{"id":"F2017L00910","name":"AD/CFM56/15 Amdt 2 - Fuel Filter Cover Attachment Inspection","slug":"ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":96801,"registerId":"commonwealth-F2017L00910-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"CFM International Turbine Engines - CFM5","sectionType":"part","heading":"CFM International Turbine Engines - CFM56 Series","content":"# CFM International Turbine Engines - CFM56 Series\n\n| AD/CFM56/15 Amdt 2 | Fuel Filter Cover Attachment Inspection | 14/2017 |\n| ------------------ | --------------------------------------- | ------- |\n\n| Applicability: | CFM International (CFMI) CFM56-3, -3B & -3C engines.                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect fuel filter cover attachment hardware in accordance with CFMI Service Bulletin CFM56-3 73-126 Revision 1 as in force at the time of issue of this AD.2. Modify the engine driven fuel pump to provide improved filter cover retention in accordance with CFMI Service Bulletin CFM 56-3 73-A129 as in force at the time of issue of this AD.Note 1: DGAC 1999-245(B)R1 also refers.Note 2: Compliance with Requirement 2 constitutes terminating action for this AD.                                   |\n| Compliance:    | 1. Unless previously accomplished, no later than the next A check after the effective date of this AD.2. No later than the date of commencement of this AD.Note 3: Compliance with both requirements in AD/CFM56/15 Amdt 1 constitutes compliance with this AD.                                                                                                                                                                                                                                                   |\n|                | This AD commences on 19 July 2017.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| Background:    | The fuel filter cover is secured with six bolts torqued in helicoil inserts. Loose inserts have been discovered in two aircraft which have resulted in heavy fuel loss in flight.The original issue of this AD became effective on 7 October 1999.Amendment 1 of this AD required modification of the engine driven pump to provide an improved fuel filter cover retention design.Amendment 2 of this AD is issued to correct a minor typographical error in the DGAC AD number referenced in Note 1 of this AD. |\n\n![](image.001.png)\n\nBen Wilson  \nDelegate of the Civil Aviation Safety Authority\n\n7 July 2017","sortOrder":0},{"sectionNumber":"AD/CFM56/15 Amdt 2","sectionType":"part","heading":"AD/CFM56/15 Amdt 2","content":"## AD/CFM56/15 Amdt 2","sortOrder":1},{"sectionNumber":"Fuel Filter Cover Attachment Inspection","sectionType":"part","heading":"Fuel Filter Cover Attachment Inspection","content":"## Fuel Filter Cover Attachment Inspection","sortOrder":2},{"sectionNumber":"14/2017","sectionType":"part","heading":"14/2017","content":"## 14/2017","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 2 only corrects a minor typographical error in the DGAC AD reference (Background). It does not alter the Applicability, the two Requirements, the compliance timings, or the terminating‑action status; therefore the AD's substantive scope remains unchanged from the prior issue."},"complexity_factors":["Narrow applicability limited to CFMI CFM56-3, -3B & -3C engines (Applicability).","Two distinct actions: an inspection per SB CFM56-3 73-126 Rev 1 and a pump modification per SB CFM56-3 73-A129 (Requirement 1 & 2).","One action (pump modification) is designated as terminating action for the AD, affecting long‑term compliance obligations (Requirement 2; Note 2).","Compliance timing tied to maintenance schedule and AD commencement (inspection by next A check; modification by AD start) creating coordination with operators' maintenance planning (Compliance).","Reliance on external documents “as in force at the time” (service bulletins) introduces variation and administrative dependence on SB content (Requirement).","Amendment limited to correcting a typographical error in a referenced DGAC AD number, not changing substantive requirements (Background)."],"plain_english_summary":"This airworthiness directive requires operators of CFMI CFM56-3, -3B and -3C turbine engines to inspect the fuel filter cover attachment hardware and to modify the engine‑driven fuel pump per CFMI service bulletins. Compliance deadlines tie the inspection to the next A‑check and the pump modification to the AD commencement; the pump change is a terminating action. The AD responds to discovered loose helicoil inserts that caused in‑flight fuel loss (Requirement; Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment does not change the scope. It is purely administrative — correcting a typo in a reference number (DGAC 1999-245(B)R1). The substantive safety requirements remain identical to Amendment 1, and the original intent (mandating fuel filter cover inspections and pump modifications) is unchanged."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 substantive requirements with clear compliance deadlines","Minimal defined terms (only standard aviation abbreviations like 'AD', 'A check')","No nested conditional logic or cross-references to other legislation","Straightforward terminating action structure (compliance with Requirement 2 ends the obligation)","Single amendment purpose (typographical correction) with explicit background explanation"],"plain_english_summary":"This CASA Airworthiness Directive requires inspection and modification of CFM56‑3 series engines on older 737s to fix loose threaded inserts (helicoils) on the fuel filter cover that have caused in‑flight fuel leaks. Operators must follow the manufacturer’s service instructions to inspect the attachment hardware and install a pump modification that secures the cover; the modification terminates recurring inspections.\n\nAmendment 2 only corrects a typographical error in the referenced DGAC document; the safety requirements are unchanged."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection","history":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection/history","analysis":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection/analysis","conflicts":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection/conflicts","importantCases":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection/important-cases","documents":"/api/acts/ad-cfm56-15-amdt-2-fuel-filter-cover-attachment-inspection/documents"}}