{"id":"F2006B10893","name":"AD/JETSTREAM/25 - Electrical Power","slug":"ad-jetstream-25-electrical-power","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56428,"registerId":"commonwealth-F2006B10893-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/25 - Electrical Power","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/25 Electrical Power 8/88\n\nApplicability: Serial Nos 601 to 646, 648 to 655, 657, 658, 660 to 666, 668 to 695, 697 to 708, 710\n\nto 713, 715 to 741, 743 to 756, and 758 to 761.\n\n \n\nRequirement: Action in accordance with British Aerospace Jetstream 3100 SB 24-A-JM7631. Compliance:              Part A by 31 August 1988.\n\nPart B by 31 September 1988.\n\n \n\nBackground:  One operator reported an incident of arcing between the terminal tag of a cable and an adjacent busbar mounting bracket.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific electrical fault in specific aircraft. It has not expanded beyond its original purpose of mandating a known technical fix for a identified safety hazard."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Limited applicability scope (specific serial numbers listed)","Simple two-part compliance structure with fixed dates","No defined terms section, no cross-references to other legislation","Brief background explanation included","Note: Contains apparent typographical error ('31 September 1988' — September has 30 days)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific British Aerospace Jetstream 3100 aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Jetstream planes (serial numbers 601-646, 648-655, 657, 658, 660-666, 668-695, 697-708, 710-713, 715-741, 743-756, and 758-761) to carry out electrical system modifications\n- The work must follow British Aerospace Service Bulletin 24-A-JM7631\n\n**Why it matters:**\n- An operator reported dangerous electrical arcing (sparking) between a cable terminal and a nearby metal bracket\n- This creates fire and system failure risks in flight\n- The directive splits the fix into two parts with strict deadlines:\n  - **Part A:** Must be done by 31 August 1988\n  - **Part B:** Must be done by 31 September 1988 (note: this appears to be a typographical error as September only has 30 days)\n\n**Who it affects:**\n- Airlines and operators flying the specified Jetstream 3100 aircraft\n- Maintenance organisations servicing these planes\n\nNon-compliance would breach civil aviation safety regulations and could ground the aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument applies to the explicitly listed Jetstream 3100 serial numbers and requires the work in British Aerospace Jetstream 3100 SB 24-A-JM7631 by the two specified deadlines. There is no indication in the text that the AD expands or narrows that applicability relative to what it states; the scope is the serial-numbered aircraft listed under 'Applicability' and the actions in the referenced service bulletin. (Applicability; Requirement; Compliance)"},"complexity_factors":["Narrow technical scope limited to a single aircraft type and enumerated serial numbers (Applicability).","Mandatory compliance with an external manufacturer service bulletin (Requirement) rather than detailed steps embedded in the AD.","Two-part compliance timetable with distinct deadlines (Compliance).","Dependence on maintenance capacity and parts availability for implementation (implicit in Requirement).","Administrative necessity to track compliance for a set list of serial numbers (Applicability)."],"plain_english_summary":"What this instrument does (mechanical change)\n\n- The Civil Aviation Safety Authority (Schedule of Airworthiness Directives) requires operators of specific British Aerospace Jetstream 3100 aeroplanes to carry out the work called for in British Aerospace Jetstream 3100 Service Bulletin 24-A-JM7631. (Requirement)\n- The directive lists the individual aircraft by serial number. (Applicability)\n- It sets compliance deadlines: Part A by 31 August 1988, and Part B by 31 September 1988. (Compliance)\n\nWho it affects\n\n- Owners/operators of Jetstream 3100 aeroplanes with the serial numbers listed in the AD. (Applicability)\n- Maintenance organisations and engineers who must perform the work specified in the service bulletin. (Requirement)\n\nWhy it matters (official rationale, then assessment of effects)\n\n- The AD is issued because an operator reported an incident of electrical arcing between a cable terminal tag and an adjacent busbar mounting bracket. The AD therefore requires the corrective or preventive work described in the manufacturer’s service bulletin. (Background; Requirement)\n\nAssessment of incentives, costs, and implementation mechanics\n\n- Who pays: The immediate financial cost of compliance (labour, parts, and aircraft downtime) will fall on the aircraft owners/operators and the maintenance providers they engage, because the AD requires them to carry out the specified work. (Requirement; Applicability)\n- Who decides: The instrument prescribes a mandatory course of action (the service bulletin). The regulator (Civil Aviation Safety Authority, as the issuer of this Airworthiness Directive) sets the requirement and the deadlines. Operators decide how and when (subject to the deadlines) to schedule the work and which approved maintenance provider to use. (Requirement; Compliance)\n- Behaviour changes: Operators must schedule inspections/modifications per the service bulletin for applicable serial-numbered aircraft; they may reallocate maintenance slots, delay flights, or prioritise affected aircraft to meet the AD’s deadlines. (Requirement; Compliance)\n- Compliance burden and administrative cost: The AD creates a compliance task defined by an external document (the service bulletin). That typically translates into labour hours, replacement parts or minor modifications, and administrative tracking to ensure the deadlines are met. (Requirement)\n- Discretion and enforcement: The AD prescribes compliance with the manufacturer’s bulletin rather than leaving technical choices to operators. Enforcement discretion lies with the regulator to verify compliance with the AD. (Requirement)\n\nTrade-offs, risks and secondary effects to watch for\n\n- Concentrated benefit vs diffuse cost: The safety benefit of removing an arcing risk applies to the specific aircraft listed; the cost of performing the work is borne individually by the operators of those aircraft. (Applicability; Background)\n- Opportunity cost: Time and labour devoted to this AD’s work may displace other maintenance work or scheduled operations for affected aircraft while they are out of service. (Compliance)\n- Implementation risk: The AD cites an external technical document (the service bulletin). Effective implementation depends on the clarity and completeness of that bulletin and on availability of parts and approved maintenance capacity. (Requirement)\n- Timing sensitivity: The instrument sets two parts with discrete deadlines (Part A and Part B). Operators will need to sequence work to meet both deadlines. One compliance date is recorded as '31 September 1988' in the AD text. (Compliance)\n\nConcrete mechanism summary\n\n- The AD makes compliance with a specific manufacturer service bulletin mandatory for the listed aircraft by the dates stated. The stated purpose is to address an identified arcing incident between a cable terminal tag and a nearby busbar bracket; the mechanism is mandatory technical work applied to the listed serial-numbered aircraft. (Applicability; Requirement; Background)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-25-electrical-power","history":"/api/acts/ad-jetstream-25-electrical-power/history","analysis":"/api/acts/ad-jetstream-25-electrical-power/analysis","conflicts":"/api/acts/ad-jetstream-25-electrical-power/conflicts","importantCases":"/api/acts/ad-jetstream-25-electrical-power/important-cases","documents":"/api/acts/ad-jetstream-25-electrical-power/documents"}}