{"id":"F2008L00596","name":"AD/B747/371 - Overhead Lateral Shear Beam Aft of Door 5","slug":"ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119567,"registerId":"commonwealth-F2008L00596-current","compilationNumber":null,"startDate":"2026-04-03","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/B747/371 | Overhead Lateral Shear Beam Aft of Door 5 | 3/2008 |\n| ----------- | ----------------------------------------- | ------ |\n\n| Applicability: | Model 747-400 and 747-400D series aircraft; as identified in Boeing Special Attention Bulletin 747-53-2498 original issue, or later FAA approved revision.                                                                                                                                                                                                           |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 207-25-18 Amdt 39-15300.                                                                                                                                                                                                                                                                              |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of13 March 2008.                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 13 March 2008.                                                                                                                                                                                                                                                                                                     |\n| Background:    | The FAA received a report indicating that the overhead lateral shear beam aft of main entry door number 5 reacts to certain loads from the weight of the centre stowage bins of zone E, and additional loads. This Directive is intended to prevent detachment of the centre stowage bins of zone E at forward load levels less than 9g during an emergency landing. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n30 January 2008","sortOrder":0},{"sectionNumber":"AD/B747/371","sectionType":"part","heading":"AD/B747/371","content":"## AD/B747/371","sortOrder":1},{"sectionNumber":"Overhead Lateral Shear Beam Aft of Door ","sectionType":"part","heading":"Overhead Lateral Shear Beam Aft of Door 5","content":"## Overhead Lateral Shear Beam Aft of Door 5","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive aligns CASA enforcement with the FAA AD for the same structural issue and applies only to the specific 747-400 / 747-400D aeroplanes listed in the Boeing Special Attention Bulletin. It does not broaden applicability beyond the FAA/Boeing-identified fleet; it sets an effective date (13 March 2008) and mandates operators implement the FAA-specified measures."},"complexity_factors":["Cross-reference to an external FAA airworthiness directive for technical detail (Requirement: FAA AD 207-25-18 Amdt 39-15300) — operators must follow a separate, authoritative document for the substantive work.","Dependence on a manufacturer service bulletin to identify affected aeroplanes (Applicability: Boeing Special Attention Bulletin 747-53-2498) — requires cross-checking fleet records.","Safety‑critical structural nature of the action (Background: overhead lateral shear beam and stowage bin attachments) — involves inspections/repairs with potential engineering and downtime implications.","Defined compliance timing and revised effective date (Compliance: becomes effective 13 March 2008) — creates a hard regulatory deadline for operators.","Enforcement and administrative oversight by CASA (signature/issuance) — compliance non‑observance carries regulatory consequences."],"plain_english_summary":"Requires identified Boeing 747‑400 and 747‑400D aircraft (per Boeing Special Attention Bulletin 747‑53‑2498) to carry out the technical actions set out in FAA AD 207‑25‑18 (Amdt 39‑15300), effective 13 March 2008. CASA says the measure addresses loads on the overhead lateral shear beam aft of door 5 to prevent detachment of the centre stowage bins of zone E under forward loads below 9g. Aircraft operators must implement the FAA-prescribed inspections/repairs and bear the compliance costs; CASA enforces the directive."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose — addressing a known structural defect in a particular aircraft component. It has not expanded beyond its original intent; it precisely targets the overhead lateral shear beam issue in Boeing 747-400 series aircraft as identified in the manufacturer bulletin."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (zone E — a cabin section)","No nested conditional logic or exceptions","Single cross-reference to external FAA document (AD 2007-25-18) — the actual technical requirements are contained there, not in this instrument","Simple applicability test (specific aircraft models identified by manufacturer bulletin)","Straightforward compliance date (single effective date with reference to external document for detailed timing)"],"plain_english_summary":"This Airworthiness Directive mandates inspection and corrective action on the overhead lateral shear beam behind Door 5 of Boeing 747-400 and 747-400D passenger jets to ensure the centre overhead bins in zone E can withstand emergency 9g decelerations. Failure could let bins detach and injure occupants.\n\nIt adopts FAA AD 2007-25-18, affects Australian operators and maintenance organisations, and takes effect 13 March 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5","history":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5/history","analysis":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5/analysis","conflicts":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5/conflicts","importantCases":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5/important-cases","documents":"/api/acts/ad-b747-371-overhead-lateral-shear-beam-aft-of-door-5/documents"}}