Wake Turbulence Flashcards
What spacing should you give from helicopters with regards to wake turbulence?
3 rotor diameter
When does wake turbulence begin?
When an aerofoil produces lift
For wake turbulence, when does an aerofoil begin producing lift?
Rotation
When does wake turbulence cease?
When the nosewheel touches the ground after landing
Does wake turbulence end when an aircraft lands?
Yes, but only when the nosewheel touches the ground
In what direction does wake turbulence dissipate?
Horizontally
Why may wake turbulence be encountered when passing an aircraft in flight?
Because wake turbulence dissipates
What is the approximate descent rate of wake turbulence?
500 to 1000 ft/min
Wake turbulence may extend for how far behind an aircraft?
5nm
What 3 factors make wake turbulence more severe?
Higher AoA
Lower speed
Cleaner configuration
AoA relation to wake turbulence?
The higher the AoA, the greater the wake turbulence
Speed relation to wake turbulence?
The lower the speed, the greater the wake turbulence
Aircraft configuration relation to wake turbulence?
The cleaner the configuration, the greater the wake turbulence
How do flaps affect wake turbulence?
Extending flaps reduces wake turbulence production
How do the three ‘factors’ of wake turbulence production combine to produce severe wake turbulence?
In order to fly at slower speeds without extending the flaps, the AoA must be increased
How do flaps reduce wake turbulence production?
They disrupt spanwise flow which produces vortex
What is spanwise flow?
High pressure air underneath the wing escaping to upper surface of the wing
Does AGCS provide wake turbulence information/separation?
No
Does AFIS provide wake turbulence minimum/separation?
AFIS can provide warning but can’t provide separation
What distance separates aircraft both vertically and horizontally?
1000ft
Wake turbulence minima should be applied between parallel runways less than what distance apart?
760m
Wake turb minima for a light aircraft following a small aircraft during approach?
4nm
Wake turb minima for an aircraft taking off from same point of runway as preceding aircraft?
2 minutes
Wake turb minima for an aircraft taking off from an intermediate point of runway as preceding aircraft?
3 minutes
