{"id":"F2010L02867","name":"AD/JETSTREAM/108 - Flap Torque Shaft Assembly","slug":"ad-jetstream-108-flap-torque-shaft-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84832,"registerId":"commonwealth-F2010L02867-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 3100 (Jetstream) S","sectionType":"division","heading":"British Aerospace BAe 3100 (Jetstream) Series Aeroplanes","content":"### British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n| AD/JETSTREAM/108 | Flap Torque Shaft Assembly | 22/2010 |\n| ---------------- | -------------------------- | ------- |\n\n| Applicability: | All HP137 Mk 1, Jetstream Series 200 and Jetstream Series 3100 aircraft.                                                                                              |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Retire flap torque shaft assemblies in accordance with Jetstream Service Bulletin27-JA840421 or later revision.Note: UK CAA AD 009-02-86 refers.                      |\n| Compliance:    | Before exceeding 18,000 landings or equivalent as specified in the Requirement document.                                                                              |\n|                | This Airworthiness Directive becomes effective on 19 November 2010.                                                                                                   |\n| Background:    | Continued testing of the fatigue test airframe has shown the need to limit thein-service life of the flap torque shaft assembly to 18,000 landings or its equivalent. |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n26 October 2010","sortOrder":0},{"sectionNumber":"AD/JETSTREAM/108","sectionType":"part","heading":"AD/JETSTREAM/108","content":"## AD/JETSTREAM/108","sortOrder":1},{"sectionNumber":"Flap Torque Shaft Assembly","sectionType":"part","heading":"Flap Torque Shaft Assembly","content":"## Flap Torque Shaft Assembly","sortOrder":2},{"sectionNumber":"22/2010","sectionType":"part","heading":"22/2010","content":"## 22/2010","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive focused on a single mechanical component. It matches the typical scope of ADs — addressing specific safety-critical findings from fatigue testing. No scope creep detected."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive requirement with clear numeric threshold (18,000 landings)","Single cross-reference to external technical document (Service Bulletin 27-JA840421)","No defined terms section — uses standard aviation terminology","No conditional logic, exceptions, or nested provisions","Straightforward applicability clause covering specific aircraft models by name"],"plain_english_summary":"This Airworthiness Directive from CASA mandates that operators of HP137 Mk 1, Jetstream Series 200 and Series 3100 aircraft must retire and replace the flap torque shaft assembly before it reaches 18,000 landings. Fatigue testing shows the part can fail and affect flap control; compliance with Jetstream Service Bulletin 27-JA840421 (or later) is required and legally binding."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Background material states continued fatigue testing showed the need to limit the in‑service life of the flap torque shaft assembly to 18,000 landings. The AD therefore imposes a new, mandatory life limit where none was specified in the text of this instrument previously, requiring operators to retire parts at that threshold (Background; Requirement)."},"complexity_factors":["Clear numeric life-limit (18,000 landings) makes the core rule operationally simple but creates a strict compliance trigger (Compliance).","Applicability is narrow but fleet‑wide for specified models, so many operators must act (Applicability).","Work instructions and procedures are delegated to an external Jetstream Service Bulletin (27‑JA840421) and allow use of later revisions, adding document‑management and update tracking responsibilities (Requirement).","\"Equivalent\" life metric is referenced but not defined in the AD text, requiring operators to interpret or locate conversion rules in the Requirement document–raising recordkeeping and calculation burdens (Compliance).","Cross‑reference to UK CAA AD 009‑02‑86 creates an international compliance linkage that may affect operators managing multi‑jurisdiction fleets (Requirement Note).","Mandatory timing (‘before exceeding 18,000 landings’) forces scheduling of maintenance and potential aircraft downtime, with direct cost and operational planning impacts (Compliance).","Background basis (fatigue testing) changes the maintenance standard from implicit to explicit life‑limit policy, creating retroactive lifecycle management for in‑service parts (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of HP137 Mk 1, Jetstream Series 200 and Series 3100 aeroplanes to retire (replace) flap torque shaft assemblies once they reach 18,000 landings or an equivalent measure, following Jetstream Service Bulletin 27‑JA840421 (or later). The change is driven by fatigue testing that identified a required life limit (Background); operators must schedule and pay for the replacements and maintain landing‑count records to meet the deadline."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly","history":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly/history","analysis":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly/analysis","conflicts":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly/conflicts","importantCases":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly/important-cases","documents":"/api/acts/ad-jetstream-108-flap-torque-shaft-assembly/documents"}}