{"id":"F2006B07719","name":"Airworthiness Directives 2004 - Revocation and Remaking - AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series","slug":"airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50451,"registerId":"commonwealth-F2006B07719-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 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\nAlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series\n\nAD Name AD Number\n\nRotating Components - Service Life Limits - CANCELLED AD/ALF/1\n\nTime Limits - Components Service Life Limits - CANCELLED AD/ALF/2 Amdt 4\n\nCompressor Housing Support Assembly 2-103-070-07 - Inspection and AD/ALF/3\n\nCompressor Vanes, Turbine Blades and Turbine Nozzle - Inspection and AD/ALF/4\n\nFourth Stage Turbine Rotors Assembly P/N 2-141-170-23 and -27 - AD/ALF/5\n\nReplacement of Fuel By-Pass Valve In Dual Heat Exchanger AD/ALF/6\n\nOil System Debris Management AD/ALF/7\n\nIntroduction of Turbine Spacers P/N 2-121-071-31/35 AD/ALF/8 Amdt 1\n\nThird Stage Turbine Rotor Assembly AD/ALF/9 Amdt 1\n\nThird Stage Turbine Rotor Assembly AD/ALF/10\n\nThird Stage Compressor Disc AD/ALF/11 Amdt 1\n\nIntroduction of Improved Third Stage Turbine Rotor Assembly AD/ALF/12\n\nThird Stage Compressor Disc Inspection AD/ALF/13\n\nEngine Oil System Health Monitoring AD/ALF/14 Amdt 3\n\nFuel Manifold Inspections AD/ALF/15\n\nFan Core Inlet Anti-Ice System AD/ALF/16 Amdt 1\n\nNo. 4 and 5 Duplex Bearing Assembly AD/ALF/17\n\nTurbine Component Life Limits AD/ALF/18\n\nCombustion Liner - Inspection AD/ALF/19\n\nFlow Divider Fuel Tube - Inspection AD/ALF/20","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope not changed. The instrument expressly revokes the listed Airworthiness Directives and remakes each in exactly the same form, so existing obligations and affected parties remain the same (see Schedule 1 and the note that each AD is re‑made in identical form)."},"complexity_factors":["Administrative action only: revocation and re‑making of ADs in identical form limits substantive legal change.","Number of directives affected: 20 ADs listed in Schedule 1 requires tracking and administrative implementation by operators and regulators.","Legal basis: exercise of delegated power under subregulation 39.001(1) concentrates decision‑making in a CASA delegate.","Compliance burden resides with operators/maintenance organisations because each AD (e.g. inspections, life limits, part replacements) imposes technical obligations even though details are unchanged.","Document structure: schedule and attached separate instruments create cross‑references and record‑keeping requirements for regulatory and operational compliance."],"plain_english_summary":"This instrument, signed by a Civil Aviation Safety Authority delegate under subregulation 39.001(1), revokes a package of Airworthiness Directives for AlliedSignal (Lycoming) ALF502 and LF507 turbine engines and remakes each as a separate directive in the same form. It affects aircraft operators, maintenance organisations and parts suppliers who must follow the listed directives. Mechanically, the delegate replaces the cancelled instruments with identically worded separate ADs; the CASA delegate decides, and operators/maintainers bear the compliance costs of inspections, limits or parts actions required by those ADs."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument performs a pure administrative remaking of existing Airworthiness Directives. The scope is identical to the original ADs — the note explicitly states each AD is being re-made 'in exactly the same form as appears in the latest published edition of the Directive'. There is no expansion, contraction, or modification of regulatory scope."},"complexity_factors":["Single, clear administrative action (revocation and remaking) with straightforward structure","No defined terms section — all terminology is standard aviation industry language","No conditional logic or nested exceptions — the instrument operates unconditionally on the listed ADs","Cross-references limited to: (a) subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (the enabling power), and (b) Schedule 1 which simply lists the 20 ADs","Substantive technical content is contained in attached documents (the ADs themselves) rather than this instrument — this is purely a 'wrapper' instrument","Extremely short — approximately 300 words excluding the schedule table"],"plain_english_summary":"This instrument revokes and immediately remakes twenty existing Airworthiness Directives for AlliedSignal (Lycoming) ALF502 and LF507 turbine engines, reproducing them identically. It is an administrative \"revoke and remake\" action—no technical or safety requirements are changed.\n\nIt affects engine owners and operators, maintenance organisations, and CASA by preserving the legally binding inspection, replacement and life‑limit obligations under the current regulatory framework."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-alliedsignal-lycoming-turbine-engines-alf502-a/documents"}}