COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus PC-12 Series Aeroplanes AD/PC-12/3 Amdt 1 Electrical Wiring 3/97 Applicability: All PC-12 aeroplanes up to and including serial number 140. Requirement: Unless previously accomplished, modify in accordance with Pilatus Aircraft Ltd PC- 12 Service Bulletin 24-003 Revision 1 dated 18 September 1996. Note: FOCA Switzerland AD HB 97-002 refers. Compliance: Prior to 31 March 1997. This Amendment takes effect on 27 February 1997. Background: The Swiss Federal Office for Civil Aviation (FOCA) has advised that when the N ESNTL switch is set to AUTO the NON ESSENTIAL BUS may not automatically disconnect from the power distribution system when the BAT/GEN 1 bus tie circuit breaker (CB210) opens. Additionally FOCA has advised that reports have been received of incorrect wiring of the KN-40 Navigation Converter. This amendment introduces a revision to the Requirement Document which corrects a wiring error in the original issue of the document. The original issue of this Directive, mandated a wiring change, which eliminated the condition whereby the NON ESSENTIAL BUS remained connected, and an inspection of the KN-40 wiring. The original issue of this Airworthiness Directive became effective on 7 November 1996.