nathanr
Posts: 20
Joined: Sun Jan 06, 2008 8:20 am

Advise When You Start Your Roll

Mon Dec 22, 2008 10:32 am

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
 
Mir
Posts: 19290
Joined: Mon Jan 05, 2004 3:55 am

RE: Advise When You Start Your Roll

Mon Dec 22, 2008 10:40 am

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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nathanr
Posts: 20
Joined: Sun Jan 06, 2008 8:20 am

RE: Advise When You Start Your Roll

Mon Dec 22, 2008 10:41 am

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

Thanks
 
IAHFLYR
Posts: 3948
Joined: Sat Jun 25, 2005 12:56 am

RE: Advise When You Start Your Roll

Mon Dec 22, 2008 12:37 pm



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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