Medium behind a heavy on take off wake seperation?

This forum has been developed to discuss ATS related topics.

Moderators: ahramin, sky's the limit, sepia, Sulako, North Shore

Post Reply
Message
Author
User avatar
I WAS Birddog
Rank Moderator
Rank Moderator
Posts: 336
Joined: Sat Dec 25, 2010 6:38 am
Location: dude...I just walk the earth.
Contact:

Medium behind a heavy on take off wake seperation?

#1 Post by I WAS Birddog » Wed Aug 17, 2016 5:33 pm

I noticed that the cleared for take off nod is given at about the 1:30 minute behind a heavy from the same initial take off point.

I am under the understanding that a full 2 minutes must be allotted before we are cleared to blast off. Is it under the understanding that by the time we spool up and start rolling forward that it's close to the 2 minute mark for traffic flow efficiency?

Not being 'that guy' that gets all prudish about 30 seconds. Lord knows my wife is constantly reminding me that 30 seconds isn't anywhere near........satisfactory. :wink:
---------- ADS -----------
  
“Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself. -Rumi
http://twitter.com/@iwasbirddog

blue thunder
Rank 1
Rank 1
Posts: 47
Joined: Fri Mar 18, 2011 9:07 am

Re: Medium behind a heavy on take off wake seperation?

#2 Post by blue thunder » Wed Aug 17, 2016 5:47 pm

[quote="
Not being 'that guy' that gets all prudish about 30 seconds. Lord knows my wife is constantly reminding me that 30 seconds isn't anywhere near........satisfactory. :wink:[/quote]


:lol: My wife told me that "size matters". Out went the R44 and in came the 407............I think that's what she meant!
---------- ADS -----------
  

Driving Comet
Rank 3
Rank 3
Posts: 136
Joined: Fri Jun 05, 2009 7:27 pm

Re: Medium behind a heavy on take off wake seperation?

#3 Post by Driving Comet » Wed Aug 17, 2016 6:20 pm

Time based wake seperation is measured nose wheel up (rotation) to nose wheel up, not take off clearance to take off clearance. I will start aircraft before the time expires because I know the time will expire by the time the aircraft rotates.

Another reason may be that at larger airports, the tower controllers are certified to provide radar seperation between departures, therefore in your case the preceding heavy will be at least 5 miles away by the time you rotate. Might be around the 1:30 mark.
---------- ADS -----------
  

Braun
Rank 7
Rank 7
Posts: 679
Joined: Thu Mar 23, 2006 11:32 pm

Re: Medium behind a heavy on take off wake seperation?

#4 Post by Braun » Wed Aug 17, 2016 6:21 pm

If the tower is certified to use radar separation they can use mileage instead of time for wake turbulence separation on successive departures.

EDIT: Except behind an A380, then it is always time based separation
---------- ADS -----------
  

Post Reply

Return to “ATS Question Forum”