Are there any installation considerations for the various part numbers of the Bendix/King KDM-706A DME?
Yes. There are several installation and wiring considerations that need to be addressed when changing KDM-706A units in existing installations. KDM-706A units with P/N 066-1066-20 and -22 did not originally have Mod 4 installed in original production. Mod 4 addresses the addition of a DME track flag output that is used This output is required to complete a compatible interface to some navigation systems such as the older KNS-660 and Litton 3000 as well as Sperry RD-650 HSIs. In order for a unit with Mod 4 to function properly in place of an existing KDM-706A without Mod 4, you must rewire part of the harness to prevent damage to the unit. Connector P7063 must be removed from ground potential (i.e. -20/22, non Mod 4 units) and rewired. Pin 19 of P7063 was used for aircraft ground on -20/22, non Mod 4 units. For units with Mod 4 and -23/24/25, Pin 19 is now used to provide +28VDC at 150ma drive capability for the purpose of operating a DME track valid flag. This can be achieved by connec
Answer Yes. There are several installation and wiring considerations that need to be addressed when changing KDM-706A units in existing installations. KDM-706A units with P/N 066-1066-20 and -22 did not originally have Mod 4 installed in original production. Mod 4 addresses the addition of a DME track flag output that is used This output is required to complete a compatible interface to some navigation systems such as the older KNS-660 and Litton 3000 as well as Sperry RD-650 HSIs. In order for a unit with Mod 4 to function properly in place of an existing KDM-706A without Mod 4, you must rewire part of the harness to prevent damage to the unit. Connector P7063 must be removed from ground potential (i.e. -20/22, non Mod 4 units) and rewired. Pin 19 of P7063 was used for aircraft ground on -20/22, non Mod 4 units. For units with Mod 4 and -23/24/25, Pin 19 is now used to provide +28VDC at 150ma drive capability for the purpose of operating a DME track valid flag. This can be achieved by
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