{"id":"F2010L02402","name":"AD/B747/269 Amdt 1 - Engine Core Cowl Latch Modification","slug":"ad-b747-269-amdt-1-engine-core-cowl-latch-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84309,"registerId":"commonwealth-F2010L02402-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/269 Amdt 1 | Engine Core Cowl Latch Modification | 17/2010 |\n| ------------------ | ----------------------------------- | ------- |\n\n| Applicability: | Boeing 747-400 series aircraft equipped with General Electric CF6-80C2 series engines; as specified in the requirement document.                                                                                                                                                                                                                                                                                                                                                                                         |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Modify the left and right hand core cowl assemblies of the engines per Boeing Service Bulletin 747-71-2285 Revision 1.2. Do not install aluminium core cowl assembly, part number 224-2301-513 (left hand) or 224-2302-539 (right hand) on any aircraft.Later revisions to SB 747-71-2285, approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2001-16-07, are considered acceptable for compliance with the equivalent Requirements of this AD. |\n|                | Note: FAA AD 2001-16-07 Amdt 39-12375 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | 1. Before 24 September 2004.2. As of 6 months after the original effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                              |\n|                | This Amendment becomes effective on 3 September 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | This modification alleviates a potential unsafe condition in which an engine fire can lead to opening of the core cowl in flight and its separation with the strut fire barrier from the airplane.This amendment notates the acceptance of later revisions of the manufacturer’s data which is approved as an AMOC with FAA AD 2001-16-07.The original issue of this AD became effective on 18 April 2002.                                                                                                               |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n26 August 2010","sortOrder":0},{"sectionNumber":"AD/B747/269 Amdt 1","sectionType":"part","heading":"AD/B747/269 Amdt 1","content":"## AD/B747/269 Amdt 1","sortOrder":1},{"sectionNumber":"Engine Core Cowl Latch Modification","sectionType":"part","heading":"Engine Core Cowl Latch Modification","content":"## Engine Core Cowl Latch Modification","sortOrder":2},{"sectionNumber":"17/2010","sectionType":"part","heading":"17/2010","content":"## 17/2010","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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the 2002 Airworthiness Directive. The change is purely administrative — it expands the acceptable methods of compliance to include later FAA-approved revisions of the manufacturer's service bulletin. The core safety objective (preventing core cowl separation during engine fires) and the affected aircraft population remain unchanged."},"complexity_factors":["Multiple effective dates creating overlapping compliance timelines (original 2002 date, 2004 deadline, 2010 amendment effective date, and 6-month grace period)","Cross-references to external technical documents (Boeing Service Bulletin 747-71-2285 Revision 1.2, FAA AD 2001-16-07, and AMOC approvals)","Specific part number prohibitions (224-2301-513 and 224-2302-539) requiring precise inventory tracking","Conditional acceptance clause for 'later revisions' contingent on FAA AMOC approval","Limited applicability scope requiring verification of both aircraft series and engine type"],"plain_english_summary":"This CASA Airworthiness Directive mandates installing improved latches on left and right engine core cowls of Boeing 747-400 aircraft with GE CF6-80C2 engines to prevent cowls separating during an engine fire. It affects operators of those airplanes and is legally required to reduce the risk of a fire becoming a catastrophic structural failure.\n\nAmendment 1 lets operators follow later Boeing service bulletin revisions if FAA‑approved as acceptable alternatives, giving more flexibility while maintaining safety."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment records acceptance of later revisions of Boeing Service Bulletin 747-71-2285 that have been approved by the FAA as an Alternate Means of Compliance to FAA AD 2001-16-07, thereby allowing compliance via those later, FAA-approved SB revisions rather than only the originally cited revision (Requirement; Background)."},"complexity_factors":["Cross-reference to a manufacturer service bulletin and FAA airworthiness directive/AMOC creates dependency on external approvals (Requirement; Background).","Prohibition of specific part numbers requires parts tracking and parts-control processes (Requirement).","Multiple and historical compliance deadlines increase record-keeping and retrospective compliance checks (Compliance).","Physical modification of core cowl assemblies involves technical work, potential downtime and parts procurement (Requirement).","Amendment records acceptance of later SB revisions approved as AMOC, introducing administrative discretion tied to FAA approvals (Requirement; Background).","Effective dates and amendment history require operators to reconcile original AD timing with the 2010 amendment (Background; header)."],"plain_english_summary":"Operators of Boeing 747-400 aircraft with General Electric CF6-80C2 engines must modify the left and right engine core cowl assemblies following Boeing Service Bulletin 747-71-2285 Rev 1.2 and must not install two specified aluminium core cowl part numbers (Applicability; Requirement). The work and any replacement parts are the operators' responsibility and must be done by the stated compliance dates (Compliance). CASA accepts later SB revisions if approved by the FAA as an Alternate Means of Compliance (Requirement; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification","history":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification/history","analysis":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification/analysis","conflicts":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification/conflicts","importantCases":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification/important-cases","documents":"/api/acts/ad-b747-269-amdt-1-engine-core-cowl-latch-modification/documents"}}