What was found
(CAN) DURING A TRAINING FLIGHT, THE NR2 ENGINE WAS SHUTDOWN. FOLLOWING MOMENTS REVEALED THAT THE NR1 ENGINE GENERATOR WAS FAILED. 1 BATTERY START OF NR2 ENGINE WAS TRIED WITH NO SUCCESS. DUE TO COMPLETE ELECTRICAL POWER FAILURE, THE CREW SUCCEEDED TO CONTACT ATC BY CELL PHONE TO LAND. MX REPLACED THE NR1 ENGINE STARTER (WHICH WAS SENT TO O/H SHOP FOR EVALUATION) AND DEPLETED MAIN BATTERY. FUNCTIONAL TESTS C/OUT AND ACFT RETURNED TO SERVICE. FURTHER TROUBLESHOOTING IS UNDERWAY TO VERIFY ELECTRICAL SYSTEMS FUNCTIONS. (TC 20100204009)