{"id":"F2006B03930","name":"AD/BEECH 400/3 - Electrical Wiring - Left-Hand Interstage Turbine Temperature Circuit Breaker","slug":"ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43539,"registerId":"commonwealth-F2006B03930-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 400/3 - Electrical Wiring - Left-Hand Interstage Turbine Temperature Circuit Breaker","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 400/3 Electrical Wiring \\- Left-Hand Interstage\n\nTurbine Temperature Circuit Breaker\n\n  \n5/93\n\nApplicability: Model 400A airplanes, with serial numbers RK-2 through RK-29 inclusive, RK-31 and RK-32.\n\nRequirement: Unless previously carried out, action in accordance with the Accomplishment Instructions of Beechcraft Mandatory Service Bulletin No 2458 (ATA Code 39-10) dated August 1992.\n\nNote: FAA AD 93-02-12 Amdt 39-8495 refers.\n\nCompliance: Within 100 hours time-in-service after 29 April 1993.\n\nBackground: The issue of this Directive is prompted by a recent report that, apparently during production, one of two bus wires was inadvertently connected to the incorrect side of a circuit breaker, leaving the circuit unprotected by the breaker. The action required by this Directive is intended to prevent the loss of standby power and the possibility of an electrical fire.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive is confined to specified Model 400A serial numbers and requires the service‑bulletin action within a set time. The text contains no indication that the applicability or obligations were broadened beyond that stated; therefore the scope has not changed from the Directive's stated purpose."},"complexity_factors":["Narrow applicability: specific Model 400A serial numbers (RK-2 through RK-29, RK-31 and RK-32) — limits affected parties.","Mandated reliance on an external technical document: Beechcraft Mandatory Service Bulletin No. 2458 (ATA 39-10).","Compliance timeframe: within 100 hours time-in-service after 29 April 1993.","Technical nature of required work: electrical wiring correction to circuit breaker bus connections (safety‑critical maintenance).","Regulatory cross-reference: note referring to FAA AD 93-02-12, indicating related international regulatory action."],"plain_english_summary":"**What it does:** This Airworthiness Directive requires owners/operators of specified Beechcraft 400A aeroplanes (serial numbers RK-2 to RK-29, RK-31 and RK-32) to correct the left‑hand interstage turbine temperature circuit breaker wiring by carrying out the actions in *Beechcraft Mandatory Service Bulletin No. 2458 (ATA 39‑10).*  \n\n**Why it matters:** The fix must be done within 100 hours time‑in‑service after 29 April 1993 to prevent loss of standby power and to reduce the risk of an electrical fire."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in specific aircraft. It has not expanded beyond its original purpose of mandating a wiring correction."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement (comply with external service bulletin)","No defined terms section","No cross-references to other legislation beyond a single FAA AD citation","Simple conditional structure: single applicability test (specific serial numbers) and single compliance deadline","Background explanation is narrative and straightforward"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific Beechcraft 400A airplanes (serial numbers RK-2 through RK-29, plus RK-31 and RK-32).\n\n**What the problem is:** During manufacturing, a wiring mistake was made. One of two important electrical wires was connected to the wrong side of a circuit breaker. This meant the circuit wasn't actually protected by the breaker — so if something went wrong, the breaker wouldn't trip to cut power. This could cause two serious problems: loss of standby power (backup electricity) or even an electrical fire.\n\n**What must be done:** Owners or operators of these specific aircraft must follow the repair instructions in Beechcraft's Mandatory Service Bulletin No. 2458. This involves fixing the wiring so the circuit breaker actually protects the circuit.\n\n**When it must be done:** Within 100 hours of flying time after 29 April 1993.\n\n**Why it matters:** This is a safety-critical fix. Without it, a single electrical fault could disable backup power systems or start a fire in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker","history":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker/history","analysis":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker/analysis","conflicts":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker/conflicts","importantCases":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker/important-cases","documents":"/api/acts/ad-beech-400-3-electrical-wiring-left-hand-interstage-turbine-temperature-circuit-breaker/documents"}}