{"id":"F2007L00377","name":"AD/CFM56/25 - Air Turbine Starter","slug":"ad-cfm56-25-air-turbine-starter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":63403,"registerId":"commonwealth-F2007L00377-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"CFM International Turbine Engines - CFM5","sectionType":"division","heading":"CFM International Turbine Engines - CFM56 Series","content":"### CFM International Turbine Engines - CFM56 Series\n\n| AD/CFM56/25 | Air Turbine Starter | 3/2007 |\n| ----------- | ------------------- | ------ |\n\n| Applicability: | CFM International turbofan engines CFM56-5, CFM56-5B, CFM56-5C models and with any one of the following part number (P/N) air turbine starters installed:CFM56-5:VIN 3505582-24 (301-807-004-0); or VIN 3505582-25 (301-807-005-0); orVIN 3505582-40 (301-781-203-0); or VIN 3505582-41 (301-806-602-0); orVIN 3505582-42 (301-806-802-0).CFM56-5B or CFM56-5C:VIN 3505582-60 (301-790-903-0); or VIN 3505582-61 (301-806-702-0); orVIN 3505582-62 (301-806-902-0). |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Rework Air Turbine Starter in accordance with the following Service Bulletins (SB), as applicable.CFM56-5 80-0018.CFM56-5 80-0020.CFM56-5B 80-0011.CFM56-5C 80-0013.For the purpose of this AD, starter modification in accordance with the applicable Service Bulletins at any Revision status is acceptable.Note: DGAC Airworthiness Directive F-2003-456 Revision 2 dated29 September 2004 refers.                                                               |\n| Compliance:    | Unless already accomplished, during the next shop visit of the starter from the effective date of this AD, but no later than 31 December 2009.                                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 15 March 2007.                                                                                                                                                                                                                                                                                                                                                                                                    |\n\n| Background: | Several in-service uncontained failures of the air turbine starter have resulted in damage to the engine and/or fan cowl. The actions required by this AD address the unsafe condition associated with uncontained failure of air turbine starters. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n2 February 2007","sortOrder":0},{"sectionNumber":"AD/CFM56/25","sectionType":"part","heading":"AD/CFM56/25","content":"## AD/CFM56/25","sortOrder":1},{"sectionNumber":"Air Turbine Starter","sectionType":"part","heading":"Air Turbine Starter","content":"## Air Turbine Starter","sortOrder":2},{"sectionNumber":"3/2007","sectionType":"part","heading":"3/2007","content":"## 3/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD confines its scope to the unsafe condition of uncontained air turbine starter failures for CFM56-5 series engines fitted with the listed starter part numbers. It does not broaden applicability beyond those engines/P/Ns and maintains the original safety focus; it cross-references a prior DGAC directive but does not state an expansion of scope (Applicability; Background; Requirement)."},"complexity_factors":["Narrow technical applicability: targets specific CFM56-5/-5B/-5C engines with listed air turbine starter part numbers (Applicability).","Dependency on external manufacturer instructions: rework must follow multiple Service Bulletins, at any revision status (Requirement).","Scheduling constraint plus a hard deadline: action due at next starter shop visit but by 31 December 2009 if not earlier (Compliance).","Technical execution and certification: starter rework is specialised maintenance requiring appropriate facilities and qualified personnel (Requirement/implicit).","Cross-reference to foreign regulator AD: cites DGAC AD F-2003-456 Revision 2, introducing cross-jurisdictional documentary links (Requirement/Note).","Enforcement and recordkeeping burden on operators and maintenance organisations to demonstrate compliance (Compliance/implicit)."],"plain_english_summary":"This Airworthiness Directive requires specified air turbine starters on CFM56-5, -5B and -5C engines to be reworked per the manufacturer's Service Bulletins at the next starter shop visit, and no later than 31 December 2009. It affects aircraft owners/operators and maintenance providers, who must schedule and pay for the rework to address past uncontained starter failures that have damaged engines and cowlings."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety defect in identified engine models. The scope remains tightly focused on the air turbine starter failure issue as originally identified."},"complexity_factors":["Short, single-purpose directive with one clear requirement","Limited conditional logic (only 'unless already accomplished')","Specific part number identification creates some parsing complexity","Cross-references to four separate Service Bulletins and one French DGAC directive","No nested definitions or interpretation section"],"plain_english_summary":"CASA orders mandatory repair or replacement of Honeywell air turbine starters on specified CFM56-5/5B/5C engines after catastrophic in‑flight starter failures, requiring operators and maintenance organisations to carry out the manufacturer’s service-bulletin fixes. \n\nWork must be completed by 31 December 2009 or at the next scheduled visit, to prevent uncontained starter failures that can damage engines, nacelles, or the aircraft."},"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-cfm56-25-air-turbine-starter","history":"/api/acts/ad-cfm56-25-air-turbine-starter/history","analysis":"/api/acts/ad-cfm56-25-air-turbine-starter/analysis","conflicts":"/api/acts/ad-cfm56-25-air-turbine-starter/conflicts","importantCases":"/api/acts/ad-cfm56-25-air-turbine-starter/important-cases","documents":"/api/acts/ad-cfm56-25-air-turbine-starter/documents"}}