Incident at St. Catharines, Ont (Communication navigation surveillance/air traffic system)
1997-10-03: N116AZ, C-GNOP, S-161, Wings Leasing Inc. C-GNOP observed S-61 which passed approx 200 ft below, 4 miles west of YSN at 1900 ASL. FSS at St. Catherines was not in radio contact with helicoper therefore was unable to give a traffic advisory to C-GNOP. Hamilton tower later verified they had been in contact with N116AZ, but were unable to request point of departure or type. Hamilton airport manager observed a S-61 pass .5 mile south of YHM.
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