{"id":"F2006B03932","name":"AD/BEECH 400/5 - Main Circuit Breaker Panel","slug":"ad-beech-400-5-main-circuit-breaker-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43541,"registerId":"commonwealth-F2006B03932-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 400/5 - Main Circuit Breaker Panel","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)  Beechcraft 400 Series Aeroplanes\n\n \n\nAD/BEECH 400/5 Main Circuit Breaker Panel 1/94\n\nDM\n\n \n\nApplicability: Model 400A aircraft with serials numbers RK-45 and RK-49 through RK-77 inclusive.\n\n \n\nRequirement: Action in accordance with Beechcraft Mandatory Service Bulletin 2520 dated August 1993 and Beechcraft Service Communique 400-101 dated July 1993.\n\n \n\nNote: FAA AD 93-20-01 Amdt 39-8708 refers.\n\n \n\nCompliance: Within 25 hours’ time in service from 17 November 1993.\n\n \n\nBackground:  Beechcraft have advised of anomalies in the main circuit breaker panel wiring and that there is a possibility for an electrical short to occur. Compliance with this Directive will decrease the probability of an electrical short causing fire and smoke in the cockpit.\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":3,"scope_assessment":{"changed":false,"description":"Scope remains a targeted corrective requirement for specific Model 400A serial numbers to fix main circuit breaker panel wiring. The directive mandates following manufacturer service instructions within a short timeframe and does not broaden applicability beyond those serials or add new regulatory powers."},"complexity_factors":["Narrow applicability by specific serial numbers (RK-45 and RK-49 through RK-77) limits affected fleet size but requires serial verification.","Mandatory reliance on external manufacturer documents (Beechcraft Mandatory Service Bulletin 2520 and Service Communique 400-101) for corrective steps.","Short compliance window: must be completed within 25 hours’ time in service from a fixed calendar date (17 November 1993).","Safety-critical electrical wiring work to reduce risk of short, fire or smoke increases technical and procedural compliance requirements.","Cross-reference to FAA AD 93-20-01 indicates alignment with foreign regulator action and may affect record-keeping or conformity assessments.","Compliance cost and operational downtime fall to aircraft owners/operators; implementation logistics (scheduling, parts, labour) create administrative burden."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of certain Beechcraft 400A aeroplanes (serial RK-45 and RK-49 through RK-77) to perform wiring corrections to the main circuit breaker panel as set out in Beechcraft Mandatory Service Bulletin 2520 and Service Communique 400-101. It must be done within 25 hours’ time in service from 17 November 1993. The stated purpose is to reduce the chance of an electrical short that could cause fire or smoke in the cockpit; the operator bears the cost and must implement the manufacturer’s instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific scope (particular serial numbers of one aircraft model). It has not expanded beyond its original purpose of addressing a specific wiring defect."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability criteria (model type and serial number range)","Single, unambiguous compliance action (follow two referenced documents)","Clear deadline (25 hours time in service from fixed date)","No nested conditions, exceptions, or cross-references to other legislation","Background explanation provided in plain language"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) requiring specific aircraft owners to fix a dangerous electrical wiring problem.\n\n**Who it affects:** Owners and operators of specific **Beechcraft 400A business jets** — specifically those with serial numbers RK-45 and RK-49 through RK-77.\n\n**What it requires:** These aircraft must have their **main circuit breaker panel** inspected and repaired following two official Beechcraft technical documents (a Mandatory Service Bulletin and a Service Communique). The work must be done **within 25 flight hours** after 17 November 1993.\n\n**Why it matters:** Beechcraft discovered wiring defects that could cause **electrical short circuits**, potentially leading to **fire and smoke in the cockpit**. This directive forces operators to fix the problem before it causes an accident.\n\n**Key point:** This is not optional — \"Airworthiness Directives\" are legally binding safety orders. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel","history":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel/history","analysis":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel/analysis","conflicts":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel/conflicts","importantCases":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel/important-cases","documents":"/api/acts/ad-beech-400-5-main-circuit-breaker-panel/documents"}}