The flashcards below were created by user
Anonymous
on FreezingBlue Flashcards.
-
Wake turbulence zone
The region behind the aircraft containing the trailing edge vortices
-
The vortices produced by an aircraft are directly proportional to what?
the amount of lift being produced
-
Greatest vortex strength will occur when?
Generating aircraft is heavy, clean and slow
-
How big is the vortex core diameter?
Diameters equal about 1/4 of the generating aircrafts wingspan
-
As the vortices trail behind the aircraft, how close do they stay together?
- about 3/4 the wingspan.
- They tend to interact creating a even larger field of influence
-
Small airplanes should avoid operating within ____ rotor diameters of any hovering helicopter.
three
-
What is the minimum spacing required behind a heavy aircraft (>250,000lbs)?
- 2 minutes
- Also encouraged behind large aircraft (41,000-250,000lbs)
-
At what points on landing and takeoff are wingtip vortices generated or stopped?
- Takeoff- aircraft rotates
- Landing- nose gear touches down
-
Wind shear
A sudden change in wind direction and/or speed over a short distance in the atmosphere
-
Increasing performance wind shear
lift and climb performances will increase
-
Decreasing performance wind shear
lift and climb performance will decrease
-
What happens to an aircraft on landing when encountering a decreasing performance wind shear?
aircraft pitches down and descends below the glidepath
-
Characteristics of a microburst
Generally small, associated with heavy rain showers and usually short-lived, less than 20 min
-
Initial effects of a microburst on an aircraft.
- Strong increase in headwind
- Increase in IAS
- Aircraft pitches up and climb
-
Late effects of a microburst on an aircraft?
- Severe downdraft
- Headwind shifts to a strong tailwind
- Loss of IAS
- Aircraft pitches down and descends
-
Clues that wind shear exist include:
gusty winds; heavy rain; thunderstorms
-
Visual clues of microburst activity include:
virga; localized blowing dust; rain shafts with rain diverging away from core of the cell; lightning; tornado-like activity
|
|