Abstract: In order to improve safety of instrument flight training for student pilots, training procedure and a risk assessment method based on instrument flight rules and aviation operation control theory were proposed, and a model algorithm based on airspace collision risk and route safety obstacle clearance was built. Then, a complete assessment process of instrument flight release was established, risk evaluation process and index system for procedure implementation were determined, and instrument flight training was carried out according to route transportation flight mode. Finally, the algorithm was verified with classic training test of Red Deer Base in Canada as an example. The results show that this model algorithm based on collision risk and obstacle clearance can systematically analyze relative elements and realize quantitative risk assessment of training content in all sessions

Key words: instrument transition, flight training, safety obstacle clearance, operational control, risk assessment