What was found
POINTS IN RELAY FUSE TOGETHER CAUSING RUNAWAY TRIM ACTION RESULTING IN UNCONTROLLED ATTITUDES OF ACFT. REQUIRES TWO PILOTS ON CYCLIC TO OVERRIDE AND LAND ACFT. RELAY MFG (SIEMENS) HAS INDICATED THIS MAY NOT BE THE CORRECT RELAY FOR THIS APPLICATION. INSTALLED NEW RELAYS PER MM, SDB, AND AD. NOTE: A SINGLE PILOT MAY NOT BE ABLE TO RECOVER AND LAND SAFELY. THIS PROBLEM HAS BEEN OCCURRING SINCE 2-92.