What was found
(CAN) IT WAS REPORTED ON NOVEMBER 25, 2009 THAT DURING A TRAINING FLIGHT THE RT ENGINE EXPERIENCED A SEVERE POWER LOSS. JUST PRIOR TO THIS INCIDENT ENGINE WAS NOTICED SURGING BETWEEN 50 AND 70 PERCENT POWER. JUST AFTER THE INITIAL POWER LOSS THE ENGINE INADVERTENTLY RESTARTED BEFORE EXPERIENCING A SECOND SIGNIFICANT POWER LOSS. WITH THE EXCEPTION OF "ALTERNATOR FAILURE", NO OTHER WARNINGS WERE NOTED THROUGHOUT. CREW WAS NOT ABLE TO RESTART ENGINE, DECLARED AN EMERGENCY AND WERE ABLE TO LAND AT DEPARTURE AIRPORT WITHOUT FURTHER INCIDENT. (TC NR 20091127002)