{"id":"F2006B03137","name":"AD/B747/239 - Main Entry Door 1 Forward Edge Frame","slug":"ad-b747-239-main-entry-door-1-forward-edge-frame","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42509,"registerId":"commonwealth-F2006B03137-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/B747/239 Main Entry Door 1 Forward Ed","sectionType":"part","heading":"AD/B747/239 Main Entry Door 1 Forward Edge Frame 3/2001","content":"# AD/B747/239 Main Entry Door 1 Forward Edge Frame 3/2001\n\nApplicability: Model 747 series aircraft, line numbers 1 through 685.\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 2000-24-07 Amdt 39-12014.\n\nCompliance: As specified in the Requirement document with a revised effective date of 22 March 2001.\n\nThis Airworthiness Directive becomes effective on 22 March 2001.\n\nBackground: The FAA received reports of cracking in the frame web, doubler, inner chord, and strap of the forward edge frame of main entry door number 1. Such cracking could result in inability of the edge frame to react door stop loads, and consequent rapid decompression of the aircraft.\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 24 January 2001\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 February 2001.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific structural defect in a specific aircraft model range. It has not expanded beyond its original purpose of mandating inspections for door frame cracking."},"complexity_factors":["Very short document (under 300 words)","Only 4 structural sections: Applicability, Requirement, Compliance, Background","Single cross-reference to external FAA document for technical details","No defined terms section — uses plain language and standard aviation terminology","No nested conditions or exceptions — straightforward mandate: inspect these specific aircraft using that specific method by that specific date","Clear, unambiguous applicability criteria (line numbers 1-685)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the forward edge frame around the main entry door on early Boeing 747s (line numbers 1–685). It requires following the FAA’s inspection procedures to detect cracks that could lead to door-frame failure and rapid decompression. It affects owners/operators of those aircraft and took effect 22 March 2001."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Australian AD adopts the FAA's inspections and timelines rather than introducing additional or broader requirements. It remains narrowly focused on inspecting the forward edge frame of Main Entry Door 1 on Boeing 747s (line numbers 1–685) to address reported cracking and the resulting decompression risk. The only notable change is administrative: Australia enforces the FAA AD's technical requirements with an Australian effective date (22 March 2001). There is no substantive expansion beyond the FAA mandate or beyond the stated safety purpose."},"complexity_factors":["Short, single‑issue AD (limited scope to forward edge frame of Main Entry Door 1)","Single external cross‑reference to FAA AD 2000‑24‑07 (technical detail not reproduced)","Clear, narrow applicability (Model 747, line numbers 1–685) reduces reach but requires checking serial/line numbers","Compliance timing relies on the external document (revised effective date specified)","Low number of conditional clauses or exceptions in the Australian text itself"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- This is an Airworthiness Directive (AD) requiring specific inspections of the forward edge frame of Main Entry Door 1 on Boeing 747 series aircraft (line numbers 1–685). (Applicability)\n- The AD does not set out its own technical inspection steps; instead it requires operators to carry out the inspections and any follow‑up work exactly as set out in FAA AD 2000‑24‑07. (Requirement)\n- Compliance must follow the timelines and procedures in the referenced FAA AD, with a revised effective date of 22 March 2001. (Compliance / Effective date)\n\n**Who it affects**\n\n- Aircraft operators and maintenance organisations that operate or maintain Boeing 747 aircraft with line numbers 1–685. They are legally required to perform the inspections and any corrective action set out in the FAA document.\n- The Civil Aviation Safety Authority (CASA) delegate enforces the requirement in Australia and has issued the AD under the relevant CAR subregulation. (Powers of issuance and signature block)\n\n**Why it matters**\n\n- The FAA received reports of cracking in components of the forward edge frame of Main Entry Door 1 (frame web, doubler, inner chord and strap). Cracking there could prevent the edge frame from taking door stop loads and could lead to rapid decompression. (Background)\n- The AD forces a standardised inspection regime intended to detect those cracks before they threaten structural integrity and in‑flight safety.\n\n**Who pays, who decides, and what changes in behaviour**\n\n- Who pays: Operators/airlines pay for the inspections, any non‑routine maintenance, and any parts and labour required to fix defects discovered. If defects require removal from service or extensive repair, that increases cost and operational disruption.\n- Who decides: CASA (via its delegate) makes the AD mandatory in Australia, but the detailed technical method and intervals are those set out by the FAA AD that the CASA AD incorporates by reference. Operators must follow the FAA AD instructions as adopted. (Requirement)\n- Behaviour change: Operators must schedule the specified inspections, record compliance, and carry out repairs or replacements when cracks are found. This may change maintenance cycles and aircraft availability.\n\n**Trade‑offs, implementation and compliance issues**\n\n- Benefit vs cost: The directive trades inspection and repair cost and potential aircraft downtime against reduced risk of in‑flight decompression due to undetected cracking.\n- Dependence on an external technical standard: The CASA AD incorporates the FAA AD rather than reproducing technical detail. That keeps the Australian instrument short but requires operators to obtain and follow the FAA document; it also ties Australian compliance timing and methods to FAA decisions. (Requirement)\n- Implementation risk: Timely detection depends on thorough inspections performed to the FAA standard. Any ambiguity in transferring the FAA instructions into local maintenance practice could create compliance gaps.\n- Concentration of costs: Costs are concentrated on the operators of older 747s (line numbers 1–685). The safety benefit is diffuse (passengers, crew, general aviation safety) but directly realised by the operator through reduced accident risk.\n\n**Concrete citation map to the AD text**\n- Applicability: \"Model 747 series aircraft, line numbers 1 through 685.\" (Applicability)\n- Requirement: \"Inspect in accordance with the technical requirements of FAA AD 2000‑24‑07 Amdt 39‑12014.\" (Requirement)\n- Compliance / Effective date: \"As specified in the Requirement document with a revised effective date of 22 March 2001.\" and \"This Airworthiness Directive becomes effective on 22 March 2001.\" (Compliance / Effective date)\n- Background (safety reason): reports of cracking and risk of rapid decompression. (Background)\n\n(End of summary.)"},"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-b747-239-main-entry-door-1-forward-edge-frame","history":"/api/acts/ad-b747-239-main-entry-door-1-forward-edge-frame/history","analysis":"/api/acts/ad-b747-239-main-entry-door-1-forward-edge-frame/analysis","conflicts":"/api/acts/ad-b747-239-main-entry-door-1-forward-edge-frame/conflicts","importantCases":"/api/acts/ad-b747-239-main-entry-door-1-forward-edge-frame/important-cases","documents":"/api/acts/ad-b747-239-main-entry-door-1-forward-edge-frame/documents"}}