Between 06 : 17 : 00 and 06 : 17 : 54, the aircraft climbed from, A photo of a secondary radar screen, without a timestamp, showed the aircraft at flight level 363 approximately and climbing with a ground speed of, which is too slow to maintain stable level flight in still air.
32.
When primary radar was the only type of radar available, the correlation of individual radar returns with specific aircraft typically was achieved by the controller observing a directed turn by the aircraft . Primary radar is still used by ATC today as a backup / complementary system to secondary radar, although its coverage and information is more limited.
