Crosswind or wake turbulence ?
Thread Starter
Join Date: Sep 2014
Location: London
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
Crosswind or wake turbulence ?
What is main problem in this tricky landing of Russian cargo plane IL-76. Crosswind or wake turbulence from Typhoon? Crosswind landing of cargo plane Ilyushin IL-76 at Farnborough FIA14 - YouTube
Join Date: Jul 2004
Location: On the wireless...
Posts: 1,901
Likes: 0
Received 0 Likes
on
0 Posts
Typhoon MTOM is approx 23500Kgs therefore in the 'Small' Wake Turbulence Category.
IL76 MTOM is 195000Kgs therefore in the 'Heavy' Wake Turbulence Category (hardly surprising…)
From CAP493: In the case of an IL76 behind a Typhoon separation for wake turbulence reasons alone is not necessary.
I don't think the IL76 would have even felt a tickle…a crosswind, on the other hand, is a different matter, regardless of mass...
IL76 MTOM is 195000Kgs therefore in the 'Heavy' Wake Turbulence Category (hardly surprising…)
From CAP493: In the case of an IL76 behind a Typhoon separation for wake turbulence reasons alone is not necessary.
I don't think the IL76 would have even felt a tickle…a crosswind, on the other hand, is a different matter, regardless of mass...
Join Date: Oct 2007
Location: Wherever I go, there I am
Age: 43
Posts: 804
Likes: 0
Received 0 Likes
on
0 Posts
You'll also notice that the Typhoon seems to have been taking off. The Ilyushin was landing. As wake turbulence does not start until the aircraft rotates off the ground, there is no way the Ilyushin would have been affected by the Typhoon's wake even if you were not dealing with a small/heavy category difference - it would have landed well before the point that the Typhoon rotated...never mind the effects of wind on the wake. Looks either like a low level wind shift (considering the gusts in the trees) or a pilot over-controlling on landing (which never happens).
Join Date: Oct 2011
Location: United Kingdom
Posts: 310
Likes: 0
Received 0 Likes
on
0 Posts
As wake turbulence does not start until the aircraft rotates off the ground, there is no way the Ilyushin would have been affected by the Typhoon's wake even if you were not dealing with a small/heavy category difference -
Granted it will be lower until AoA is increased (rotation), but not negligible.
That's why they need to rotate.