{"id":"F2006B07886","name":"Airworthiness Directives 2004 - Revocation and Remaking - General Electric Turbine Engines - CT7 Series","slug":"airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50887,"registerId":"commonwealth-F2006B07886-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 - General Electric Turbine Engines - CT7 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\nGeneral Electric Turbine Engines - CT7 Series\n\nAD Name AD Number\n\nCT7-TP Service Life Limits - CANCELLED AD/CT7/1 Amdt 24\n\nCT7-TS Life Limits - Engine Rotating Parts - CANCELLED AD/CT7/2 Amdt 3\n\nCompressor Modification, Power Lever Control Adjustment And Engine AD/CT7/3\n\nTurbine Rotor Discs AD/CT7/4\n\nRotor Parts AD/CT7/5\n\nPropeller Shafts AD/CT7/6\n\nStage 1 and Stage 2 Gas Generator Turbine Disks AD/CT7/7 Amdt 1\n\nReplacement of Aft Stage 2 Turbine Cooling Plates AD/CT7/8\n\nCompressor Variable Geometry Schedule AD/CT7/9\n\nPropeller Gearbox(PGB) AD/CT7/10 Amdt 2\n\n2nd Stage Turbine Aft Cooling Plates AD/CT7/11","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope not changed. The instrument expressly revokes the listed CT7 ADs and reissues them in identical form (see the note and Schedule 1). No new technical requirements or expanded subjects are introduced; the change is administrative."},"complexity_factors":["Multiple instruments affected: 11 named ADs listed in Schedule 1 (increases administrative scope).","Legal mechanism is procedural: revocation and re‑making under subregulation 39.001(1) rather than substantive amendment (low legal complexity).","Technical content unchanged: note states each AD is re‑made in exactly the same form (reduces substantive regulatory complexity).","Delegated decision‑making: action taken by CASA delegate under subregulation 39.001(1) (centralised administrative discretion).","Compliance burden remains on operators/maintenance organisations for inspections, replacements and record‑keeping (operational complexity).","Potential for administrative friction: splitting or reissuing instruments can affect filing, cross‑referencing and tracking of obligations."],"plain_english_summary":"This instrument revokes a set of Airworthiness Directives (ADs) that apply to General Electric CT7 series turbine engines and reissues each AD as a separate, identical instrument. It is made by a Civil Aviation Safety Authority delegate under subregulation 39.001(1).\n\nAircraft operators, maintenance organisations and parts suppliers using CT7 engines must continue to follow the reissued ADs and bear the usual compliance costs (inspections, parts replacement, record‑keeping). The stated change is administrative: texts are remade in the same form rather than introducing new technical requirements (see Schedule 1 and accompanying note)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument explicitly maintains the same scope as the original directives. The note states each directive is 'being re-made in exactly the same form as appears in the latest published edition,' indicating no expansion or alteration of regulatory scope."},"complexity_factors":["Single operative provision with two clear actions (revocation and remaking)","No defined terms section — relies on external understanding of 'Airworthiness Directive' and engine technical specifications","Heavy reliance on attached schedules (Schedule 1 and 11 separate attachments) which are not reproduced in the instrument text","Cross-reference to subregulation 39.001(1) of Civil Aviation Safety Regulations 1998 for legal authority","Technical subject matter (turbine engine components like 'Stage 1 and Stage 2 Gas Generator Turbine Disks') requires specialised aviation engineering knowledge to fully understand implications","Note clarifies no substantive change, reducing interpretive burden"],"plain_english_summary":"This instrument revokes 11 existing Airworthiness Directives for General Electric CT7 engines and immediately reissues them as new legal instruments with their content unchanged. It affects CT7 engine operators, maintenance organisations, and CASA for enforcement purposes. This is administrative housekeeping to correct legal form and ensure proper regulatory authority—practical maintenance, inspection and compliance obligations remain exactly the same."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-general-electric-turbine-engines-ct7-series/documents"}}