{"id":"F2006B09643","name":"AD/F100/41 - Main Landing Gear Torque Link Dampers","slug":"ad-f100-41-main-landing-gear-torque-link-dampers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54455,"registerId":"commonwealth-F2006B09643-current","compilationNumber":null,"startDate":"2026-04-02","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/F100/41 Main Landing Gear Torque Link","sectionType":"part","heading":"AD/F100/41 Main Landing Gear Torque Link Dampers 6/2000","content":"# AD/F100/41 Main Landing Gear Torque Link Dampers 6/2000\n\nApplicability: Model F 28 Mk 0070 and 0100 aircraft.\n\nRequirement: Remove main landing gear torque link dampers P/N 23700-1 or 23700-3 from the aircraft and install modified main landing gear damper P/N 23700-5 IAW Fokker SB SBF-100-32-114.\n\nNote: RLD AD 1999-138 Dated 29 October1999 refers.\n\nCompliance: Unless previously carried out, any Fokker 100 aircraft fitted with Messier Dowty dampers not modified to CSB-32-50, within 15 months time in service from the effective date of this Directive.\n\nUnless previously carried out, any Fokker 100 aircraft fitted with Messier Dowty dampers modified to CSB-32-50, within 21 months time in service from the effective date of this Directive.\n\nUnless previously carried out, any Fokker 100 aircraft fitted with Menasco dampers, within 24 months time in service from the effective date of this Directive.\n\nUnless previously carried out, any Fokker 70 aircraft fitted with Menasco dampers, within 24 months time in service from the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 15 June 2000.\n\nBackground: The aircraft manufacturer has advised that following a main landing gear separation, after landing, investigation confirmed that separation of the landing gear had been caused by performance degradation of the damper and the resulting loss of damping capability.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 2 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 17 May 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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific mechanical defect in specific aircraft models with a targeted remedy. There is no evidence of scope creep; the document remains focused solely on the torque link damper replacement requirement for Fokker 70 and 100 aircraft."},"complexity_factors":["Very short document (approximately 300 words)","Only 4 defined part numbers (P/N 23700-1, 23700-3, 23700-5, and CSB-32-50)","Single clear requirement with no nested conditions or exceptions","Straightforward applicability section covering only two aircraft models","Compliance deadlines are clearly tiered by equipment type but use simple 'unless previously carried out' language","No cross-references to other legislation beyond a single note about a related directive","Minimal regulatory machinery — issued under a single subregulation (39.1(1) of CAR 1998)"],"plain_english_summary":"This CASA safety order requires owners/operators of certain Fokker 70 and 100 aircraft to replace worn torque link dampers with an improved part (PN 23700-5) per the manufacturer’s Service Bulletin after reports of main landing gear separation. \n\nIt applies to aircraft with specific Messier Dowty or Menasco dampers, sets compliance deadlines (months vary by damper/modification history), and aims to prevent dangerous landing-gear collapse."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text does not indicate a change to the AD's original corrective scope. It prescribes removal and replacement of identified damper part numbers on specified Fokker models, cites the manufacturer's investigation linking damper degradation to gear separation (Background), and sets distinct service‑time compliance deadlines by damper type and model (Applicability; Requirement; Compliance). Operators remain responsible for parts, maintenance and scheduling."},"complexity_factors":["Multiple staggered compliance windows by damper make and aircraft model, which creates tracking and scheduling complexity (Compliance).","Mandated installation of a specific replacement part by part number requires parts procurement and verification during maintenance (Requirement; Applicability).","Reliance on an external manufacturer service bulletin (Fokker SBF‑100‑32‑114) for the technical work instructions introduces dependency on another document (Requirement).","Operators bear the direct costs: parts, maintenance labour and aircraft downtime; these are not quantified in the AD (Requirement; Compliance).","Regulatory enforcement and issuance authority are exercised by the CASA delegate under CAR 1998 subreg 39.1(1), creating an administrative compliance obligation (preamble).","Reference to a prior AD (RLD AD 1999‑138) means operators must reconcile this AD with existing directives/checklists (Note).","Compliance measured by 'time in service' requires accurate flight‑time/cycle accounting to determine deadlines (Compliance)."],"plain_english_summary":"*This directive requires operators of specified Fokker 100 and Fokker 70 aircraft to remove certain main landing‑gear torque link dampers (identified by part number) and install a modified damper (P/N 23700‑5) in accordance with a Fokker service bulletin. It sets different compliance deadlines depending on damper make and model because investigations linked damper degradation to a landing‑gear separation.*"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers","history":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers/history","analysis":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers/analysis","conflicts":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers/conflicts","importantCases":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers/important-cases","documents":"/api/acts/ad-f100-41-main-landing-gear-torque-link-dampers/documents"}}