The pilot's failure to maintain control of the helicopter as a result of his continued flight into known adverse weather conditions. Factors were the dark night light condition, fog, low ceiling, and the pilot's lack of total instrument flight time.

FLIGHT INTO TREES WHILE RECOVERING FROM AN INADVERTENT SPIN AFTER A PILOT USED INCORRECT PROCEDURES DURING A SIMULATED ENGINE FAILURE BELOW VMC AND THE INSTRUCTOR PILOT DELAYED THE CORRECTIVE ACTIONS.