{"id":"F2008L01919","name":"AD/B747/377 - Fuselage Exterior Skin at Station 488","slug":"ad-b747-377-fuselage-exterior-skin-at-station-488","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74145,"registerId":"commonwealth-F2008L01919-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/B747/377 | Fuselage Exterior Skin at Station 488 | 7/2008 |\n| ----------- | ------------------------------------- | ------ |\n\n| Applicability: | Model 747-200F, -300, -400, and -400D series aircraft; as identified in Boeing Service Bulletin 747-53A2685 Revision 1, or later FAA approved revision.                                                                                                                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-09-20 Amdt 39-15501.                                                                                                                                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of3 July 2008.                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 3 July 2008.                                                                                                                                                                                                                                                                                                                              |\n| Background:    | The FAA received reports of missing fasteners from the shear clip of the sub frame to auxiliary sill joint and cracking of the adjacent exterior skin and internal doubler. Missing fasteners could result in cracks in the adjacent exterior skin and internal doubler, which can propagate and result in loss of structural integrity and sudden in-flight decompression of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n16 May 2008","sortOrder":0},{"sectionNumber":"AD/B747/377","sectionType":"part","heading":"AD/B747/377","content":"## AD/B747/377","sortOrder":1},{"sectionNumber":"Fuselage Exterior Skin at Station 488","sectionType":"part","heading":"Fuselage Exterior Skin at Station 488","content":"## Fuselage Exterior Skin at Station 488","sortOrder":2},{"sectionNumber":"7/2008","sectionType":"part","heading":"7/2008","content":"## 7/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not alter the substantive scope of required work; it adopts FAA AD 2008-09-20 and references Boeing Service Bulletin 747-53A2685 Rev 1 for affected models. The only procedural change noted in the text is a revised effective date of 3 July 2008 (Compliance; Requirement)."},"complexity_factors":["Cross-reference to external FAA AD for the detailed technical steps and corrective actions (Requirement).","Dependence on Boeing Service Bulletin 747-53A2685 Rev 1 to identify affected airframes (Applicability).","Safety-critical inspections and repairs to structural components (Background) requiring maintenance resources and parts.","A revised effective date requiring operators to schedule compliance by 3 July 2008 (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 747-200F, -300, -400 and -400D aircraft identified in Boeing Service Bulletin 747-53A2685 Rev 1 to carry out the inspections and corrective actions set out in FAA AD 2008-09-20. The directive becomes effective 3 July 2008. It responds to reports of missing shear‑clip fasteners and cracking of the exterior skin and internal doubler that can propagate to loss of structural integrity and sudden in‑flight decompression; operators and their maintenance providers bear the inspection and repair costs and must follow the FAA/Boeing technical instructions (Requirement; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific structural defect on specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined aircraft model categories in applicability","Single technical requirement that references an external document (FAA AD 2008-09-20) rather than spelling out detailed steps","No nested exceptions or conditional logic — compliance is mandatory and straightforward","No interpretation section with defined terms","Simple effective date and compliance structure"],"plain_english_summary":"This Airworthiness Directive requires operators of certain Boeing 747 models (-200F, -300, -400, -400D) to inspect and repair a fuselage joint at Station 488 after missing fasteners were found to cause skin and doubler cracking. Left uncorrected, the damage can compromise structural integrity and cause sudden decompression. The Australian AD adopts FAA AD 2008-09-20 (effective 3 July 2008) and is legally binding on affected operators."},"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-b747-377-fuselage-exterior-skin-at-station-488","history":"/api/acts/ad-b747-377-fuselage-exterior-skin-at-station-488/history","analysis":"/api/acts/ad-b747-377-fuselage-exterior-skin-at-station-488/analysis","conflicts":"/api/acts/ad-b747-377-fuselage-exterior-skin-at-station-488/conflicts","importantCases":"/api/acts/ad-b747-377-fuselage-exterior-skin-at-station-488/important-cases","documents":"/api/acts/ad-b747-377-fuselage-exterior-skin-at-station-488/documents"}}