{"id":"F2006B03132","name":"AD/B747/234 - Aft Pressure Bulkhead","slug":"ad-b747-234-aft-pressure-bulkhead","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42504,"registerId":"commonwealth-F2006B03132-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.002.png)\n\n![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/B747/234 Aft Pressure Bulkhead 11/200","sectionType":"part","heading":"AD/B747/234 Aft Pressure Bulkhead 11/2000","content":"# AD/B747/234 Aft Pressure Bulkhead 11/2000\n\nApplicability: Model 747 series aircraft, as listed in Boeing Alert Service Bulletin 747-53A2425. Requirement: Inspect in accordance with the technical requirements of FAA AD 2000-12-19 Amdt\n\n39-11797.\n\nCompliance: As specified in the Requirement document for the initial and repetitive inspection requirements, with a revised effective date of 2 November 2000.\n\nThis Airworthiness Directive becomes effective on 2 November 2000.\n\nBackground: The FAA received a report of fatigue cracking found in the upper half of the aft pressure bulkhead.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 13 September 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 4 October 2000.","sortOrder":1}],"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":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspections for fatigue cracking in the aft pressure bulkhead of Boeing 747s."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability (specific Boeing 747 models via reference to external bulletin)","Single requirement referencing external technical document (FAA AD 2000-12-19)","No nested conditions or exceptions","No internal cross-references beyond the standard AD structure","Compliance timing is straightforward (external document specifies schedule, with fixed effective date)"],"plain_english_summary":"This AD makes it mandatory for operators of specified Boeing 747s to inspect the aft pressure bulkhead for fatigue cracking, following the procedures in FAA AD 2000-12-19 and Boeing service guidance. \n\nIt matters because detected fatigue cracks could lead to catastrophic loss of cabin pressure or structural failure; compliance under Australian law is required to ensure continued airworthiness and safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD adopts and enforces the FAA-mandated inspections for the aft pressure bulkhead without expanding applicability or requirements beyond the FAA/Boeing references. Applicability is limited to models listed in the Boeing Alert Service Bulletin; the Requirement and Compliance sections implement the FAA AD rather than altering scope (Applicability; Requirement; Compliance)."},"complexity_factors":["Cross-reference to external technical documents (FAA AD 2000-12-19 and Boeing Alert Service Bulletin 747-53A2425) creates dependency on non‑Australian texts (Requirement; Applicability).","Requires both initial and repetitive inspections, imposing ongoing compliance and recordkeeping (Compliance).","Technical inspection standards and any corrective repairs are specified in the referenced documents rather than fully in the AD, requiring operator interpretation of those materials (Requirement).","Legal basis is a single delegated power under CAR 1998 subreg 39.1(1), limiting discretionary complexity but concentrating decision authority (opening paragraph).","Effective date and revision of timing are stated, so operators must align maintenance planning to the stated effective date (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing Model 747 aircraft listed in Boeing Alert Service Bulletin 747-53A2425 to perform initial and recurring inspections of the aft pressure bulkhead in line with FAA AD 2000-12-19, after reports of fatigue cracking. It took effect 2 November 2000. Operators must follow the AD’s technical instructions and timing (Requirement; Compliance), so operators pay inspection and repair costs and face regulatory enforcement under the CASA delegate’s authority (subreg 39.1(1); Applicability; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-234-aft-pressure-bulkhead","history":"/api/acts/ad-b747-234-aft-pressure-bulkhead/history","analysis":"/api/acts/ad-b747-234-aft-pressure-bulkhead/analysis","conflicts":"/api/acts/ad-b747-234-aft-pressure-bulkhead/conflicts","importantCases":"/api/acts/ad-b747-234-aft-pressure-bulkhead/important-cases","documents":"/api/acts/ad-b747-234-aft-pressure-bulkhead/documents"}}