{"id":"F2008L01514","name":"AD/B737/323 - MLG Support Beam","slug":"ad-b737-323-mlg-support-beam","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119906,"registerId":"commonwealth-F2008L01514-current","compilationNumber":null,"startDate":"2026-04-03","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/B737/323 | MLG Support Beam | 6/2008 |\n| ----------- | ---------------- | ------ |\n\n| Applicability: | Model 737-100, -200, -200C, -300, -400, and -500 series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-08-10 Amdt 39-15462.Note: Boeing Service Bulletins 737-57A1266 Revision 1, and 737-57-1052Revision 4, or later FAA approved revision, refer.                                                                                                                                                                                                                                                                   |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of5 June 2008.                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 5 June 2008.                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | The FAA received reports of fatigue cracking of the outboard stabilising fitting and stress corrosion cracking of the bolts attaching the fitting to the wing rear spar. Such cracking, unless detected and corrected, could result in disconnection of the main landing gear actuator from the rear spar and support beam, consequent damage to the hydraulic system with possible loss of the “A” and “B” hydraulic systems, and damage or jamming of the flight control cables. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 April 2008","sortOrder":0},{"sectionNumber":"AD/B737/323","sectionType":"part","heading":"AD/B737/323","content":"## AD/B737/323","sortOrder":1},{"sectionNumber":"MLG Support Beam","sectionType":"part","heading":"MLG Support Beam","content":"## MLG Support Beam","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to the listed 737 models and adopts the FAA AD's technical requirements; the text does not expand the range of affected aircraft or actions. The only procedural adjustment in this instrument is the revised effective date of 5 June 2008."},"complexity_factors":["Incorporation by reference of FAA AD 2008-08-10 and multiple Boeing Service Bulletins (requires cross-jurisdictional reading and any later FAA-approved revisions).","Technical nature: fatigue cracking and stress‑corrosion issues require specialist inspection techniques and possible structural repairs or bolt replacements.","Affected fleet range: six 737 series variants increases variation in configuration and possible workscopes per aircraft history.","Operational impact: inspections/repairs may cause aircraft downtime and logistics coordination for parts and maintenance slots.","Compliance date revision: explicit effective date (5 June 2008) creates a fixed enforcement timeline."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 737-100, -200, -200C, -300, -400 and -500 series aeroplanes to carry out the inspections and corrective actions set out in FAA AD 2008-08-10 (and the referenced Boeing Service Bulletins) to find and fix fatigue and stress‑corrosion cracking in the main landing‑gear outboard stabilising fitting and its attaching bolts. It matters to aircraft owners/operators because they must fund and schedule the inspections and any repairs, and compliance is mandatory from 5 June 2008 under the Civil Aviation Safety Authority delegate."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive implementing a foreign aviation safety order. It maintains its original narrow scope: addressing a specific structural defect in specific aircraft models. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","Only 6 defined model variants in applicability","Single technical requirement referencing external documents (FAA AD and Boeing Service Bulletins)","No nested conditional logic or exceptions within the text itself","Compliance date is straightforward (single fixed date)","However, full compliance requires accessing and interpreting external technical documents (FAA AD 2008-08-10 and Boeing Service Bulletins), which contain detailed engineering specifications not reproduced here"],"plain_english_summary":"This AD requires operators of older Boeing 737 Classics (-100 through -500 series) to inspect and repair fatigue and stress‑corrosion cracking in the main landing gear support beam, following the procedures in FAA AD 2008‑08‑10 and the specified Boeing service bulletins. \n\nIt affects airlines and maintenance organisations using these models and is safety‑critical: unaddressed cracks could disconnect the landing gear actuator, damage hydraulics and jam controls, grounding non‑compliant aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-323-mlg-support-beam","history":"/api/acts/ad-b737-323-mlg-support-beam/history","analysis":"/api/acts/ad-b737-323-mlg-support-beam/analysis","conflicts":"/api/acts/ad-b737-323-mlg-support-beam/conflicts","importantCases":"/api/acts/ad-b737-323-mlg-support-beam/important-cases","documents":"/api/acts/ad-b737-323-mlg-support-beam/documents"}}