elcapo

Dear people,

I was looking for an official document stating the wake turbulence separation applied to a medium a/c behind a Boeing 757 on T/O and LDG. (official doc if possible)
I would like to know as well the official rule for the start of timing regarding wake turbulence separation on T/O, as some start timing at brake release and others at rotation of preceeding.

Many thanks for your inputs.
Regards

Elcapo

Defruiter

For the approach:

http://www.caa.co.uk/docs/33/CAP493PART1.PDF

Page 84, table at the bottom

Gonzo

Elcapo,

Be aware, the above is a UK publication. We treat the 757 as an 'upper medium', and not as a 'heavy' as many European states do.

eyeinthesky

Wrt the timing question:

Wake vortex on departure doesn't start until the aircraft rotates and the wings start to produce lift. Therefore the 2 minutes or whatever should start at that point. Many tower controllers will tell you that they are experienced in judging the issuing of take-off clearance so that the next aircraft will rotate as close as possible to 2 or 3 minutes (but not less) after the preceding one rotated.

Then there is the "Heathrow two minutes"...

elcapo

Thanks for your replies so far. For the LDG it is pretty clear, as for the T/O not at all. I am F/O in a european company, during my ATPL I have been told to consider it as a heavy, but it changed since. Officially it is a medium type, so for LDG I found official docs, as for T/O not yet. Personally I am timing once the preceeding is starting to roll,as it will take me +- the same time to reach the rotation point. But it would be nice to find something written regarding that.

huckleberry58

I think it's not that difficult, just hit your your timer when you see the preceding aircraft start moving and commence your take off 2 minutes later. I'm sure that's what the tower guys do, no? Granted the time from brakes off to rotation may vary but I'd say it would be negligable - maybe in the order of 10secs max?

elcapo

Yes huckleberry, but I need an official statement, logically it is like that, but I am sure that it should be written somewhere. Thanks anyway.

elcapo

Still waiting for some replies.

Thanks

Swanie

in aussie
B757 is a heavy if it's the leading aircraft, and a medium if following an official heavy,
i think here it's 6nm/3min separation on radar and for arrival...
in AIP ENR section i can find the exact page if your question is inregard to aussie rules and regs

161R

For a more in depth explanation of the UK situation,try http://www.chirp.co.uk/new/Downloads/pdfs/AIC17_99.pdf

barnatco

This also applies in Spain on Approach Control. Likewise, the vortex separation we provide between two B757' s is five miles on the localiser.