C4 Windshear

Question 1

What is windshear?

Answer 1

A sustained change in wind velocity along the aircraft flight path, which occurs significantly faster than the aircraft can accelerate or decelerate

Question 2

What are typical conditions conducive to windshear?

Answer 2

• frontal/squall/thunderstorm activity
• low level inversions
• local terrain or buildings considered in relation to wind speed and direction

Question 3

Which takes precedence, onboard windshear alerts or TCAS annunciations?

Answer 3

Windshear alerts

Question 4

What should a windshear report contain?

How long should this be broadcast?

Answer 4

• windshear warning
• height or height band
• time
• effect (e.g. speed gain/loss, vertical speed, drift)

The report should be broadcast to inbound/outbound aircraft until confirmation is received the condition no longer exists