{"id":"F2006B10880","name":"AD/JETSTREAM/12 - D.C. Power Distribution System","slug":"ad-jetstream-12-d-c-power-distribution-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56401,"registerId":"commonwealth-F2006B10880-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/12 - D.C. Power Distribution System","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/12 D.C. Power Distribution System 11/85\n\nApplicability: Jetstream Series 3100 aircraft with S/Nos. 601 through 659. Requirement: British Aerospace Service Bulletin 24-A-JA850648.\n\nNote: The British Civil Aviation Authority have classified this Service Bulletin as mandatory.\n\n \n\nCompliance: Within 200 hours time in service after 30 November 1985.\n\n \n\nBackground:  The manufacturer advises that insufficient clearance may exist between components mounted at Station 130 on the right hand bulkhead. The area is inspected and modified as required by the referenced Service Bulletin.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD defines a focused scope: it applies only to Jetstream Series 3100 aircraft with serial numbers 601–659 and requires compliance with a single referenced Service Bulletin within a specified time window (\"Applicability\"; \"Requirement\"; \"Compliance\"). The instrument adopts the manufacturer’s identified concern about clearance at Station 130 (\"Background\") and does not expand the range of affected models, actions, or the remedy beyond that referenced Service Bulletin. Therefore there is no change of scope from the stated remedy in the AD itself."},"complexity_factors":["Narrow, specific applicability to Jetstream Series 3100 S/Ns 601–659 (low scope breadth).","Clear, single compliance action: follow a specific Service Bulletin (straightforward obligation).","External technical detail not included in the AD: the remedy is contained in the referenced Service Bulletin, requiring access to that document.","Fixed compliance timeframe (200 hours TIS after 30 Nov 1985) creates a scheduling constraint but not conditional complexity.","Regulatory cross-reference: British CAA classification noted, but the AD itself sets the compliance requirement (minor added procedural linkage)."],"plain_english_summary":"### What this instrument does (mechanically)\n\nThis Airworthiness Directive (AD/JETSTREAM/12) requires operators of British Aerospace Jetstream Series 3100 aeroplanes with serial numbers 601–659 to inspect, and modify if necessary, the D.C. power distribution area at Station 130 on the right-hand bulkhead. The work must be done in accordance with British Aerospace Service Bulletin 24-A-JA850648 (\"Requirement\") and completed within 200 hours time in service after 30 November 1985 (\"Compliance\"). The AD records that the manufacturer advised there may be insufficient clearance between components mounted at Station 130 on the right-hand bulkhead (\"Background\"). The British Civil Aviation Authority has classified that Service Bulletin as mandatory (\"Note\").\n\n### Who is affected\n\n- Aircraft owners/operators of Jetstream Series 3100 with S/Ns 601–659 (\"Applicability\").\n- Maintenance organisations contracted to carry out the inspection and any modifications required by the referenced Service Bulletin (\"Requirement\").\n\n### Why it matters (stated purpose and practical consequence)\n\n- Stated purpose: the manufacturer advised a potential physical clearance problem in the D.C. power distribution area (\"Background\").\n- Practical consequence: owners/operators must obtain and carry out the referenced Service Bulletin work within the stated time limit (\"Requirement\"; \"Compliance\"). Failure to comply would be non‑compliance with the AD.\n\n### Who pays, who decides, and what behaviour changes\n\n- Who pays: the operator/owner who must fund the inspection and any modification required by Service Bulletin 24-A-JA850648 (implied by the requirement to carry out the work).\n- Who decides: the AD makes compliance mandatory in Australia by reference to the Service Bulletin; the British CAA has also classified the Service Bulletin as mandatory (\"Note\"), and the AD sets the compliance deadline (\"Compliance\").\n- Behaviour change required: operators must schedule maintenance to perform the inspection/modification within the specified 200 hours TIS window and follow the technical instructions in the Service Bulletin (\"Requirement\").\n\n### Costs, incentives, and implementation notes (mechanical effects and trade‑offs)\n\n- Compliance cost and operational impact: the AD imposes a maintenance task and associated labour, possible parts and aircraft downtime. The AD does not list labour hours or parts; those details are in the referenced Service Bulletin (\"Requirement\").\n- Technical discretion and reliance: the AD does not itself describe the technical steps; it requires following the external Service Bulletin, so compliance depends on obtaining and applying that document (\"Requirement\").\n- Enforcement and timing risk: the AD sets a clear compliance window (200 hours TIS after 30 November 1985) which operators must meet; the AD leaves the exact technical solution to the Service Bulletin (\"Compliance\"; \"Requirement\").\n\n### Trade-offs and potential side effects (mechanisms, not judgements)\n\n- Concentrated benefit: the direct, concentrated benefit accrues to operators of the specified serial-numbered aircraft who have the specified clearance issue because the specified work addresses that physical arrangement (\"Applicability\"; \"Background\").\n- Diffuse cost: cost is carried by each affected operator in the form of maintenance expense and aircraft downtime; the AD does not specify funding or compensation (\"Requirement\").\n- Substitution effects: operators may need to reallocate maintenance slots, delay other work, or source parts/services to comply (implicit from the need to perform the Service Bulletin work).\n- Implementation risk: because the AD refers to an external Service Bulletin for the technical remedy, correct compliance depends on access to and correct application of that Bulletin (\"Requirement\").\n\n(Quoted source phrases: \"Applicability: Jetstream Series 3100 aircraft with S/Nos. 601 through 659\"; \"Requirement: British Aerospace Service Bulletin 24-A-JA850648\"; \"Note: The British Civil Aviation Authority have classified this Service Bulletin as mandatory\"; \"Compliance: Within 200 hours time in service after 30 November 1985\"; \"Background: The manufacturer advises that insufficient clearance may exist between components mounted at Station 130 on the right hand bulkhead.\")"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1985 addressing a specific technical defect in a limited aircraft population. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Single, specific applicability criterion (serial number range)","One clear compliance requirement referencing an external technical document","No defined terms section","No conditional logic or nested exceptions","Straightforward deadline calculation (200 hours after fixed date)","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific type of aircraft.\n\n**What it does:**\n- Requires owners and operators of certain British Aerospace Jetstream 3100 aircraft (serial numbers 601–659) to inspect and potentially modify the electrical power distribution system\n- Specifically addresses a clearance problem between components near a structural point called \"Station 130\" on the right-hand bulkhead\n\n**Who it affects:**\n- Operators of Jetstream 3100 aircraft with serial numbers 601 through 659\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- The manufacturer identified that electrical components may be positioned too close together, creating a potential safety risk\n- The British aviation regulator classified this as mandatory, and Australia has adopted the same requirement\n- Aircraft must comply within 200 flight hours after 30 November 1985\n\n**What must be done:**\n- Follow British Aerospace Service Bulletin 24-A-JA850648\n- Inspect the area and make modifications if needed"}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-12-d-c-power-distribution-system","history":"/api/acts/ad-jetstream-12-d-c-power-distribution-system/history","analysis":"/api/acts/ad-jetstream-12-d-c-power-distribution-system/analysis","conflicts":"/api/acts/ad-jetstream-12-d-c-power-distribution-system/conflicts","importantCases":"/api/acts/ad-jetstream-12-d-c-power-distribution-system/important-cases","documents":"/api/acts/ad-jetstream-12-d-c-power-distribution-system/documents"}}