{"id":"F2006B08692","name":"AD/CT7/8 - Replacement of Aft Stage 2 Turbine Cooling Plates","slug":"ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51858,"registerId":"commonwealth-F2006B08692-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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\nGeneral Electric Turbine Engines \\- CT7 Series","sortOrder":0},{"sectionNumber":"AD/CT7/8 Replacement of Aft Stage 2 Turb","sectionType":"part","heading":"AD/CT7/8 Replacement of Aft Stage 2 Turbine Cooling Plates 4/2002","content":"# AD/CT7/8 Replacement of Aft Stage 2 Turbine Cooling Plates 4/2002\n\nApplicability: General Electric CT7-5A2, -5A3, -7A and -7A1 engines incorporating part number 6064T07P02 stage 2 aft cooling plates with serial numbers beginning with the letters GFF.\n\nRequirement: (a) Replace stage 2 aft cooling plates P/N 6064T07P02 having serial numbers that begin with the letters GFF with stage 2 aft cooling plates P/N 6064T07P05.\n\n(b) After the effective date of this AD, do not install any stage 2 aft cooling plates P/N 6064T07P02 with serial numbers that begin with the letters GFF.\n\nNote: FAA AD 2002-01-03 refers.\n\nCompliance: Unless previously accomplished, at the next overhaul of the engine or hot section module or within 8000 cycles after the effective date of this AD, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 18 April 2002.\n\nBackground: Cracking of a stage 2 turbine aft cooling plate resulted in an uncontained engine failure. This AD has been issued to require removal of certain stage 2 aft cooling plates.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 5 March 2002\n\n![](image.001.png)","sortOrder":1}],"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":2,"scope_assessment":{"changed":false,"description":"Scope remains focused on removing and replacing a specific part batch that caused a safety incident. It does not broaden applicability beyond the listed engine models, part number, and serial-number range, nor add new types of obligations beyond replacement and a reinstallation ban."},"complexity_factors":["Very narrow applicability: specific engine models and a single serial-number prefix ('GFF') limit affected fleet.","Single, prescriptive corrective action: mandatory part replacement (P/N 6064T07P02 -> P/N 6064T07P05).","Clear compliance timing: at next overhaul or within 8,000 cycles reduces interpretive ambiguity.","Prohibition on reinstallation increases traceability and parts-control needs for operators.","Operational burden on owners/operators to source replacement plates and schedule downtime (cost and logistics).","Cross-reference to FAA AD (related guidance/technical background) but no additional procedural complexity added."],"plain_english_summary":"This Airworthiness Directive requires operators of General Electric CT7-5A2, -5A3, -7A and -7A1 engines fitted with stage 2 aft cooling plates P/N 6064T07P02 whose serial numbers begin with “GFF” to replace those plates with P/N 6064T07P05 and forbids reinstalling the old plates. It responds to a cracking-related uncontained engine failure; replacement must occur at the next engine or hot‑section overhaul or within 8,000 cycles, whichever is sooner."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific unsafe condition in specific engine models with specific part numbers. There is no evidence of scope creep; it remains a targeted safety intervention for a identified mechanical defect."},"complexity_factors":["Single, specific technical requirement with clear part numbers and serial number prefixes","Only 4 engine models affected, explicitly listed","Simple compliance deadline: 'whichever occurs first' of two events","No nested exceptions, conditional logic, or cross-references to other legislation","Minimal defined terms (only standard aviation terminology like 'cycles' and 'overhaul')","Short document (~250 words) with clear structure: Applicability, Requirement, Compliance, Background"],"plain_english_summary":"The CASA safety order requires owners/operators of aircraft with certain GE CT7 engines (CT7-5A2, -5A3, -7A, -7A1) to stop fitting and to replace cooling plates (PN 6064T07P02, S/Ns beginning \"GFF\") with the revised PN ending in P05. Replacement is due at the next engine overhaul or within 8,000 flight cycles after 18 April 2002. The measure prevents cracked plates that can cause uncontained engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates","history":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates/history","analysis":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates/analysis","conflicts":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates/conflicts","importantCases":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates/important-cases","documents":"/api/acts/ad-ct7-8-replacement-of-aft-stage-2-turbine-cooling-plates/documents"}}