What was found
IND - FLT 1120 - AFTER ROTATION WHILE CLIMBING OUT OF IND EN ROUTE TO PHL, CREW HAD TOTAL RADIO FAILURE. CREW WAS ABLE TO GET THE NR 3 RADIO TO PICK UP DELTA FLIGHT IN THE AREA AND ALTITUDE AND ROUTING INSTRUCTIONS WERE PASSED ALONG. FLIGHT DIVERTED TO PIT WHERE LANDING WAS WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED NR 1 NAV COMM CONTROL PANEL DUE TO DEAD SPOT IN COMM CONTROL ON/OFF VOLUME KNOB. REPLACED NR 1 AND NR 2 COMM TRANSCEIVERS. COCKPIT MICROPHONES ALSO REPLACED. (M)