50 02 Turbulence And Wind Sheer Flashcards
1
Q
What is the definition of Wind Sheer?
A
Wind sheer is when wind direction or speed suddenly changes
2
Q
What are the levels of Turbulence and the associated descriptions?
A
Light:
- IAS changes of 5-15kts
- Rhythmic bumpiness
- Still easily serve passengers
Moderate:
- IAS changes of 15-25kts
- Changes to attitude and altitude but always under control
- Difficult to serve passengers
- Must be reported
Severe:
- IAS changes >25kts
- Large changes to attitude and altitude, temporarily out of control
- Impossible to serve passengers
- Must be reported
3
Q
Describe horizontal wind sheer
A
- When flying straight and level, encounter a change of wind speed or direction
- Measured in Kts per 1000ft
4
Q
Describe vertical wind sheer
A
- When descending or climbing, encounter a change of wind speed or direction
- Measured in Kts per 100ft
5
Q
Where are you likely to encounter wind sheer?
A
- Thunderstorms
- Micro/Macro bursts
- Areas of orographic uplift
- Fronts
- Tornados
- Inversions
6
Q
Describe Thermal/Convective Turbulence and what causes it
A
Turbulence caused by heating of lower air levels which leads to rising air
7
Q
Describe Mechanical/Frictional Turbulence
A
Turbulence caused by orographic reasons e.g. Mountain Waves
8
Q
Describe Boundary/Friction Layer Turbulence
A
Caused by obstacles on the ground, e.g. Buildings
