|Quoting Soxfan (Thread starter):|
I've heard ground control telling aircraft taxiing behind large planes "caution wake turbulence." Can wake turbulence really push a plane around on the ground? Or, is it like a code for the second aircraft to maintain a certain distance behind the larger plane?
|Quoting Mir (Reply 1):|
No, wake turbulence is not a factor on the ground - it's only created when an airplane is in the air. ATC only mentions it if the aircraft will be taking off behind the larger aircraft, meaning that the pilots will have to worry about it at that point.
|Quoting jetboy757 (Reply 4):|
The definition of Wake Turbulence in the pilot/controller glossary...
WAKE TURBULENCE- Phenomena resulting from
the passage of an aircraft through the atmosphere.
The term includes vortices, thrust stream turbulence,
jet blast, jet wash, propeller wash, and rotor wash
both on the ground and in the air.
|Quoting ThirtyEcho (Reply 3):|
When a controller says "caution wake turbulence" it's a legal cover so in the event that something happens the FAA can say that they were warned. It is not a code with a set amount of distance, it's just a heads up to the pilot.
|Quoting bravo1six (Reply 8):|
Wake turbulence commences at rotation of the aircraft generating the wake and only ends when the nose wheel is on the ground, so it's more correct to say that wake turbulence is created by, and is a function of, lift and not merely a creation of an aircrafy being in the air.
So should the controller say "caution wake turbulence" to every aircraft then, just to be safe, regardless of who or what is in front of them or around them? I'm trying to think of when it would be a good idea _not_ to say it to a pilot, especially if it doesn't require the pilot to do anything drastically different.
|Quoting oly720man (Reply 5):|
It was a contributory factor in, though not the ultimate cause of, the crash of AA587 that hit the wake of a B747 that had taken off just before it.
|Quoting ATCstudent (Reply 15):|
I could be wrong, but the wake that the B747 left for AA587 (wingtip vorticies I think, I have a test on this on tuesday), travels down and in, and don't wingtip vortecies have no effect on the ground?
|Quoting tdscanuck (Reply 16):|
The initial path is down and inward (each vortex goes down due to the induced flow from the other one, and they move together because the downflow between them is lower pressure than the upflow outside).
|Quoting HaveBlue (Reply 18):|
I've always been taught its downward and outward, which explained how inflight refueling can be acheived behind and below such heavy aircraft as KC-135's and KC-10's.