{"id":"F2006B10935","name":"AD/JETSTREAM/65 - Wing - Main Landing Gear Bay Doublers","slug":"ad-jetstream-65-wing-main-landing-gear-bay-doublers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56483,"registerId":"commonwealth-F2006B10935-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/65 - Wing - Main Landing Gear Bay Doublers","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/65 Wing \\- Main Landing Gear Bay Doublers 10/94\n\nApplicability: Jetstream 3200 series aircraft up to and including constructor’s number 969.\n\nRequirement: 1. Inspect the joggled doubler at the forward edge of the left and right hand main landing gear bays in accordance with Part 1 of British Aerospace SB 57-A- JA920540.\n\n2. Install new doublers in accordance with Part 2 or Part 3 (depending on modification status) of British Aerospace SB 57-A-JA920540.\n\nCompliance: 1. Initially inspect pre mod JM 8122 aircraft before 4000 flying hours or within 200 flying hours from 15 September 1994 whichever occurs last.\n\nReinspect at 600 flying hour intervals until modified in accordance with Requirement para 2.\n\n2. Modify pre mod JM 8122 and JM 8195 aircraft before 9000 flying hours.\n\nModification in accordance with British Aerospace SB 57-A-JA920540 cancels the inspection requirement of this AD.\n\nBackground: Cracks were experienced during fatigue testing, the inspection is required to detect cracking and the modification will improve the fatigue life of the structure.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrowly-targeted Airworthiness Directive addressing a specific structural fatigue issue in a specific aircraft type. The scope remains precisely limited to the identified safety defect and mandated corrective actions."},"complexity_factors":["Short, single-purpose instrument (approximately 250 words)","Only 4 defined applicability criteria (aircraft series, constructor's number range, two specific modifications)","Clear two-stage compliance structure (inspect, then modify)","Simple conditional logic based on modification status (pre-mod JM 8122 vs JM 8195)","Single external reference to British Aerospace Service Bulletin SB 57-A-JA920540","No nested exceptions or complex cross-referencing within the instrument itself"],"plain_english_summary":"This mandatory CASA Airworthiness Directive targets British Aerospace Jetstream 3200 aircraft (serials up to 969) after fatigue testing found cracks in metal wing doubler plates near the main landing gear bays. It requires operators to inspect those doublers regularly to detect cracking and to replace them with improved parts to restore structural integrity. It affects anyone operating the specified Jetstream 3200s and aims to prevent wing failure by \"find it and fix it.\""},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD explicitly applies to Jetstream 3200 series aircraft up to constructor's number 969 and prescribes inspection and modification actions for the main landing gear bay doublers. The text contains no indication that the applicability or core requirements were broadened or narrowed from the instrument’s stated purpose; the modification simply replaces the recurring inspection obligation for affected airframes."},"complexity_factors":["Requires following a manufacturer service bulletin (British Aerospace SB 57-A-JA920540) with distinct Parts 1–3, not reproduced in the AD.","Conditional actions: which Part of the service bulletin to follow depends on aircraft modification status.","Multiple compliance timing rules (initial inspection: before 4000 flying hours or within 200 hours from 15 Sep 1994, reinspect every 600 hours until modification).","Different modification deadlines for aircraft with specific prior mods (pre mod JM 8122 and JM 8195 require modification before 9000 flying hours).","Applicability limited to Jetstream 3200 series up to constructor’s number 969 — operators must identify affected airframes.","Modification cancels the inspection requirement, creating a tracking requirement to record when an airframe is ‘modified’ for compliance relief."],"plain_english_summary":"This airworthiness directive requires operators of British Aerospace Jetstream 3200 aeroplanes (constructor numbers up to 969) to inspect the joggled doubler at the forward edge of each main landing gear bay and to install new doublers as set out in the referenced British Aerospace service bulletin. The inspection seeks fatigue cracks found in testing; completing the modification cancels the recurring inspections and is intended to extend the structure’s fatigue life."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers","history":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers/history","analysis":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers/analysis","conflicts":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers/conflicts","importantCases":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers/important-cases","documents":"/api/acts/ad-jetstream-65-wing-main-landing-gear-bay-doublers/documents"}}