What was found
AFTER ROTATION, THE PRIMARY PITCH TRIM WAS NOT WORKING. TRIM CLACKER WAS CLACKING BUT, THERE WAS NO MOVEMENT OF THE STABILIZER. SWITCHED TO SECONDARY HORIZONTAL PITCH TRIM WHICH WAS OPERATIONAL. MADE AN UNEVENTFUL LANDING. TROUBLESHOOTING REVEALED THE MOTOR IN THE STABILIZER ACTUATOR WOULD RUN WHEN THE PRIMARY TRIM SWITCH WAS SELECTED HOWEVER THE JACKSCREW WOULD NOT MOVE. THE ACFT WAS RETURNED TO SERVICE AFTER REPLACING THE STABILIZER ACTUATOR WITH PN EM 4011-2.