{"id":"F2006B03528","name":"AD/BAe 146/80 - Main Landing Gear Sidestay","slug":"ad-bae-146-80-main-landing-gear-sidestay","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43095,"registerId":"commonwealth-F2006B03528-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/BAe 146/80 Main Landing Gear Sidestay","sectionType":"part","heading":"AD/BAe 146/80 Main Landing Gear Sidestay 9/2000","content":"# AD/BAe 146/80 Main Landing Gear Sidestay 9/2000\n\nApplicability: All BAe 146 series aircraft and all AVRO 146-RJ aircraft, fitted with sidestays as listed in Messier-Dowty Service Bulletin (SB) 146-32-148.\n\nRequirement: Inspect in accordance with BAE Systems Mandatory SB 32-157.\n\nCompliance: As specified in the Requirement document for the initial and repetitive inspection requirements, with an effective date of 7 September 2000.\n\nThis Airworthiness Directive becomes effective on 7 September 2000.\n\nBackground: The manufacturer received a report of a crack found at the fuselage end on the main landing gear inner sidestay by the anti-rotation pin. This Directive requires NDT inspection at the fuselage end of the main landing gear inner sidestays.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 31 July 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 9 August 2000.","sortOrder":1}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the stated purpose in the AD: it applies to all BAe 146 series and AVRO 146-RJ aircraft fitted with the sidestays listed in the referenced Messier-Dowty service bulletin and mandates inspections per BAE Mandatory SB 32-157 to address a reported crack. No change in scope from the instrument's stated objective is indicated in the text."},"complexity_factors":["Reference to external service documents (BAE Mandatory SB 32-157 and Messier-Dowty SB 146-32-148) — compliance requires obtaining and following those documents.","Technical inspection requirement (non-destructive testing at the fuselage end) — needs certified NDT personnel and facilities.","Applicability limited to aircraft fitted with listed sidestays — operators must review fleet configuration to determine applicability.","Initial and repetitive inspection schedule — creates ongoing maintenance planning, operational downtime and recurring costs.","Safety-critical component inspection may lead to mandatory repairs or grounding if cracks are found, producing direct cost and operational impact.","Effective date is fixed (7 September 2000) — creates a concrete compliance deadline."],"plain_english_summary":"This Airworthiness Directive requires operators of BAe 146 and AVRO 146‑RJ aircraft fitted with the sidestays listed in Messier‑Dowty SB 146‑32‑148 to perform non‑destructive inspections at the fuselage end of the main landing gear inner sidestay, following BAE Systems Mandatory SB 32‑157. The inspections (initial and repetitive) are mandatory from 7 September 2000. It affects aircraft operators (who fund inspections and repairs), maintenance organisations that perform NDT, and CASA as regulator, by creating recurring maintenance and record‑keeping obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection for the reported crack condition."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (NDT — non-destructive testing, explained in context)","No nested conditional logic or cross-references to other legislation","Single straightforward requirement: inspect per specified manufacturer bulletin","Clear applicability section with unambiguous aircraft models listed","No exceptions, exemptions, or alternative compliance methods mentioned"],"plain_english_summary":"This safety order requires operators of BAe 146 and AVRO 146‑RJ aircraft to perform mandatory non‑destructive inspections of the inner sidestay where it attaches to the fuselage, following BAE Systems Mandatory Service Bulletin 32‑157. Issued after a crack was found, it imposes initial and repetitive checks to prevent landing‑gear collapse, affects all owners/operators with the listed sidestays, and took effect 7 September 2000."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay","history":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay/history","analysis":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay/analysis","conflicts":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay/conflicts","importantCases":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay/important-cases","documents":"/api/acts/ad-bae-146-80-main-landing-gear-sidestay/documents"}}