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/52 Rockwell International, Collins Air Transport Division DME-700 Applicability: Rockwell International, Collins Air Transport Division, DME- 700 Distance Measuring Equipment, all serial numbers, with the following part numbers: 4/94 622-4540-020, 622-4540-021, 622-4540-022, 622-4540-120, and 622-4540-121. Note: These equipments are known to be installed on, but not limited to the following aircraft series: Airbus Industrie A300, A310, A300-600, A320 and A340 Boeing 737, 747-400, and 767 Fokker F-100 McDonnell Douglas MD-11 and MD-80 Requirement: Unless previously accomplished, incorporate Collins Air Transport Division Service Bulletins in accordance with the following Table: Collins SB Dated Applicable DME-700 Part Numbers SB 20 Revision 1 30 August 1991 622-4540-020 and -120, with serial numbers 1 through 4247 inclusive. SB 25 11 November 1992 622-4540-020,, -021 and -022. SB 20 Revision 1 must be installed on applicable part numbers, prior to, or in conjunction with SB 25. SB 24 is incorporated by SB 25. SB 26 21 October 1992 622-4540-120 and -121. SB 20 Revision 1 must be incorporated in applicable part numbers, prior to, or in conjunction with SB 25. SB 26 eliminates the requirement for SB 21. Note: FAA AD 94-02-02 Amdt 39-8799 refers. Compliance: Prior to 31 March 1995. Background: Several operators have reported random instances of erroneous DME indications, the affected units failing to process and update distance outputs. Additionally, some units have been reported as establishing a continuous restart mode upon application of power. These conditions are known colloquially as `sleeping' or `deaf' modes of operation. Compliance with this Directive will effectively prevent units from displaying these characteristics. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES