This unit removed in working condition. It is now being sold as is for parts. Certain functions with the nav not functioning as intended. 

KNS 80 Nav System VOR/LOC/DME/RNAV/GS

Mods 1,2,3,4,6,7,8,9,10,11

PN: 066-4008-00

SN: 16996

14/28 VDC