COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/29 Pitot Static Heaters 10/90 Applicability: SD3-60 aircraft S/No's SH3601 to SH3760 inclusive. Requirement: Shorts SD3-60 SB SD360-24-18. Note: UK CAA mandatory. Compliance: At next 'D' check or 4800 flight hours after 30 November 1990, whichever occurs later. Background: To prevent the loss of pitot heat whenever a generator fails.