{"id":"F2006B10884","name":"AD/JETSTREAM/17 Amdt 3 - Elevator Trim Servo Cable P/N 137187E472","slug":"ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56409,"registerId":"commonwealth-F2006B10884-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/17 Amdt 3 - Elevator Trim Servo Cable P/N 137187E472","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/17\n\nAmdt 3\n\n  \n\nElevator Trim Servo Cable P/N 137187E472\n\n  \n11/97\n\nApplicability: All Jetstream Series 3100 aircraft, with Sperry SPZ-200B autopilot installed.\n\nJetstream Series 3100 aircraft, with Sperry SPZ-500 autopilot installed, excluding aircraft that have autopilot installed under Customer Requirement Kit JK2864 (Service Bulletin 34-JK2864).\n\nRequirement: Action in accordance with Jetstream Alert Service Bulletin 22-A-JA 861023 Revision 3. This Alert Service Bulletin has been classified mandatory by the UK CAA.\n\nNote: Jetstream SB 27-JK 12006 introduced a new cable with a life limitation of 4,000 hours time in service.\n\nCompliance: As specified in Part J of the requirement document.\n\nBackground: The manufacturer reported a case of cable failure that left the trim tab in an irreversible position whilst giving a cockpit indication that all was normal. Amendment 1 reduced the cable life limit from 2,000 hours to 1,000 hours. Amendment 2 introduced an improved 7x19 elevator trim cable with an increased life limit.\n\nAmendment 3 is issued in response to a revision of the requirement document which clarifies both the applicability and compliance requirements.\n\nAmendment 2 of this airworthiness directive became effective on 12 October 1995\\. Amendment 1 of this airworthiness directive became effective on 17 January 1989\\. The original issue of this airworthiness directive became effective on\n\n18 December 1986.","sortOrder":0}],"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":5,"scope_assessment":{"changed":false,"description":"Amendment 3 clarifies applicability and compliance requirements of the existing directive rather than expanding or narrowing the fleet or subject matter. The AD continues to address the same elevator trim servo cable failure risk and relies on the same service bulletin (22‑A‑JA 861023 Rev 3) and Part J for compliance."},"complexity_factors":["Targeted technical scope: safety‑critical aircraft part (elevator trim servo cable) requiring precise maintenance action.","Conditional applicability: different rules for aircraft with Sperry SPZ‑200B versus SPZ‑500 autopilots and an exception for aircraft modified under Customer Requirement Kit JK2864.","Cross‑reference to external documents: mandatory action is defined by Jetstream Alert Service Bulletin 22‑A‑JA 861023 Rev 3 and compliance is specified in its Part J, creating dependence on that external text.","Evolving technical limits across amendments: life‑limit changes (2000→1000→improved cable with 4000h) require tracking historical amendments for correct part/life usage.","Safety consequence sensitivity: failure mode leaves trim tab irreversible while cockpit indicates normal, increasing urgency and inspection burden.","Regulatory layering: classification by UK CAA and issuance under Australian AD process adds inter‑jurisdictional reference points and possible administrative coordination."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of British Aerospace Jetstream Series 3100 aircraft with Sperry SPZ‑200B (and some SPZ‑500) autopilots to carry out the inspections/parts actions set out in Jetstream Alert Service Bulletin 22‑A‑JA 861023 Revision 3. The AD responds to a reported elevator‑trim servo cable failure that could leave the trim tab fixed despite normal cockpit indications; earlier amendments adjusted cable life limits and introduced an improved 7x19 cable. Compliance details are specified in Part J of the requirement document."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose — addressing elevator trim servo cable safety on specific Jetstream 3100 aircraft. Amendment 3 does not expand the scope; it merely clarifies applicability and compliance requirements in response to a revised manufacturer service bulletin. The core safety issue (cable failure risk) and affected aircraft population remain consistent with the original 1986 directive."},"complexity_factors":["Multiple amendments (3 versions) with cross-referenced effective dates creating historical tracking requirements","Nested applicability exclusions: applies to SPZ-500 autopilot aircraft EXCEPT those installed under specific Customer Requirement Kit JK2864","External document dependency: compliance requires reference to separate Jetstream Alert Service Bulletin 22-A-JA 861023 Revision 3, which is not reproduced in the directive itself","Cross-reference to UK CAA (foreign regulator) classification as mandatory","Part-number specific hardware identification (P/N 137187E472) requiring technical documentation matching"],"plain_english_summary":"This AD mandates inspection or replacement of the elevator trim servo cable (PN 137187E472) on certain British Aerospace Jetstream 3100s equipped with Sperry SPZ‑200B or SPZ‑500 autopilots (with a specified kit exception). Operators must comply with Jetstream Alert Service Bulletin 22‑A‑JA 861023 Rev 3. This third amendment updates the referenced service instructions; it addresses a known cable failure mode that can jam the trim tab without cockpit indication, posing a serious flight-safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472","history":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472/history","analysis":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472/analysis","conflicts":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472/conflicts","importantCases":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472/important-cases","documents":"/api/acts/ad-jetstream-17-amdt-3-elevator-trim-servo-cable-p-n-137187e472/documents"}}