As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 1 GPS FAILED. INSPECTION REVEALED THE INTERNAL CONDUCTOR OF THE COAX ANTENNA CABLE FAILED AT ANTENNA CONNECTION. THIS IS A RECURRING CONDITION THAT HAPPENS EVERY 75-150 FH. ANTENNAS (GPS 1 & 2) ARE LOCATED ON THE TOP OF THE VERTICAL STABILIZER. THIS ARE IS PRONE TO HIGH VIBRATION LEVELS. WE HAVE REQUESTED MULTIPLE TIMES FOR THE AIRCRAFT MFG. TO ALLOW MOVING THEM FROM THERE TO AN AREA LESS PRONE TO VIBRATION. THEY HAVE REFUSED CLAIMING THERE IS NO OTHER LOCATION WHERE THEY CAN GO.