{"id":"F2008L02927","name":"AD/B737/337 - Main Wheel Well Pressure Deck Web Panel","slug":"ad-b737-337-main-wheel-well-pressure-deck-web-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74854,"registerId":"commonwealth-F2008L02927-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/337 | Main Wheel Well Pressure Deck Web Panel | 9/2008 |\n| ----------- | --------------------------------------- | ------ |\n\n| Applicability: | Model 737-300 and -400 series aircraft; as identified in Boeing Special Attention Service Bulletin 737-57-1289 dated 13 June 2007, or later FAA approved revision.                                                                                                                                                          |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-13-25 Amdt 39-15588.                                                                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of28 August 2008.                                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 28 August 2008.                                                                                                                                                                                                                                                           |\n| Background:    | The FAA received several reports indicating that cracks ranging from 0.8 to 8.0 inches long were found on a certain web panel of the main wheel well pressure deck. Undetected fatigue cracking in the web panel of the main wheel well pressure deck could result in venting and consequent decompression of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n14 July 2008","sortOrder":0},{"sectionNumber":"AD/B737/337","sectionType":"part","heading":"AD/B737/337","content":"## AD/B737/337","sortOrder":1},{"sectionNumber":"Main Wheel Well Pressure Deck Web Panel","sectionType":"part","heading":"Main Wheel Well Pressure Deck Web Panel","content":"## Main Wheel Well Pressure Deck Web Panel","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"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. It has not expanded beyond its original intent of addressing a known structural defect in specific aircraft models."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific aircraft models)","Single cross-reference to external FAA document (AD 2008-13-25)","No nested conditions or exceptions","Clear, single compliance date","Straightforward technical background with no legal ambiguities"],"plain_english_summary":"This CASA Airworthiness Directive requires owners and operators of Boeing 737-300 and -400 series to inspect and repair the main wheel well pressure deck web panel per FAA AD 2008-13-25 by 28 August 2008. The action responds to discovered cracks (up to ~8 inches) that could lead to panel failure and rapid decompression. CASA is making the FAA safety order legally enforceable in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD adopts the technical requirements of FAA AD 2008-13-25 for the aircraft identified in Boeing SB 737-57-1289 and sets an effective date of 28 August 2008. It does not expand applicability or impose requirements beyond the FAA AD’s technical scope; the change is procedural (adoption and effective date) rather than substantive."},"complexity_factors":["Narrow applicability: only Model 737-300 and -400 series identified in Boeing SB 737-57-1289 are affected.","Cross-reference dependence: requires action “in accordance with” FAA AD 2008-13-25 rather than reproducing technical steps, creating reliance on an external document.","Regulatory simplicity: the AD sets compliance by reference and an effective date, with no novel enforcement mechanisms or discretionary administrative processes.","Operational burden lies with operators: inspections and repairs are technical and may require engineering work and downtime, but those are standard maintenance actions."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Boeing 737-300 and -400 series aeroplanes identified in Boeing Special Attention Service Bulletin 737-57-1289 to carry out inspections and any corrective action in line with FAA AD 2008-13-25. It responds to reported fatigue cracks on the main wheel well pressure-deck web panel. Operators must fund and schedule the inspections/repairs; the Civil Aviation Safety Authority enforces compliance, with the AD effective 28 August 2008."},"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-b737-337-main-wheel-well-pressure-deck-web-panel","history":"/api/acts/ad-b737-337-main-wheel-well-pressure-deck-web-panel/history","analysis":"/api/acts/ad-b737-337-main-wheel-well-pressure-deck-web-panel/analysis","conflicts":"/api/acts/ad-b737-337-main-wheel-well-pressure-deck-web-panel/conflicts","importantCases":"/api/acts/ad-b737-337-main-wheel-well-pressure-deck-web-panel/important-cases","documents":"/api/acts/ad-b737-337-main-wheel-well-pressure-deck-web-panel/documents"}}