Wind Shear Flashcards
During departure under conditions of suspected low-level wind shear, a sudden decrease in headwind
will cause
a loss in airspeed equal to the decrease in wind velocity.
During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the
power and vertical velocity required to remain on the proper glidepath.
What is an important characteristic of wind shear?
It can be present at any level and can exist in both a horizontal and vertical direction.
Low-level wind shear may occur when
there is a low-level temperature inversion with strong winds above the inversion.
Hazardous wind shear is commonly encountered
in areas of temperature inversion and near thunderstorms.
If a temperature inversion is encountered
immediately after takeoff or during an approach to a landing, a potential hazard exists due to
wind shear.
GIVEN:
Winds at 3,000 feet - AGL 30 kts
Surface winds - Calm
While on approach for landing, under clear skies with convective turbulence a few hours after sunrise, one should
increase approach airspeed slightly above normal to avoid stalling.
The Low Level Wind Shear Alert System
(LLWAS) provides wind data and software process to detect the presence of a
change in wind direction and/or speed within a very short distance above the airport.