What was found
PILOT REPORTED THAT THE LANDING GEAR DID NOT EXTEND ON SELECTION. AN ALTERNATE GEAR EXTENSION SELECTION WAS CARRIED OUT AND THE AIRCRAFT LANDED WITH OUT INCIDENT. THE PSEU HISTORY AND PRESENT FAULT WERE AS FOLLOWS: "DIN 01A FAULT"(DISCRETE INPUT EXTEND COMMAND) THE PROBLEM WAS TRACED TO A LOOSE GROUND "GS9" CONNECTED TO THE LANDING GEAR CONTROL AND INDICATION PANEL CONNECTOR P55 PIN "P". REF: WDM 32-61-00 SHT 7 OF 12 PAGE 1.