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32 Cards in this Set
- Front
- Back
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What is the name of the phenomenon resulting from the passage of an aircraft through the atmosphere that included vortices, thrust stream turbulence, jet blast, jet wash, and propeller wash? |
Wake Turbulance |
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What is the name of the circular patterns of air created by the movement o the airfoil through the air When generating lift? |
Vortices |
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What is the most prominent part of Wake Turbulence? |
Vortices |
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What three factors effect the strength of a vortex (rotational force)? |
Weight of aircraft Shape of the wing (Effecting wing loading) Speed of the aircraft |
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What are the conditions that create the greatest strength vortex? |
Aircraft that are “Heavy, Clean, and Slow” |
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What is the greatest factor of the 3 that effect the intensity of wake turbulence? |
The weight of the aircraft |
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What type of aircraft do not create wake turbulence? |
None. they all create wake turbulance |
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What is another name for Jet Blast? |
Thrust stream turbulence |
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What is a Clean configuration on an aircraft mean? |
No flaps are extended on the wings so the wings are smooth |
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What does a dirty configuration mean on an aircraft? |
The flaps are up so the wings are less smooth resulting in less wake turbulence |
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How does speed effect wake turbulence? |
Slower = more wake turbulence Faster = less wake turbulence |
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What makes wake turbulence diminish? |
Time and Distance |
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What do pressure differentials trigger? |
Roll up of air flow known as wake vortex or wing tip vortices |
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How do wing tip vortices rotate and move? |
Rotate Inward (Clockwise on left and counter on right) and drift outward |
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When are vortices first generated? |
At the moment the aircraft generates lift (Nose leaves the ground) |
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When does and aircraft cease to create vortices? |
When the aircraft stops producing life (All gears on the ground) |
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What is a vortex sink rate? |
300-500 ft per min. |
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When do vortexes normally level off? |
500-1000 ft below the flight path |
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What can cause vortices to descend at a slower rate or even climb? |
Temp Inversions, and updrafts |
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How will vortices move near the ground with no wind? |
2- 3 knots laterally |
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How does a cross wind effect vortices? |
It will stall one and increase the others movement |
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How will a tailwind effect vortices? |
Can move vortices into the landing zone of the aircraft that are landing longer to avoid the vortices |
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What is the name for the mechanical force a wake vortex has on an aircraft? |
Induced roll |
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What is the name for the ability of an aircraft to move around the longitudinal axis? |
Roll control |
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What are the two things that effect the aircrafts ability to resist the induced roll? |
The wingspan being larger than the vortices and the counter control ability of the aircraft |
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When does a helicopter create downwash? |
In a slow hover or stationary hover |
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How far does the the downwash from a helicopter spread? |
Three times the diameter of the Rotor |
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When will helicopters produce wake turbulence similar to a fixed wing aircraft? |
When they are in forward or backward motion |
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What term can you use instead of Jet blast? |
Thrust stream turbulence |
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Are controllers responsible for anticipating the existence or effects of wake turbulence? |
No because it is unpredictable |
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Why terms can be used in lieu of the term wake turbulence |
Jet Blast, Prop Wash, Rotor wash |
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What is the greatest impact of wake turbulence on ATC? |
Increased separation |
