COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 400 Series Aeroplanes AD/BEECH 400/5 Main Circuit Breaker Panel 1/94 DM Applicability: Model 400A aircraft with serials numbers RK-45 and RK-49 through RK-77 inclusive. Requirement: Action in accordance with Beechcraft Mandatory Service Bulletin 2520 dated August 1993 and Beechcraft Service Communique 400-101 dated July 1993. Note: FAA AD 93-20-01 Amdt 39-8708 refers. Compliance: Within 25 hours' time in service from 17 November 1993. Background: 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.