{"id":"F2006B02842","name":"AD/B737/140 - Main Landing Gear Axle Flange","slug":"ad-b737-140-main-landing-gear-axle-flange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42184,"registerId":"commonwealth-F2006B02842-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/B737/140 Main Landing Gear Axle Flang","sectionType":"part","heading":"AD/B737/140 Main Landing Gear Axle Flange 5/2000","content":"# AD/B737/140 Main Landing Gear Axle Flange 5/2000\n\nApplicability: Model 737-100, \\-200, \\-300, \\-400, and \\-500 series aircraft, line positions 1 through\n\n2135.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2000-05-13 Amdt 39-11623.\n\nNote: Boeing All Operators Telex M-7272-96-1442 and Boeing Service Bulletin 737- 32-1253 refer.\n\nCompliance: As specified in the Requirement document with a revised effective date of 18 May 2000.\n\nThis Airworthiness Directive becomes effective on 18 May 2000.\n\nBackground: The FAA received reports of cracking of the main landing gear axle flange and reports of deterioration of the brake mounting gasket. The actions specified by this Directive are intended to prevent fracture of the axle and separation of the wheel from the landing gear.\n\n![Signature of Bernard Malcolm Hole, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 4 April 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 April 2000.","sortOrder":1}],"analysis":{"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD adopts and enforces the technical requirements of FAA AD 2000-05-13 for the specified Boeing 737 models and line positions; the Australian instrument does not expand or narrow the technical scope in its text, but sets an Australian effective date of 18 May 2000."},"complexity_factors":["Cross-reference to external technical instruments: Requirement mandates compliance with FAA AD 2000-05-13 (Amdt 39-11623) rather than reproducing technical steps, forcing operators to obtain and interpret that FAA document.","Multiple supplier references: Note cites Boeing All Operators Telex M-7272-96-1442 and Boeing Service Bulletin 737-32-1253, increasing document-tracking and versioning effort for operators.","Applicability identification: Limited to 737-100 to -500 series, line positions 1–2135, requiring operators to determine affected aircraft by line number.","Regulatory anchoring: Issued under subregulation 39.1(1) of CAR 1998 and formalised by CASA delegate signature, creating an enforceable national requirement tied to an overseas AD.","Compliance timing: Compliance is 'as specified' in the referenced FAA document with a revised effective date (18 May 2000), so timing obligations depend on the external AD's schedules.","Operational burden: Background cites axle cracking and brake-gasket deterioration; implied need for inspections, repairs or part replacement creates direct costs, labour and aircraft downtime for operators.","Limited substantive detail in text: The AD states purpose and references but does not set out inspection criteria, methods or corrective actions, shifting technical discretion to the FAA/Boeing materials."],"plain_english_summary":"This directive orders operators of Boeing 737-100, -200, -300, -400 and -500 series (line positions 1–2135) to carry out inspections and corrective work specified in FAA AD 2000-05-13 to address cracking of the main landing gear axle flange and deterioration of the brake mounting gasket. CASA, via its delegate, makes compliance mandatory in Australia with an effective date of 18 May 2000. Operators pay for inspections/repairs and must follow the referenced FAA/Boeing technical instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific mechanical defect in specific Boeing 737 models. It does not expand beyond the original safety purpose of preventing axle fractures."},"complexity_factors":["Very short document (under 300 words)","Only 3 substantive sections: Applicability, Requirement, and Compliance","Single cross-reference to external FAA document (AD 2000-05-13) — the actual technical requirements are contained there, not here","No defined terms section — uses plain language and aircraft model numbers","No conditional logic or nested exceptions — straightforward mandate","Simple linear structure with clear effective date"],"plain_english_summary":"This AD requires Australian operators of early Boeing 737s (‑100 to ‑500, line numbers 1–2135) to comply with FAA AD 2000‑05‑13, mandating inspection and repair of the main landing‑gear axle flange and related brake gaskets. Cracks and gasket deterioration can lead to axle fracture and wheel separation. The AD adopts the FAA requirement into Australian law, effective 18 May 2000."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-140-main-landing-gear-axle-flange","history":"/api/acts/ad-b737-140-main-landing-gear-axle-flange/history","analysis":"/api/acts/ad-b737-140-main-landing-gear-axle-flange/analysis","conflicts":"/api/acts/ad-b737-140-main-landing-gear-axle-flange/conflicts","importantCases":"/api/acts/ad-b737-140-main-landing-gear-axle-flange/important-cases","documents":"/api/acts/ad-b737-140-main-landing-gear-axle-flange/documents"}}