{"id":"F2006B10916","name":"AD/JETSTREAM/47 - Fuel Water-Drain-Valve Body Assembly","slug":"ad-jetstream-47-fuel-water-drain-valve-body-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56459,"registerId":"commonwealth-F2006B10916-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/47 - Fuel Water-Drain-Valve Body Assembly","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/47 Fuel Water-Drain-Valve Body Assembly 9/91 DM\n\nApplicability: All HP137 Mk 1 and Jetstream series 200 with modification 5269 incorporated, Jetstream series 3100 with modification JM5269 or JM 7552 incorporated or Jetstream series 3200 aircraft constructors numbers in the range 790 to 900.\n\nRequirement: Unless previously carried out; action in accordance with the Technical Requirements of British Aerospace SB 28-JM 5354.\n\nNote: This SB has been classified mandatory by the UK CAA.\n\nCompliance: 1. Part A of the Requirement Document by 31 August 1991.\n\n2. Part B of the Requirement Document by 31 December 1991.\n\nBackground: The manufacturer has advised that due to lack of positive locking between the existing valve body and the nut retainer assembly the valve body can loosen and become detached with consequent loss of fuel.","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 specific aircraft models. It has not expanded beyond its original purpose of mandating a fuel valve fix."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Limited applicability — only 4 specific aircraft variants/serial number ranges affected","Simple two-part compliance deadline structure","No nested exceptions, conditional logic, or extensive defined terms","Background and rationale clearly stated in plain language","Total length is extremely short (under 300 words)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific British Aerospace Jetstream aircraft.\n\n**What it does:**\nOrders owners and operators of certain Jetstream planes to inspect and fix a dangerous design flaw in the fuel system. The problem is that a valve in the fuel tank (the \"water-drain-valve body assembly\") can come loose because it lacks a proper locking mechanism. If this happens, fuel can leak out — creating a fire risk and potentially causing engine failure.\n\n**Who must comply:**\nOwners and operators of:\n- HP137 Mk 1 and Jetstream 200 series planes with modification 5269 installed\n- Jetstream 3100 series planes with modification JM5269 or JM7552 installed  \n- Jetstream 3200 series planes with serial numbers 790 through 900\n\n**What they must do:**\nFollow the technical instructions in British Aerospace Service Bulletin 28-JM 5354 (which the UK aviation regulator has declared mandatory). The work has two parts:\n- **Part A:** Must be completed by 31 August 1991\n- **Part B:** Must be completed by 31 December 1991\n\n**Why it matters:**\nThis is a critical safety fix. A loose fuel valve could cause fuel loss during flight, leading to engine failure or fire. The directive makes compliance legally compulsory — operators cannot fly these aircraft until the fix is done."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument implements the manufacturer’s corrective actions for a specific defect and sets fixed compliance deadlines. The text does not indicate any expansion or narrowing of scope beyond the stated applicability and required actions; it therefore appears consistent with its original corrective intent as expressed in the Background and Requirement sections."},"complexity_factors":["Narrow and clearly defined applicability (specific models and constructor numbers). (Applicability)","Single prescribed corrective document (British Aerospace SB 28-JM 5354) for required actions, limiting interpretive complexity. (Requirement)","Two fixed compliance deadlines (Part A and Part B) with no listed alternatives or extensions in the text. (Compliance)","No conditional exemptions, penalty provisions, or procedural options stated in the provided text—implementation depends on following the SB. (Requirement; Note)","Technical execution requires maintenance skills and parts, introducing operational complexity for affected operators but not legal/administrative complexity. (Requirement; Background)"],"plain_english_summary":"This directive requires owners/operators of specified British Aerospace Jetstream aircraft to carry out the inspection and repair actions in BA Service Bulletin SB 28-JM 5354 (mandated by the regulator) to fix a fuel drain‑valve locking defect that could lead to fuel loss. Parts A and B must be completed by the listed deadlines.\n\nCompliance is mandatory, enforced by the Civil Aviation Safety Authority, with owners/operators bearing costs, scheduling burdens, and limited discretion beyond the bulletin’s procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly","history":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly/history","analysis":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly/analysis","conflicts":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly/conflicts","importantCases":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly/important-cases","documents":"/api/acts/ad-jetstream-47-fuel-water-drain-valve-body-assembly/documents"}}