{"id":"F2006B03343","name":"AD/B767/166 - Engine Core Cowl Latch Modification","slug":"ad-b767-166-engine-core-cowl-latch-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42780,"registerId":"commonwealth-F2006B03343-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBoeing 767 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B767/166 Engine Core Cowl Latch Modif","sectionType":"part","heading":"AD/B767/166 Engine Core Cowl Latch Modification 4/2002","content":"# AD/B767/166 Engine Core Cowl Latch Modification 4/2002\n\nApplicability: Boeing 767 series aircraft equipped with General Electric CF6-80C2 series engines; as listed in Boeing Service Bulletin 767-71-0088.\n\nRequirement: 1. Modify the left and right hand core cowl assemblies of the engines per Boeing Service Bulletin 767-71-0088.\n\n2. Do not install aluminium core cowl assembly, part number 224-2301-513 (left hand) or 224-2302-539 (right hand) on any aircraft.\n\nNote: FAA AD 2001-16-07 Amdt 39-12375 refers.\n\nCompliance: 1. Before 24 September 2004.\n\n2. As of 6 months after the effective date of this AD.\n\nThis Airworthiness Directive becomes effective on 18 April 2002.\n\nBackground: 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.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 10 March 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change to scope: the instrument confines action to Boeing 767s with GE CF6-80C2 engines and mandates a specified core cowl modification plus a ban on two aluminium cowl part numbers to address the cowl opening/separation risk (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Technical modification must follow Boeing Service Bulletin 767-71-0088 (Requirement), requiring maintenance shop capability and parts availability","Applicability is limited to Boeing 767s with GE CF6-80C2 engines, so operators must identify affected airframes (Applicability)","Two compliance deadlines: full modification by a calendar date and parts prohibition effective six months after the AD (Compliance)","Prohibition requires parts-tracking and inventory controls to prevent installation of specified aluminium core cowl part numbers (Requirement)","Regulatory enforcement under CAR 1998 subregulation 39.1(1) via a CASA delegate creates a binding mandatory action (preamble/first paragraph)","Cross-reference to FAA AD 2001-16-07 may require coordination with international maintenance practices and records (Note)"],"plain_english_summary":"This AD requires operators of Boeing 767s with General Electric CF6‑80C2 engines to modify both engine core cowl assemblies per Boeing Service Bulletin 767‑71‑0088 and bans installation of two specified aluminium core cowl part numbers. CASA’s delegate set firm compliance deadlines (modification by 24 Sep 2004; parts prohibition six months after the AD) to address a risk that an engine fire could open and detach a core cowl and its strut fire barrier in flight."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific safety defect in a specific aircraft type with specific engines, requiring a specific modification. There is no evidence of scope creep; the directive remains tightly focused on the engine core cowl latch safety issue as originally identified."},"complexity_factors":["Single, clearly defined applicability (Boeing 767 series with specific engines)","Only 2 main requirements with straightforward compliance dates","No defined terms section or interpretation provisions","No nested exceptions or conditional logic","Cross-reference to only one external document (Boeing Service Bulletin) and one FAA directive for information","Short document (approximately 250 words of substantive text)","Clear, imperative language ('Modify', 'Do not install')"],"plain_english_summary":"This safety order requires airlines and maintenance crews operating Boeing 767s with GE CF6-80C2 engines to modify the engine core cowls and prohibits installing certain aluminium cowl parts found unsafe.  \n\nIt prevents a known failure mode where an engine fire could open and detach the cowl in flight, creating a severe hazard; the modification follows Boeing Service Bulletin 767-71-0088 and had specified compliance deadlines."},"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-b767-166-engine-core-cowl-latch-modification","history":"/api/acts/ad-b767-166-engine-core-cowl-latch-modification/history","analysis":"/api/acts/ad-b767-166-engine-core-cowl-latch-modification/analysis","conflicts":"/api/acts/ad-b767-166-engine-core-cowl-latch-modification/conflicts","importantCases":"/api/acts/ad-b767-166-engine-core-cowl-latch-modification/important-cases","documents":"/api/acts/ad-b767-166-engine-core-cowl-latch-modification/documents"}}