{"id":"F2006B10919","name":"AD/JETSTREAM/5 - Battery Temperature Monitor Unit - Inspection","slug":"ad-jetstream-5-battery-temperature-monitor-unit-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56462,"registerId":"commonwealth-F2006B10919-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/5 - Battery Temperature Monitor Unit - Inspection","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/5 Battery Temperature Monitor Unit - Inspection 7/85\n\nApplicability: Jetstream Series 3100 Aircraft: S/N 603, 610, 611, 615, 617-620, 622, 623, 627, 629,\n\n633, 645, 648, and 649.\n\n \n\nRequirement: Jetstream Service Bulletin 24-A-JA 850518. Compliance:  Within 100 hours time in service after 31 July 1985.\n\nBackground: A number of Battery Temperature Monitor Units have been found to have internal crossed electrical connections which can lead to wrong temperature information being presented to the pilots.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is limited to the listed Jetstream Series 3100 serial numbers and requires a one-off inspection per the referenced service bulletin within a defined flight-hour window. There is no indication in the supplied text that the scope has been changed from that original, narrow inspection requirement."},"complexity_factors":["Narrow and explicit applicability (specific aircraft serial numbers listed)","Single, specific action required (inspection) referenced to an external service bulletin","Fixed and simple compliance deadline (100 hours time in service after 31 July 1985)","Technical detail delegated to the service bulletin (not contained in the directive), requiring practitioners to consult an external document"],"plain_english_summary":"This directive mandates inspection of the Battery Temperature Monitor Unit on specified British Aerospace Jetstream Series 3100 aircraft (listed serial numbers), to be carried out per Jetstream Service Bulletin 24-A-JA 850518 within 100 hours time in service after 31 July 1985. \n\nIt affects the owners/operators of those serial-numbered aeroplanes, who must schedule and pay for the inspection aimed at finding and correcting internal crossed electrical connections that can give pilots incorrect temperature readings."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound airworthiness directive from 1985 addressing a specific manufacturing defect. It has not expanded beyond its original scope; it remains a targeted safety intervention for a defined fleet subset."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Limited applicability to 14 specific aircraft serial numbers only","Simple compliance deadline (100 hours time in service after fixed date)","No defined terms section, no cross-references to other legislation","Straightforward cause-and-effect: defect identified → inspection mandated","Document is essentially a one-page safety notice with minimal conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific British Aerospace Jetstream 3100 aircraft to inspect their **Battery Temperature Monitor Units**.\n\n**What the problem is:** Some of these units were manufactured with internal wiring errors (crossed electrical connections). This means the device could show the wrong temperature to pilots, potentially leading to unsafe battery conditions going undetected.\n\n**Who must comply:** Only specific aircraft serial numbers are affected (listed in the document: S/N 603, 610, 611, 615, 617-620, 622, 623, 627, 629, 633, 645, 648, and 649).\n\n**What must be done:** Operators must follow the instructions in **Jetstream Service Bulletin 24-A-JA 850518** — a technical repair notice from the manufacturer.\n\n**When:** The inspection must be completed within **100 hours of flight time** after 31 July 1985.\n\n**Why it matters:** This prevents potential battery failures or fires caused by incorrect temperature monitoring, protecting passengers, crew, and aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection","history":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection/history","analysis":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection/analysis","conflicts":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection/conflicts","importantCases":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection/important-cases","documents":"/api/acts/ad-jetstream-5-battery-temperature-monitor-unit-inspection/documents"}}