{"id":"F2006B10920","name":"AD/JETSTREAM/50 - Powerplant - Revised Power Lever To Manual Fuel Valve","slug":"ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56463,"registerId":"commonwealth-F2006B10920-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/50 - Powerplant - Revised Power Lever To Manual Fuel Valve","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n \n\nAD/JETSTREAM/50 Powerplant - Revised Power Lever\n\nTo Manual Fuel Valve\n\n\n12/91\n\n \n\nApplicability: All Jetstream 3100 and 3200 Aircraft construction numbers up to and including 928.\n\n \n\nRequirement: Action in accordance with the Technical requirements of British Aerospace Service Bulletin, CAA (UK) mandatory, 71-JM 7755.\n\n \n\nRequirement: Prior to 31 March 1992.\n\n \n\nCompliance:  There have been occurrences of the power lever becoming detached from the manual fuel valve on the engine. The resulting inability to control the power of the affected engine required the aircrew to initiate emergency procedures.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a particular airworthiness modification."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly used ('construction numbers' referring to aircraft serial numbers)","No cross-references to other legislation or regulations beyond a single external service bulletin reference","Simple conditional logic: single applicability criterion (aircraft model and serial number range) with single compliance deadline","No nested exceptions or conditional exemptions","Single operational requirement with clear technical reference to external standard"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) requiring specific repairs or modifications to aircraft.\n\n**What it does:** It orders owners and operators of British Aerospace Jetstream 3100 and 3200 aircraft (specifically those built up to construction number 928) to fix a dangerous mechanical fault. The problem is that the **power lever** (the pilot's throttle control that adjusts engine power) can detach from the **manual fuel valve** (the mechanical device that controls fuel flow to the engine). If this happens, pilots lose the ability to control engine power, forcing them to execute emergency procedures.\n\n**What must be done:** Aircraft operators must follow the technical instructions in British Aerospace Service Bulletin 71-JM 7755 (which was made mandatory by the UK Civil Aviation Authority) to modify or repair the connection between the power lever and fuel valve.\n\n**Deadline:** The fix must be completed before 31 March 1992.\n\n**Who it affects:** Anyone operating or maintaining Jetstream 3100 and 3200 series aircraft with serial numbers up to 928 — primarily regional airlines, charter operators, and maintenance organisations in Australia.\n\n**Why it matters:** This is a critical flight safety issue. Losing throttle control in flight is extremely dangerous, especially during takeoff, landing, or low-altitude operations. The directive prevents potential accidents by ensuring the mechanical linkage between pilot controls and engine fuel supply remains secure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope remains the same as stated: it applies to all BAe Jetstream 3100 and 3200 aircraft with construction numbers up to and including 928 and requires the modification per the specified service bulletin before 31 March 1992. There is no indication in the text supplied that the AD’s applicability or required actions were broadened or narrowed from that original specification (Applicability; Requirement; Requirement: Prior to 31 March 1992)."},"complexity_factors":["Narrow and specific technical scope: single aircraft type and serial‑number cutoff (Applicability).","Mandatory compliance tied to an external technical document (British Aerospace Service Bulletin CAA (UK) mandatory, 71-JM 7755) rather than full procedure text in the AD (Requirement).","Fixed compliance deadline creates scheduling pressure (Requirement: Prior to 31 March 1992).","Safety‑critical subject matter requiring certified maintenance action and potential aircraft downtime (Compliance; Requirement).","Limited information in the AD on costs, alternative compliance methods or operational exceptions (Requirement).","Cross‑jurisdictional reference (Australian AD enforcing a UK CAA/Manufacturer service bulletin) which can require liaison between operators, maintainers and regulators (Requirement)."],"plain_english_summary":"This AD requires modification of the power‑lever connection to the manual fuel valve on Jetstream 3100/3200 aeroplanes (c/n ≤ 928) per British Aerospace Service Bulletin 71‑JM‑7755, to be completed before 31 March 1992. CASA enforces it; owners/operators and maintenance organisations must arrange the work to prevent power‑lever detachment that can cause loss of engine power control and emergency procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve","history":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve/history","analysis":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve/analysis","conflicts":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve/conflicts","importantCases":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve/important-cases","documents":"/api/acts/ad-jetstream-50-powerplant-revised-power-lever-to-manual-fuel-valve/documents"}}