{"id":"F2006B03914","name":"AD/BEECH 400/12 - Standby Instrument Lighting Control","slug":"ad-beech-400-12-standby-instrument-lighting-control","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43523,"registerId":"commonwealth-F2006B03914-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 400/12 - Standby Instrument Lighting Control","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)  \nBeechcraft 400 Series Aeroplanes\n\nAD/BEECH 400/12 Standby Instrument Lighting Control 3/96\n\nApplicability: This Directive is applicable to Beechjet Model 400 aeroplane, serial number RJ-61 only; Model 400A aeroplanes, serial numbers RK-1 through RK-80 inclusive, and Model 400T aeroplanes, serial numbers TT-1 through TT-108 inclusive.\n\nRequirement: Modify the standby instrument lighting system in accordance with Beechcraft Mandatory Service Bulletin 2563 dated February 1995.\n\nNote. FAA AD 95-25-06 Amdt 39-9451 refers.\n\nCompliance: Within 200 hours time in service after 29 February 1996.\n\nBackground: The FAA has advised of a report indicating that, due to the design of the standby instrument lighting system, the lighting for the standby instruments dimmed to an unacceptable level when the main electrical power was turned off. The actions specified by this Directive are intended to ensure that the standby instrument lighting system adequately illuminates the standby instruments, if normal electrical power is lost or is turned off as a result of fire or smoke in the cockpit.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, one-off safety directive with no evidence of scope creep. It addresses a specific technical defect in a specific aircraft type and does not appear to have expanded beyond its original safety purpose."},"complexity_factors":["Extremely narrow scope: applies to only 189 specific aircraft by serial number","Single, unambiguous requirement: follow one named service bulletin","Simple compliance condition: time-in-service deadline with no nested exceptions","No defined terms section, no cross-references to other legislation beyond a single FAA AD reference","Background explanation is straightforward and non-technical","Total length is approximately 200 words"],"plain_english_summary":"This CASA Airworthiness Directive requires owners of specific Beechjet 400-series aircraft (one Model 400, serial RJ-61; 80 Model 400A, RK-1–RK-80; and 108 Model 400T, TT-1–TT-108) to modify the standby instrument lighting per Beechcraft Mandatory Service Bulletin 2563. \n\nThe change, to be done within 200 flight hours after 29 Feb 1996, fixes dimming of backup instruments so they remain readable during main electrical failures (e.g., fire or smoke), preserving safe flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive retains a narrow, corrective scope: it mandates a single modification for specified serial-numbered aeroplanes to address dimming of standby instrument lighting. It does not expand applicability beyond those serial numbers or introduce new operational restrictions; it enforces compliance with a manufacturer service bulletin within a fixed timeframe."},"complexity_factors":["Narrow applicability by specific models and serial numbers increases administrative tracking for affected owners/operators.","Mandated modification must follow an external document (Beechcraft Mandatory Service Bulletin 2563), creating dependency on manufacturer instructions.","Short compliance window (200 hours time in service from a fixed date) requires scheduling of maintenance into operational plans.","Safety-critical electrical modification may require certified maintenance personnel and replacement parts, adding direct cost and logistic burden.","Reference to an FAA AD (95-25-06) creates cross-jurisdictional regulatory alignment but adds an additional document to consult for technical context."],"plain_english_summary":"This airworthiness directive orders owners/operators of specific Beechjet Model 400, 400A and 400T aeroplanes (listed serial numbers) to modify the standby instrument lighting per Beechcraft Mandatory Service Bulletin 2563 (Feb 1995). The mechanical change ensures the standby lights remain adequately bright if the main electrical power is lost or switched off (for example, during fire or smoke). Compliance is required within 200 hours time in service after 29 February 1996; operators fund and schedule the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control","history":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control/history","analysis":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control/analysis","conflicts":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control/conflicts","importantCases":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control/important-cases","documents":"/api/acts/ad-beech-400-12-standby-instrument-lighting-control/documents"}}