{"id":"F2006B03179","name":"AD/B747/285 - Inboard Engine Strut Diagonal Brace Attachment","slug":"ad-b747-285-inboard-engine-strut-diagonal-brace-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42551,"registerId":"commonwealth-F2006B03179-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 747 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B747/285 Inboard Engine Strut Diagona","sectionType":"part","heading":"AD/B747/285 Inboard Engine Strut Diagonal Brace Attachment 3/2003","content":"# AD/B747/285 Inboard Engine Strut Diagonal Brace Attachment 3/2003\n\nApplicability: Model 747-200B, \\-300, \\-400, \\-400D, and –400F series aircraft powered by General Electric CF6-80C2 series engines, as listed in Boeing Alert Service Bulletin 747- 54A2207, dated 16 November 2000.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2002-24-03 Amdt 39-12968.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 20 March 2003.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.\n\nBackground: The FAA requires certain actions to detect discrepancies of the fasteners that attach the diagonal brace attach fittings of the lower spar on the inboard engine struts, and modification of the fasteners if discrepancies are found.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 30 January 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It addresses a particular mechanical defect in a defined aircraft population. There is no indication of scope creep; it remains tightly focused on the diagonal brace fastener issue as originally identified."},"complexity_factors":["Short, single-purpose directive (4 pages including headers and signature)","Only 1 defined applicability criterion (specific aircraft models and engine types)","Technical requirements incorporated by reference to external FAA document rather than spelled out in full","No nested exceptions or conditional logic within the directive itself","Simple compliance structure: 'do what the FAA says, by this date'","Minimal cross-referencing (only to Boeing Service Bulletin and FAA AD)"],"plain_english_summary":"This Airworthiness Directive mandates inspections and corrective action on the inboard engine strut diagonal-brace fasteners of certain Boeing 747-200B/300/400/400D/400F aircraft equipped with GE CF6-80C2 engines (per Boeing Alert SB 747-54A2207). It adopts FAA AD 2002-24-03, became effective 20 March 2003, and requires following that AD’s inspection and repair instructions.\n\nIt matters because defective fasteners could lead to engine instability or separation, so the AD prevents catastrophic structural failure."},"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":4,"scope_assessment":{"changed":false,"description":"The AD adopts the technical requirements of FAA AD 2002-24-03 for the same components and aircraft types listed, and does not expand the set of actions required. The only explicit alteration in this instrument is a revised effective date of 20 March 2003 (Requirement; Compliance)."},"complexity_factors":["Cross-reference to external FAA AD 2002-24-03 and Boeing Alert Service Bulletin 747-54A2207: technical requirements are not reproduced in the text and must be obtained from those documents (Requirement).","Narrow technical scope limited to specific 747 models and a specific engine family (Applicability), requiring operators to determine applicability to their fleet.","Regulatory adoption mechanism: CASA delegate issues AD under CAR 1998 subreg 39.1(1), incorporating foreign authority material by reference rather than standalone rule text (opening paragraph; Requirement).","Compliance timing and administrative detail are minimal in the instrument itself; the compliance schedule is entirely as specified in the referenced FAA AD, with only an amended effective date here (Compliance).","Operational and maintenance impact rests with aircraft operators who must perform inspections and any required modifications; the AD does not state cost, parts supply, or on-wing time estimates (Requirement; Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 747-200B/-300/-400/-400D/-400F aeroplanes with General Electric CF6-80C2 engines to inspect and, if necessary, modify the fasteners that attach the diagonal brace fittings on the lower spar of the inboard engine strut. CASA issued the directive under CAR 1998 subreg 39.1(1) and directs operators to follow FAA AD 2002-24-03 and Boeing Alert Service Bulletin 747-54A2207 to detect and correct fastener discrepancies that could affect strut attachment integrity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment","history":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment/history","analysis":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment/analysis","conflicts":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment/conflicts","importantCases":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment/important-cases","documents":"/api/acts/ad-b747-285-inboard-engine-strut-diagonal-brace-attachment/documents"}}