{"id":"F2006B03667","name":"AD/BEECH 1900/9 - Electrical Power - Hot Battery Bus","slug":"ad-beech-1900-9-electrical-power-hot-battery-bus","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43257,"registerId":"commonwealth-F2006B03667-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 1900/9 - Electrical Power - Hot Battery Bus","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 1900 Series Aeroplanes\n\nAD/BEECH 1900/9 Electrical Power \\- Hot Battery Bus 13/94\n\nDM\n\nApplicability: Model Serial Numbers\n\n1900 UA-2 and UA-3\n\n1900C UB-1 to UB-74 and UC-1 to UC-174 both inclusive 1900D UE-1 to UE-87 inclusive\n\nRequirement: Action in accordance with Beechcraft Mandatory Service Bulletin 2562 dated August 1994.\n\nNote: FAA AD 94-20-05 Amdt 39-9033 refers.\n\nCompliance: Within 50 hours time in service from 19 October 1994.\n\nBackground: Beechcraft have advised the FAA that they received a report of the hot battery bus bar wrongly installed on the lower (load) side of the hot battery bus fuse assembly in a Beech 1900 series aircraft (correct installation is on the upper (power) side of the circuit). This incorrect installation does not provide adequate overload protection to circuits connected to the hot battery bus, this condition if not detected and corrected could result in loss of all electrical power to all emergency equipment connected to the hot battery bus. Inspections and modification of the electrical circuit required by this Directive will ensure adequate overload protection of circuits connected to the hot battery bus.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, one-off safety directive addressing a specific manufacturing defect. It has not expanded beyond its original purpose of correcting a known wiring fault in specific Beechcraft aircraft."},"complexity_factors":["Single, specific technical requirement referencing an external document (Beechcraft Service Bulletin)","No defined terms section — uses standard aviation terminology","Simple conditional structure: if your aircraft is in the listed serial numbers, you must comply","No nested exceptions or cross-references to other legislation beyond a note about the corresponding FAA directive","Extremely short document (under 200 words of substantive text)"],"plain_english_summary":"Australia's CASA requires owners/operators of certain Beechcraft 1900, 1900C and 1900D aeroplanes to inspect and, if needed, correct an incorrectly installed \"hot battery bus\" that bypasses a protective fuse. Following Beechcraft Mandatory Service Bulletin 2562 within 50 flight hours after 19 Oct 1994 is mandatory. The fix prevents an overload from causing total loss of power to critical emergency systems."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is narrowly focused on correcting the hot battery bus bar installation on the listed Beechcraft 1900 serial numbers by inspection and modification per Beechcraft Mandatory Service Bulletin 2562, to be completed within 50 hours time-in-service. There is no text suggesting the scope was broadened or narrowed from the stated corrective purpose. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Narrow applicability limited to specific model serial numbers (Applicability).","Requires technical electrical inspection and possible modification to the hot battery bus (Requirement; Background).","Mandates following a manufacturer Mandatory Service Bulletin (Beechcraft MSB 2562) — reliance on external technical documentation (Requirement).","Short compliance window: within 50 hours time-in-service from a fixed date, creating scheduling pressure (Compliance).","Cross-reference to FAA AD 94-20-05 introduces inter-jurisdictional regulatory linkage (Background).","Costs and operational impact fall on aircraft operators/owners: parts, labour and downtime (Requirement; Compliance)."],"plain_english_summary":"This airworthiness directive requires inspection and, if necessary, modification of the hot battery bus installation on specified Beechcraft 1900 serial numbers to correct a wrongly installed bus bar and restore overload protection to emergency circuits. (Applicability; Requirement; Background)\n\nThe Civil Aviation Safety Authority requires compliance within 50 hours time-in-service from 19 October 1994 by following Beechcraft Mandatory Service Bulletin 2562. Operators/owners must bear the maintenance, parts and aircraft downtime to complete the inspection/modification. (Compliance; Requirement; Background)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus","history":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus/history","analysis":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus/analysis","conflicts":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus/conflicts","importantCases":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus/important-cases","documents":"/api/acts/ad-beech-1900-9-electrical-power-hot-battery-bus/documents"}}