COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piaggio P166 Series Aeroplanes AD/P166/8 Emergency Electrical Bus - Modification NK Applicability: S/Nos. prior to 409. Document: 1. Provide two separate feeds from the main bust to the emergency bus with a common connection at the switch and separate connections at the emergency bus. 2. Aeroplanes not fitted with a continuous unbroken emergency bus shall be modified by providing pitot heat, VHF, fire warning, stall warning and turn the bank indicator circuits with an additional alternative cable loop between their circuit breakers and the emergency bus. Compliance: Forthwith.