{"id":"F2006B07717","name":"Airworthiness Directives 2004 - Revocation and Remaking - AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 Series","slug":"f2006b07717","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":333175,"registerId":"commonwealth-F2006B07717-current","compilationNumber":null,"startDate":"2026-04-08","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - AlliedSignal (Garrett/AiResearch) Turbine Engines - TFE731 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 (Garrett/AiResearch) Turbine Engines - TFE 731 Series\n\nAD Name AD Number\n\nLife Limited Components - CANCELLED AD/TFE 731/1 Amdt 5\n\nFuel Pump Anti-Icing Valve - Inspection AD/TFE 731/2\n\nH.P. Turbine Blade P/N 3072111-1 - Replacement AD/TFE 731/3 Amdt 1\n\nTransfer Bearing Support - Inspection AD/TFE 731/4\n\nCompressor Tie Rod - Replacement AD/TFE 731/5\n\nHigh Pressure Rotor and Nozzle Assembly Bolt - Replacement AD/TFE 731/6\n\nTurbine Interstage Transition Duct AD/TFE 731/7 Amdt 2\n\nSecond Stage Turbine Disc Inspection AD/TFE 731/8\n\nL.P. Turbine Blade - Review, Inspection and Replacement AD/TFE 731/9\n\nNo. 1 Bearing - Replacement AD/TFE 731/10\n\nH.P. Turbine Blades P/N 3072455-10 Replacement AD/TFE 731/11\n\nFan Rotor Assembly - CANCELLED AD/TFE 731/12 Amdt 5\n\nTurbine Interstage Transition Duct Re-Inspection AD/TFE 731/13\n\nFirst Stage L.P. Turbine Disc AD/TFE 731/14\n\nHP Turbine Rotor Disc AD/TFE 731/15\n\nHP Turbine Rotor Disc P/N 3072316-2/-3 and P/N 3073110-1/-2 AD/TFE 731/16\n\nL.P. Turbine Third Stage Rotor Disc AD/TFE 731/17\n\nDigital Electronic Engine Control AD/TFE 731/18\n\nFan Rotor Disc Inspection - CANCELLED AD/TFE 731/19 Amdt 2\n\nFirst Stage Low Pressure Turbine Nozzle Airseal - CANCELLED AD/TFE 731/20\n\nFan Disc Dovetail Slot - CANCELLED AD/TFE 731/21 Amdt 1\n\nLow Pressure Turbine Third Stage Disc Material Anomalies AD/TFE 731/22\n\nFuel Line Clamp - CANCELLED AD/TFE 731/23\n\nFirst and Second Stage Low Pressure Turbine Discs AD/TFE 731/24\n\nLow Pressure Turbine Nozzle A5 Airseal AD/TFE 731/25\n\nLow Pressure Turbine First and Second Stage Disc Suspect Material Properties AD/TFE 731/26\n\nP/N 3072816 Fan Disc Life Reduction - CANCELLED AD/TFE 731/27\n\nP/N 3072816 Fan Disc Inspection - CANCELLED AD/TFE 731/28\n\nFan Disc Life Reduction - CANCELLED AD/TFE 731/29\n\nRe-Inspect Fan Disc - CANCELLED AD/TFE 731/30\n\nHP Compressor Impeller AD/TFE 731/31\n\nFan Rotor Disc AD/TFE 731/32","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"No substantive change in regulatory scope. The delegate revoked the listed ADs and re-made them in exactly the same form as the latest published editions (per the instrument's note), so affected parties' substantive obligations remain as previously required; this is an administrative re-issuance under subregulation 39.001(1)."},"complexity_factors":["Administrative action affecting a large set of technical ADs listed in Schedule 1 (multiple engine components and inspections).","Delegated decision-making under subregulation 39.001(1) requires checking regulatory authority and formal instrument validity.","Technical compliance obligations remain in separate, substantive AD instruments that operators must locate and follow (operational complexity for maintainers).","Some entries are marked CANCELLED, creating a need to reconcile current applicability across instruments.","Note states re-made ADs are identical to the latest published editions, so legal effect is administrative re-issuance rather than substantive amendment.","Potential compliance cost and operational disruption borne by aircraft operators and maintenance organisations (inspections, replacements)."],"plain_english_summary":"This instrument, made by a CASA delegate under subregulation 39.001(1), revokes the Airworthiness Directives listed in Schedule 1 and re-issues each as a separate instrument.  \n\nIt affects operators, owners and maintenance organisations of AlliedSignal TFE731-series engines, who must continue to comply with the re-made ADs (noted as identical to the latest published editions); compliance costs (inspections, part replacements) fall on those operators."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument maintains the exact same scope as the original ADs. The note explicitly states each directive is being re-made 'in exactly the same form' — this is purely a procedural reclassification of existing requirements under a different regulatory power (subregulation 39.001(1) of CASR 1998), not an expansion of regulatory scope."},"complexity_factors":["Single operative provision with straightforward (a)/(b) structure","No defined terms section — relies on external knowledge of aviation terminology (AD, TFE731, P/N)","Heavy reliance on Schedule 1 table for substantive content","Cross-references to 32 separate attached instruments not reproduced in full","Assumes technical familiarity with aircraft engine components (turbine discs, compressor impellers, etc.)","Note clarifies no substantive change, reducing interpretive burden"],"plain_english_summary":"The Civil Aviation Safety Authority is reorganising airworthiness rules for TFE731-series turbine engines by revoking 32 existing Airworthiness Directives and reissuing those same requirements as separate legal instruments under the Civil Aviation Safety Regulations 1998. The move keeps the safety content unchanged (with several ADs formally marked “CANCELLED”) and mainly affects operators, owners and maintenance organisations by changing the legal form, not the substance, of the obligations."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/f2006b07717","history":"/api/acts/f2006b07717/history","analysis":"/api/acts/f2006b07717/analysis","conflicts":"/api/acts/f2006b07717/conflicts","importantCases":"/api/acts/f2006b07717/important-cases","documents":"/api/acts/f2006b07717/documents"}}