An important decrease of onboard air crew exposure level was registered at the Forbush decrease observed during the period of disturbed solar conditions at the end of October 2003. The onboard dosimetry and geophysical data are presented and compared. Comparable decrease is observed for onboard measurements and geographically nearby cosmic ray neutron monitor's data. It seems that both quantitative and qualitative changes of cosmic rays fields accompany such type of events. Some previous data on similar results obtained during 2001 year both on solar cosmic ray events and Forbush decreases are also referred to and compared with new ones.