AE108 Flashcards
The vortices produced by an aircraft are directly proportional to the amount of lift being produced.
Based on that relationship, which aircraft will generate stronger vortices and therefore greater wake turbulence - a f-22, a t-17 or c-5?
The C-5
As you should recall from basic aerodynamics, higher AOA means greater induced drag. Based on
that knowledge and what you just learned about the relationship between induced drag and vortex
intensity, which flap configuration do you think will cause increased wake turbulence strength?
Flaps up. A clean wing must maintain a higher AOA and there by creates more induced drag which in turn produces greater wing tip vortices
When will the greatest vortex strength occur?
A heavy, clean and slow aircraft
When flying behind a big aircraft in what position would you expect to encounter an induced roll to the left?
Behind the right wingtip, which creates a vortex rotating counterclockwise.
True or false. Pilots of small aircraft should avoid operating within 2 rotor diameters of a hovering helicopter due to downwash hazards. However, since a helicopter does not generate wake turbulence, normal spacing rules do not apply.
False. Pilots should avoid operating within 3 rotor diameters of a hovering helicopter and follow normal wake turbulence spacing rules
When taking of behind a heavy departing aircraft, where should you plan to takeoff yourself? Before or after the heavy aircraft’s lift off point?
Before and try to maintain a flight path above the heavy aircraft- that way you can completely avoid its vortices.
When taking off behind a heavy aircraft (over 255,000 pounds) what are established spacing requirements?
2 minutes.
This spacing is also encouraged behind large aircraft (41,000 to 255,000 pounds).
What is the Minimum landing spacing requirement behind a heavy aircraft (over 255,000
pounds)?
3 minutes
When operating on runways that are intercecting or closer than how many feet, should you be alert to adjacent heavy aircraft operations?
Adjacent runways within 2500 ft.
You should insure an interval of at least 2 minutes before attempting to take off or land
How is Wind shear defined?
As a sudden change in wind speed/direction over a short distance in the atmosphere.
Where is A microburst most likely to be encountered?
In areas of heavy rain
True or false. Wake turbulence is generated only by heavy aircraft?
False, they are created by any aircraft whenever it is producing lift.
When taking off behind a heavy aircraft in the T-6A, you should allow for a minimum spacing of how many minutes?
2 minutes
When taking off behind a heavy aircraft that has just landed, what should you do to minimize the
effects of its wake turbulence?
Plan to lift off after its nose gear touchdown point
Key hazards created by wake turbulence are?
induced roll and induced flow field
True or false? The wake turbulence generated by a heavy aircraft taking off from a parallel or intersecting runway is not a factor for aircraft operating on another runway.
False, and they should be considered (with adjacent runways within 2500 ft)
How will a wind shear that decreases your headwind component by 20 knots affect your airspeed and lift?
Indicated airspeed will decrease 20 knots thereby decreasing lift.
During an approach, you pass through a shear that changes the wind from a 10 knot tailwind to a 10
knot headwind. How will this shear affect your aircraft?
Indicated airspeed will increase by 20 knots, lift will increase, and aircraft will tend to climb above glidepath.
What wind changes would an aircraft initially encounter if flown through a microburst?
A strong headwind
An aircraft reported wind shear on final with a 10 knot loss of airspeed. How should you adjust your
approach?
Set flaps to “Takeoff” and add 10 knots to your approach speed.
Which way does an aircraft’s two wing vortices rotate when seen from behind?
Left vortex: clockwise
Right vortex: counter-clockwise
