{"id":"F2006B10900","name":"AD/JETSTREAM/32 - Emergency Selector Valve","slug":"ad-jetstream-32-emergency-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56436,"registerId":"commonwealth-F2006B10900-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/32 - Emergency Selector 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/32 Emergency Selector Valve 6/89\n\nApplicability: All model Jetstream series 3100 aircraft.\n\n \n\nRequirement: Action in accordance with Jetstream Alert Service Bulletin No. 29-A-JA881143.\n\n \n\nNote: UK CAA AD 010-03-89 refers.\n\n \n\nCompliance: Within 300 hours TIS after 15 June 1989.\n\n \n\nBackground: Investigation of a flight incident in which the flaps and MLG emergency selector valve jammed, revealed that the valve internal nylon detent ball had distorted.\n\nReplacement of the nylon ball with one of stainless steel will ensure valve servicability.\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, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating a single safety modification."},"complexity_factors":["Single, specific mechanical component addressed","No defined terms section — uses standard aviation terminology only","Single compliance pathway with clear deadline (300 hours TIS)","No cross-references to other legislation or complex conditional logic","Refers to external technical document (Service Bulletin) for detailed instructions, keeping the AD itself brief","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of British Aerospace Jetstream 3100 series aircraft to replace a faulty nylon ball inside the emergency selector valve with a stainless steel one. This valve controls the flaps (the moving surfaces on wings that help with takeoff and landing) and the main landing gear (MLG) in emergency situations.\n\n**Why it matters:**\nA flight incident revealed that the original nylon ball could distort (change shape) and jam the valve. If this happens during an emergency, pilots might lose control of critical systems — potentially causing a crash during landing or an emergency situation.\n\n**Who must comply:**\nAnyone operating a Jetstream 3100 aircraft in Australia.\n\n**What they must do:**\nFollow the instructions in Jetstream Alert Service Bulletin No. 29-A-JA881143 to replace the nylon ball with a stainless steel one.\n\n**When:**\nWithin 300 hours of \"Time In Service\" (TIS — meaning actual flight hours) after 15 June 1989."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope does not change from its stated original intent in the text supplied: it mandates replacing the nylon detent ball in the emergency selector valve with a stainless steel ball on all Jetstream 3100 aircraft, to be done in accordance with the named service bulletin within 300 hours TIS after 15 June 1989 (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow technical scope: replacement of a single internal component (Background)","Applicability limited to a single aircraft family (All model Jetstream series 3100 aircraft) (Applicability)","Compliance tied to a measured operational metric (300 hours TIS after specified date) rather than a calendar date (Compliance)","Mandatory compliance by reference to an external technical document (Jetstream Alert Service Bulletin No. 29-A-JA881143) which operators must obtain (Requirement)","Practical dependence on parts availability and maintenance capacity (implied by Requirement and Background)","Regulatory provenance and enforcement sit within the Airworthiness Directives schedule, requiring recordkeeping and verification (header; Compliance)"],"plain_english_summary":"This airworthiness directive requires all British Aerospace Jetstream 3100 aircraft to have the emergency selector valve’s internal nylon detent ball replaced with a stainless‑steel ball, carried out per the manufacturer’s service bulletin within 300 hours TIS after 15 June 1989. It affects operators and maintenance organisations, who must arrange and pay for the work; the measure follows an incident where the nylon ball distorted and the valve jammed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-32-emergency-selector-valve","history":"/api/acts/ad-jetstream-32-emergency-selector-valve/history","analysis":"/api/acts/ad-jetstream-32-emergency-selector-valve/analysis","conflicts":"/api/acts/ad-jetstream-32-emergency-selector-valve/conflicts","importantCases":"/api/acts/ad-jetstream-32-emergency-selector-valve/important-cases","documents":"/api/acts/ad-jetstream-32-emergency-selector-valve/documents"}}