{"id":"F2006L00362","name":"AD/CFE 738/4 - Stage 2 High Pressure Turbine Aft Cooling Plate","slug":"ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116977,"registerId":"commonwealth-F2006L00362-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"CFE Company Turbine Engines - CFE 738 Se","sectionType":"division","heading":"CFE Company Turbine Engines - CFE 738 Series","content":"### CFE Company Turbine Engines - CFE 738 Series\n\n| AD/CFE 738/4 | Stage 2 High Pressure TurbineAft Cooling Plate | 3/2006 |\n| ------------ | ---------------------------------------------- | ------ |\n\n| Applicability: | CFE Model CFE738-1-1B turbofan engines, part number (P/N) 3050000-5, with gas generator modules P/N 6091T09G01, serial numbers (SN's) 800421, 800422, 800423, 800424, 800425, 800426, 800427, 800428, 800429, and 800430 installed.Note 1: These engines are installed on, but not limited to Dassault-Breguet Falcon 2000 series aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the stage 2 HPT aft cooling plate for nicks, dents, and scratches on surface D in accordance with the requirements of CFE Alert Service Bulletin (ASB) No. CFE738-A72-8031, Revision 4, dated 27 March 2002, paragraph 2.B.(1).2. Repair those stage 2 HPT aft cooling plates with indentation 0.003 inch deep or less in accordance with ASB No. CFE738-A72-8031, Revision 4 paragraph 2.B.(1).3. Remove from service before further flight those stage 2 HPT aft cooling plates that have nicks, dents, and/or scratches that exceed the acceptance limits in accordance with ASB No. CFE738-A72-8031, paragraph 2.B.(1), and replace with serviceable parts.4. Inspect the stage 2 HPT rotor disk post aft mating surface for raised metal, and remove raised metal if present in accordance with ASB No. CFE738-A72-8031, Revision 4, paragraph 2.B.(2).Note 2: FAA AD 99-27-16R1 Amdt 39-12791 refers. |\n| Compliance:    | Unless previously accomplished, carry out at the next shop visit where the HPT assembly is sufficiently disassembled to afford access to the stage 2 HPT aft cooling plate but not later than 4,500 part cycles-since-new.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 16 March 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n\n| Background: | The actions detailed in this AD are intended to prevent stage 2 high pressure turbine (HPT) aft cooling plate failure, which could result in an uncontained engine failure and damage to the aeroplane. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n1 February 2006","sortOrder":0},{"sectionNumber":"AD/CFE 738/4","sectionType":"part","heading":"AD/CFE 738/4","content":"## AD/CFE 738/4","sortOrder":1},{"sectionNumber":"Stage 2 High Pressure Turbine Aft Coolin","sectionType":"part","heading":"Stage 2 High Pressure Turbine Aft Cooling Plate","content":"## Stage 2 High Pressure Turbine  \nAft Cooling Plate","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to CFE738-1-1B engines with the listed gas‑generator module serial numbers and specified part numbers. The instrument sets inspection, repair, removal and timing requirements for those engines; no expansion or narrowing of that applicability is indicated in the text."},"complexity_factors":["Narrow technical scope: single engine model (CFE738-1-1B) and specific gas-generator serial numbers reduce applicability complexity (Applicability).","Prescriptive inspection/repair rules referencing an external Alert Service Bulletin (ASB No. CFE738-A72-8031, Revision 4) require implementers to follow another document (Requirement).","Clear pass/fail acceptance limits and a numeric repair threshold (indentation ≤ 0.003 inch) simplify decision-making but require precise measurement capability (Requirement).","Single compliance trigger tied to shop visit or a fixed life limit (4,500 part cycles‑since‑new) makes scheduling straightforward but enforces a strict deadline (Compliance).","Safety consequence is high (risk of uncontained engine failure), increasing administrative priority and potential operational disruption despite limited technical breadth (Background)."],"plain_english_summary":"This Airworthiness Directive requires inspection, repair or removal/replacement of the stage 2 high‑pressure turbine (HPT) aft cooling plate and removal of raised metal on the rotor disk post mating surface for specified CFE738‑1‑1B engines with listed gas‑generator serial numbers. Operators must carry out the work at the next suitable shop visit or before 4,500 part cycles‑since‑new; operators fund and perform the work, and the regulator enforces compliance to reduce the risk of uncontained engine failure (Requirement; Compliance; Background)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific manufacturing defect or wear pattern in a discrete batch of engines. The scope remains precisely limited to the 10 identified serial numbers and the specific cooling plate component. No scope creep is evident."},"complexity_factors":["Single, specific technical subject matter (one engine part on 10 specific engines)","Only 4 numbered requirements with clear conditional logic (inspect → repair if minor → replace if major)","No defined terms section — technical terms are industry standard or explained by reference to manufacturer bulletin","Single cross-reference to FAA AD for background context only","Clear compliance deadline with simple alternative timing ('next shop visit' OR '4,500 cycles')","No nested exceptions or conditional sub-clauses","Document is 1 page with highly structured table format"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection, repair or replacement of the stage‑2 high‑pressure turbine aft cooling plate on specific CFE738‑1‑1B engines (used on Dassault Falcon 2000s), affecting owners, operators and maintainers of those serial‑numbered engines. Work is required at the next shop visit or by 4,500 flight cycles to prevent damaged plates from causing uncontained engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate","history":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate/history","analysis":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate/analysis","conflicts":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate/conflicts","importantCases":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate/important-cases","documents":"/api/acts/ad-cfe-738-4-stage-2-high-pressure-turbine-aft-cooling-plate/documents"}}