COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Radio Communication and Navigation Equipment AD/RAD/44 Collins DME-42 Distance Measuring Equipment 3/87 Applicability: Collins Model DME-42 part number 622-6263-002 Distance Measuring Equipment. Requirement: Modify in accordance with Rockwell Collins Service Bulletin DME 42 No. 6, dated 15 October 1986. Note: FAA AD 86-22-10 refers. Compliance: If fitted to an aircraft - within 25 hours time in service after 12 March 1987 or prior to 12 May 1987, whichever occurs first. Otherwise - before fitment to an aircraft. Background: The software incorporated in -002 units can cause erroneous display of DME information because of tuning errors.