{"id":"F2006L00363","name":"AD/CFE 738/3 - High Pressure Turbine Stage 1 Aft Cooling Plate and Stage 2 Disc","slug":"ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116979,"registerId":"commonwealth-F2006L00363-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 738/3 | High Pressure Turbine Stage 1 AftCooling Plate and Stage 2 Disc | 3/2006 |\n| ------------ | --------------------------------------------------------------- | ------ |\n\n| Applicability: | CFE Company model CFE738-1-1B turbofan engines with high pressure turbine (HPT) stage 1 aft cooling plates, part number (P/N) 6083T38P07, and HPT stage 2 disks, P/N's 6083T92P06, 6083T92P07, 6083T92P08, 6083T92P10, and 6083T92P11, installed.Note 1: These engines are installed on, but not limited to Dassault-Breguet Falcon 2000 series aeroplanes.                                                                                  |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Replace the HPT stage 1 aft cooling plate P/N 6083T38P07.2. Replace HPT stage 2 disks, P/N's 6083T92P06, 6083T92P07, 6083T92P08, 6083T92P10, and 6083T92P11.3. Do not install any HPT stage 1 aft cooling plate, P/N 6083T38P07, that exceeds 3,500 CSN.4. Do not install any HPT stage 2 disk, P/N 6083T92P06, 6083T92P07, 6083T92P08, 6083T92P10, or 6083T92P11, that exceeds 2,700 CSN.Note 2: FAA AD 2002-09-10 Amdt 39-12743 refers. |\n| Compliance:    | 1. At or before the cooling plate accumulates 3,500 cycles-since-new (CSN).2. At or before the disk accumulates 2,700 CSN.3. After the effective date of this AD.4. After the effective date of this AD.                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 16 March 2006.                                                                                                                                                                                                                                                                                                                                                                             |\n\n| Background: | This AD requires replacing the HPT stage 1 aft cooling plate and HPT stage 2 disks at or before they reach new reduced life cycle limits. This is prompted by analysis of the existing life cycle limits by the engine manufacturer. The actions specified by this AD are intended to prevent failure of the HPT stage 1 aft cooling plate and HPT stage 2 disks, 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 738/3","sectionType":"part","heading":"AD/CFE 738/3","content":"## AD/CFE 738/3","sortOrder":1},{"sectionNumber":"High Pressure Turbine Stage 1 Aft Coolin","sectionType":"part","heading":"High Pressure Turbine Stage 1 Aft Cooling Plate and Stage 2 Disc","content":"## High Pressure Turbine Stage 1 Aft  \nCooling Plate and Stage 2 Disc","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Scope changed from prior practice by imposing reduced life limits for the listed HPT components: stage‑1 aft cooling plate life reduced to 3,500 CSN and stage‑2 disks to 2,700 CSN, requiring earlier replacements and banning installation of items exceeding those CSNs (Background; Requirement)."},"complexity_factors":["Clear technical trigger based on cycles‑since‑new (CSN) thresholds rather than condition‑based inspection (Compliance).","Multiple specific part numbers for affected components (Requirement, Applicability).","Operational burden on operators to track CSN and schedule replacements before limits (Compliance).","Prohibition on installing parts that exceed CSN limits creates strict compliance boundary (Requirement).","Reference to related FAA AD (FAA AD 2002-09-10) introduces cross‑jurisdictional consistency considerations (Requirement, Background).","Fixed effective date creates immediate enforceability rather than phased rollout (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of CFE738-1-1B engines to replace specified high‑pressure turbine parts before newly reduced life limits. The stage‑1 aft cooling plate (P/N 6083T38P07) must be replaced at or before 3,500 cycles‑since‑new (CSN); listed stage‑2 disks must be replaced at or before 2,700 CSN, and installing parts beyond those CSN limits is prohibited.\n\nAircraft operators pay for and schedule the replacements and must track CSNs. The action follows the manufacturer's review of life limits and aims to reduce the risk of uncontained engine failure."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing specific safety-critical engine components identified through manufacturer analysis. It has not expanded beyond its initial purpose of mandating replacement of the HPT stage 1 aft cooling plate and stage 2 disks."},"complexity_factors":["Single, specific technical subject matter (two engine components)","Clear, unambiguous compliance deadlines tied to measurable flight cycles (CSN - cycles-since-new)","Only 4 specific part numbers for disks plus 1 for cooling plates","No nested exceptions or conditional logic — requirements apply uniformly","No cross-references to other legislation (only a reference to related FAA directive for context)","Straightforward applicability section with explicit aircraft type","Plain language background explaining safety rationale"],"plain_english_summary":"This AD mandates replacement of two HPT parts on CFE738-1-1B turbofan engines (used on Dassault Falcon 2000 and similar aircraft): HPT Stage 1 aft cooling plates before 3,500 flight cycles and HPT Stage 2 disks before 2,700 cycles. It affects owners, operators and maintenance organisations; compliance (from 16 March 2006) prevents accelerated wear that could cause catastrophic in‑flight engine failure."},"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/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc","history":"/api/acts/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc/history","analysis":"/api/acts/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc/analysis","conflicts":"/api/acts/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc/conflicts","importantCases":"/api/acts/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc/important-cases","documents":"/api/acts/ad-cfe-738-3-high-pressure-turbine-stage-1-aft-cooling-plate-and-stage-2-disc/documents"}}