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In training scheduled air carrier flight crews in the use of airborne storm avoidance radar, a twofold problem is encountered. The utility of the instrument must be sold to the doubting Thomas who has many thousands of hours flying in thunderstorm conditions, and its limitations must be defined for those who see it as a miracle maker. In overcoming these problems, United Air Lines, training program has emphasized basic scope interpretation with special reference to severe storms and their appearance on a planposition indicator (ppi) display. Flight crew reaction to the training and to the radar installations in United's fleet has been favorable and is described.