A engines not previously maintained in accordance with a maintenance program reflecting the intent of the maintenance requirements detailed in this Appendix and with engine hours in service greater than 75% of the Pratt and Whitney Canada published Time Between Overhaul (TBO) period at the time of introduction, shall be subject to a pro-rata TBO period based on the Pratt and Whitney Canada published TBO period; and\n\n    2. The engine shall be on an Engine Condition Trend Monitoring (ECTM) program, including data collection, analysis and follow up actions. This program shall be in accordance with the Pratt and Whitney Canada ECTM Users Guide and Reference Manual (PWC P/N 3031900) or WebECTM per PWC SIL PT6A-122 and include requirements for qualification and training for personnel conducting ECTM; and\n\n    3. Hot section inspections shall be carried out at intervals not to exceed:\n\n    (a) 1250 hours time in service; or\n\n    (b) 1760 hours time in service subject to a boroscope inspection of the engine hot section for evidence of cracks, distortion, burning and coating loss at intervals not to exceed 610 hours time in service; and\n\n    4. All fuel nozzles shall be cleaned and flow checked at intervals not to exceed 460 hours time in service; and\n\n    5. The engine oil filter element shall be inspected for contamination at intervals not to exceed 220 hours time in service; and\n\n    6. The reduction gearbox chip detector shall be inspected for contamination, or continuity, at intervals not to exceed 220 hours time in service; and\n\n    7. Engines with an annual utilisation of less than 500 hours per annum, an engine oil change shall be carried out at intervals not to exceed 12 calendar months time in service; and\n\n    8. An inspection of the 1st stage compressor for evidence of Foreign Object damage (FOD), corrosion and contamination shall be carried out at intervals not to exceed 220 hours time in service; and","sortOrder":3}],"analysis":{"summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD remains the current continuing airworthiness standard for PT6A engines, as issued by CASA in Amdt 9. No subsequent amendment or repeal is indicated."},"complexity_factors":["Multiple prescriptive maintenance intervals across two alternative programs","Cross-references to Pratt & Whitney Canada manuals and service information letters","Requirement to operate under an approved maintenance system (CAR 42M)","Transitional provisions for engines with high TBO usage"],"plain_english_summary":"This AD revokes and replaces the prior PT6A directive and sets mandatory continuing-airworthiness requirements for all PT6A engines on Australian‑registered aircraft. Operators must adopt one of two approved maintenance programs (general or agricultural), enroll in engine condition monitoring, and follow the specified inspection/maintenance regime integrated into their approved maintenance system. It permanently mandates how PT6A engines are monitored and maintained, affecting owners, operators and maintainers to ensure safety and regulatory compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements","history":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements/history","analysis":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements/analysis","conflicts":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements/conflicts","importantCases":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements/important-cases","documents":"/api/acts/ad-eng-5-amdt-9-turbine-engine-continuing-airworthiness-requirements/documents"}}