THE PILOT'S INFLIGHT DECISION TO DEVIATE FROM THE AIRPLANE'S ENGINE MANUAL AND THE PILOT'S OPERATING HANDBOOK BY MAINTAINING THE FUEL MIXTURE AT FULL RICH THROUGHOUT THE MISSION AND RAPIDLY DESCENDING THE AIRPLANE WHICH RESULTED IN BOTH ENGINE'S LOSING TOTAL POWER. FACTORS IN THIS ACCIDENT WERE 1) THE PILOT NOT FOLLOWING THE EMERGENCY PROCEDURE FOR BOTH ENGINES FAILING AS OUTLINED IN THE PILOT'S OPERATING HANDBOOK, AND 2) THE PILOT NOT PERFORMING A FLARE DURING THE LANDING SEQUENCE WHICH RESULTED IN THE AIRPLANE COLLIDING WITH THE TERRAIN.