{"id":"F2007L00352","name":"AD/B747/355 - STA 2360 Aft Pressure Bulkhead Web Lap Joint","slug":"ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":63351,"registerId":"commonwealth-F2007L00352-current","compilationNumber":null,"startDate":"2026-04-02","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/B747/355 | STA 2360 Aft PressureBulkhead Web Lap Joint | 3/2007 |\n| ----------- | ------------------------------------------- | ------ |\n\n| Applicability: | Model 747 -100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series aircraft.                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2007-02-24 Amdt 39-14911.Note: Boeing Alert Service Bulletin 747-53A2561 original issue, or later FAA approved revision, refers.                                                                                                                                                                          |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of15 March 2007.                                                                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 15 March 2007.                                                                                                                                                                                                                                                                                                         |\n| Background:    | The FAA received the results of analysis by the manufacturer that the radial lap splices of the STA 2360 aft pressure bulkhead are subject to widespread fatigue damage. Such cracking, unless detected and corrected, could join together from multiple sites to form cracks of critical length, and result in rapid decompression and loss of control of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n1 February 2007","sortOrder":0},{"sectionNumber":"AD/B747/355","sectionType":"part","heading":"AD/B747/355","content":"## AD/B747/355","sortOrder":1},{"sectionNumber":"STA 2360 Aft PressureBulkhead Web Lap Jo","sectionType":"part","heading":"STA 2360 Aft PressureBulkhead Web Lap Joint","content":"## STA 2360 Aft Pressure  \nBulkhead Web Lap Joint","sortOrder":2},{"sectionNumber":"3/2007","sectionType":"part","heading":"3/2007","content":"## 3/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD adopts the FAA AD requirements for STA 2360 aft pressure-bulkhead lap splices and applies them to the listed Boeing 747 models; the instrument text does not indicate an expansion or narrowing of scope beyond the referenced FAA AD."},"complexity_factors":["Reliance on an external directive (FAA AD 2007-02-24) and a manufacturer service bulletin (Boeing Alert Service Bulletin 747-53A2561) increases procedural complexity and version-control risk (Requirement).","Applies to multiple Boeing 747 variants (Applicability), requiring fleet-wide coordination and variant-specific records.","Addresses safety-critical structural fatigue (Background) where detection and repair scope may be extensive and technically demanding.","Compliance deadline (effective 15 March 2007) imposes scheduling, parts and manpower constraints on operators (Compliance).","Potential for significant aircraft downtime and repair costs to operators — economic and logistical burdens are concentrated on operators.","Enforcement is via the Civil Aviation Safety Authority delegate, creating regulatory compliance risk and potential for discretionary oversight."],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Boeing 747 variants to inspect and, and where needed, repair the STA 2360 aft pressure-bulkhead radial lap splices in accordance with FAA AD 2007-02-24 and Boeing Alert Service Bulletin 747-53A2561. It becomes effective 15 March 2007.\n\nThe manufacturer’s analysis found widespread fatigue that could lead to rapid decompression; compliance creates inspection and repair costs and aircraft downtime for operators and is enforced by the Civil Aviation Safety Authority (Delegate)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific structural fatigue issue on a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (STA 2360 — a station number indicating a specific fuselage location)","Single requirement: comply with an external FAA directive","No nested conditions or exceptions","No internal cross-references to other legislation","Technical content is delegated entirely to external documents (FAA AD 2007-02-24 and Boeing Service Bulletin)"],"plain_english_summary":"This AD mandates inspections and repairs of the aft pressure‑bulkhead web lap joint at STA 2360 on specified Boeing 747 series (-100/200/300/400, -F, SR, SP). It affects owners and operators of those models and adopts the Boeing service bulletin and corresponding FAA AD. The work must be done to detect and stop fatigue cracking that could link up, cause rapid decompression, and risk loss of control. Effective date: 15 March 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint","history":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint/history","analysis":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint/analysis","conflicts":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint/conflicts","importantCases":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint/important-cases","documents":"/api/acts/ad-b747-355-sta-2360-aft-pressure-bulkhead-web-lap-joint/documents"}}