{"id":"F2005L03176","name":"AD/B737/247 - MLG Beam Support Fitting Lugs","slug":"ad-b737-247-mlg-beam-support-fitting-lugs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":134430,"registerId":"commonwealth-F2005L03176-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/B737/247 | MLG Beam Support Fitting Lugs | 12/2005 |\n| ----------- | ----------------------------- | ------- |\n\n| Applicability: | Model 737-100, -200, -200C, and -300 series aircraft, with line numbers 1 through 1670.                                                                                                                                                                                                                                                                                                                         |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-18-08 Amdt 39-14248.Note: Boeing Service Bulletins 737-57-1267, 737-57-1216 Revision 2, and737-57A1260 Revision 2, or later FAA approved revisions, refer.                                                                                                                                                                                  |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of24 November 2005.                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 24 November 2005.                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | The FAA received reports of discrepancies on the lugs of the support fitting of the main landing gear beam. The actions required by this Directive are intended to prevent separation of the support beam of the main landing gear from the rear spar, which could cause cracking of the main landing gear support fitting and consequent leakage from the wing fuel tank or collapse of the main landing gear. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 October 2005","sortOrder":0},{"sectionNumber":"AD/B737/247","sectionType":"part","heading":"AD/B737/247","content":"## AD/B737/247","sortOrder":1},{"sectionNumber":"MLG Beam Support Fitting Lugs","sectionType":"part","heading":"MLG Beam Support Fitting Lugs","content":"## MLG Beam Support Fitting Lugs","sortOrder":2},{"sectionNumber":"12/2005","sectionType":"part","heading":"12/2005","content":"## 12/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument adopts the requirements of FAA AD 2005-18-08 for the specified early 737 fleet and does not broaden the population or change required actions; the visible modification is an administrative revision to the effective date (Compliance: revised effective date 24 November 2005)."},"complexity_factors":["Cross-reference to FAA AD 2005-18-08 and multiple Boeing service bulletins (Requirement) — requires operators to obtain and follow external technical documents.","Limited, model‑and‑line‑number applicability (Applicability) — requires fleet identification for affected airframes (models 737‑100/200/200C/300, line numbers 1–1670).","Revised effective date (Compliance) — administrative timing change to 24 November 2005 that operators must track.","Technical, safety‑critical inspections and potential repairs (Background) — work may require specialised maintenance, parts, and downtime.","Allowance for later FAA‑approved revisions of service bulletins (Requirement) — introduces dependence on regulator approvals for acceptable methods."],"plain_english_summary":"This Airworthiness Directive compels operators of early Boeing 737s (models 737‑100, ‑200, ‑200C and ‑300, line numbers 1–1670) to perform the inspections and corrective work set out in FAA AD 2005‑18‑08 and the referenced Boeing service bulletins to address defects in the main landing gear (MLG) beam support fitting lugs. The measures aim to prevent the MLG support beam separating from the rear spar, which could lead to wing fuel leakage or landing gear collapse."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It addresses a particular structural defect in specific aircraft models and does not expand beyond its original safety intent. The scope remains tightly focused on the MLG beam support fitting lug issue."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability (aircraft models/line numbers), requirement (reference to external FAA AD), compliance date, and background","Heavy reliance on external documents — the actual technical work is contained in FAA AD 2005-18-08 and three Boeing Service Bulletins, which are not reproduced here","No nested conditional logic or exceptions within the text itself","Simple linear structure: what planes, what problem, what to do, when to do it","Single cross-reference (to FAA AD) rather than multiple internal cross-references"],"plain_english_summary":"This AD requires owners/operators in Australia of early Boeing 737-100/200/200C/300 aircraft (production line numbers 1–1670) to inspect and repair corroded or cracked main landing gear beam support fitting lugs. It adopts FAA AD 2005-18-08 and referenced Boeing service instructions, making those inspections and corrective actions mandatory.\n\nThe defect can cause wing fuel leaks or main gear collapse; the directive took effect 24 November 2005."},"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-b737-247-mlg-beam-support-fitting-lugs","history":"/api/acts/ad-b737-247-mlg-beam-support-fitting-lugs/history","analysis":"/api/acts/ad-b737-247-mlg-beam-support-fitting-lugs/analysis","conflicts":"/api/acts/ad-b737-247-mlg-beam-support-fitting-lugs/conflicts","importantCases":"/api/acts/ad-b737-247-mlg-beam-support-fitting-lugs/important-cases","documents":"/api/acts/ad-b737-247-mlg-beam-support-fitting-lugs/documents"}}