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Advise When You Start Your Roll  
User currently offlineNathanr From United States of America, joined Jan 2008, 22 posts, RR: 0
Posted (5 years 7 months 6 days 23 hours ago) and read 2193 times:

I was listening to PDX tower today, and heard the controller say "advise when you start your roll."

I assume this has to do with the cold, snowy weather PDX is experiencing now, because I have never heard this before.

So I was wondering if anyone could tell me why the controller said that, and what it means.

Thanks

3 replies: All unread, jump to last
 
User currently offlineMir From United States of America, joined Jan 2004, 21515 posts, RR: 55
Reply 1, posted (5 years 7 months 6 days 23 hours ago) and read 2186 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.

-Mir



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User currently offlineNathanR From United States of America, joined Jan 2008, 22 posts, RR: 0
Reply 2, posted (5 years 7 months 6 days 23 hours ago) and read 2186 times:

That makes sense. Visibility was extremely low. Didn't think about that....

Thanks


User currently offlineIahflyr From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 3, posted (5 years 7 months 6 days 21 hours ago) and read 2160 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.



Any views shared are strictly my own and do not a represent those of any former employer.
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