Mir From United States of America, joined Jan 2004, 21864 posts, RR: 55
Reply 1, posted (6 years 3 hours ago) and read 2280 times:
It means that when the aircraft starts its takeoff roll, it should report that to the tower.
If the tower can't see the end of the runway, and they need to know when to start the clock for wake turbulence separation (two minutes behind a heavy or 757), the only way they'll know is when a pilot reports.
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Iahflyr From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 3, posted (6 years 1 hour ago) and read 2254 times:
Quoting Mir (Reply 1): If the tower can't see the end of the runway, and they need to know when to start the clock for wake turbulence separation (two minutes behind a heavy or 757), the only way they'll know is when a pilot reports.
True statement for wake turb however, the distance rather than time is easier to see on RADAR than to remember what the time was when the aircraft stated to roll.
Another reason would be if the ground RADAR system was turned off due to the heavy amount of precipitation (snow or rain), and the local controller needed the rolling report in order to put the next aircraft in position. Some ground RADAR such as early AMASS installs will give nuisance alerts in this type of weather so it is basically useless.
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