What was found
(CAN) DURING ANNUAL INSPECTION FLIGHT TEST PILOT OBSERVED MAIN ROTOR SPEED DROP, WARNING LIGHT ILLUMINATED AND BOTH ENGINE TORQUE INDICATIONS BETWEEN 0 TO 1 PERCENT DURING DESCENT. PILOT DECLARED EMERGENCY LANDING AND ACFT LANDED UNEVENTFULLY IN AN OPEN FIELD. NO INJURIES REPORTED. LATER INFORMATION REVEALED THAT ENGINES WERE PRODUCING POWER HOWEVER THIS WAS NOT BEING TRANSFERRED TO THE HELICOPTER MAIN GEARBOX. HELICOPTER TRANSFERRED FOR FURTHER TROUBLESHOOTING.