What was found
CUSTOMER PURCHASED GPS UNIT FROM AIRCRAFT SPRUCE AND SPECIALTY CO. UPON INSTALLATION IN AIRCRAFT, FOUND UNIT IMPROPERLY WIRED. WIRED IAW ALLIED SIGNAL INSTALLATION MANUAL AND FOUND UNIT TO OPERATE TO SPECIFICATION. MANUAL NR 006-10500-0001. SUBMITTER RECOMMENDED THAT AVIONICS SHOPS WIRING SYSTEMS REFER TO INSTALLATION MANUAL AND TEST WIRING HARNESS BEFORE DELIVERING TO CUSTOMER. ALSO, NO MAINTENANCE RELEASE WAS DELIVERED WITH UNIT.