{"id":"F2006B10960","name":"AD/JETSTREAM/91 - Main Landing Gear Radius Rods","slug":"ad-jetstream-91-main-landing-gear-radius-rods","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56529,"registerId":"commonwealth-F2006B10960-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.001.png)\n\n![](image.001.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.\n\nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/JETSTREAM/91 Main Landing Gear Radius","sectionType":"part","heading":"AD/JETSTREAM/91 Main Landing Gear Radius Rods 10/2001","content":"# AD/JETSTREAM/91 Main Landing Gear Radius Rods 10/2001\n\nDM\n\nApplicability: All Jetstream 3100 and 3200 Series aircraft with radius rods part numbers 1847/A through /L (left) and 1862/A through /L (right) installed.\n\nRequirement: Action in accordance with BAE Systems Alert Service Bulletin ASB 32-A-JA010740 Revision 2.\n\nNote: For aircraft on which the Requirement document at original issue has already been accomplished, Revision 2 may require further work to mark affected radius rods with a date for their removal from service.\n\nCompliance: Before 22 September 2001, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 22 August 2001.\n\nBackground: Due to an error in the manufacturing process the material of some radius rod cylinders, part number 184811, may not have received the correct heat treatment. This condition can result in failure of the radius rod and collapse of the landing gear during an abnormal event, such as a heavy landing.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 16 August 2001\n\n![](image.001.png)","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 is a targeted safety directive addressing a specific manufacturing defect in a specific aircraft component. The scope remains precisely limited to the identified unsafe condition and affected aircraft fleet. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","Only 3 substantive sections: Applicability, Requirement, and Compliance","Single cross-reference to an external technical document (BAE Systems Alert Service Bulletin)","No nested exceptions or conditional logic beyond the basic applicability criteria","Minimal defined terms — only standard aviation terminology (radius rods, part numbers)","Clear, imperative language throughout"],"plain_english_summary":"This CASA safety order requires operators of British Aerospace Jetstream 3100/3200 aircraft to inspect and, if necessary, replace certain main-gear radius rods (specific part numbers) because of faulty heat treatment that can weaken them. A failure could cause landing-gear collapse, risking injury and damage. Operators must follow the manufacturer’s service bulletin (ASB 32-A-JA010740 Rev 2) and complete required work by 22 September 2001."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The AD replaces or supplements the original service-bulletin requirement by mandating BAE Systems ASB Revision 2 (Requirement). The AD's Note explicitly states Revision 2 may require further work (marking affected radius rods with a removal date) beyond the original issue, thereby expanding the practical tasks operators must perform compared with the original service-bulletin action (Requirement; Note)."},"complexity_factors":["Narrow, part-number-based applicability limits scope to specific radius rods on Jetstream 3100/3200 aircraft (Applicability).","Mandate delegates technical content to an external manufacturer document — compliance is “in accordance with” ASB 32-A-JA010740 Revision 2 (Requirement).","Fixed, short compliance window creates scheduling pressure for operators (Compliance: before 22 September 2001).","Revision-related additional work: Revision 2 may require extra marking for removal dates beyond original ASB actions (Note), adding potential follow-up tasks.","Safety-critical failure mode cited (incorrect heat treatment → possible rod failure and gear collapse), increasing operational impact of non-compliance (Background).","Regulatory issuance and effective date set by CASA delegate (signature/effective date), reflecting administrative authority and limited discretion in directive form."],"plain_english_summary":"Mechanically, this Airworthiness Directive requires operators of British Aerospace Jetstream 3100/3200 aircraft fitted with specified main landing-gear radius rods (left P/Ns 1847/A–/L; right P/Ns 1862/A–/L) to carry out the actions in BAE Systems Alert Service Bulletin ASB 32-A-JA010740 Revision 2 by 22 September 2001 (effective 22 August 2001). The measure responds to a manufacturing heat‑treatment error that can weaken radius rods and risk landing-gear collapse during abnormal events, so affected rods must be inspected/marked or removed per the service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods","history":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods/history","analysis":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods/analysis","conflicts":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods/conflicts","importantCases":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods/important-cases","documents":"/api/acts/ad-jetstream-91-main-landing-gear-radius-rods/documents"}}