Windshear

Question 1

What conditions may indicate windshear?

Answer 1

• Thunderstorm activity
• Virga
• Pilot reports
• Low level windshear alerting system

Question 2

Where is the WINDSHEAR settings on the OPT?

Answer 2

Available as a thrust rating selection in Takeoff Performance.

Question 3

What is the effect of selecting WINDSHEAR on the OPT?

Answer 3

• Highest engine thrust rating
• Windshear VR is calculated (up to 20kts higher)
• Assumed Temperature Reduction is not allowed
• V speeds are normal, however Windshear VR is in amber and rotation can be delayed until reaching it.

Question 4

Recommended actions if taking off in suspected windshear:

Answer 4

• Full rated takeoff thrust
• Use F5, F10, F15
• Use the longest suitable runway, provided it is clear of known windshear areas
• Consider increasing VR to Vr+20kts.

Question 5

Recommended actions for approach and landing

Answer 5

• Use F30
• Be stabilised early by 1000ft
• Use glide path indications to detect deviations from the flight path early
• Add an appropriate airspeed correction, up to 15kts
• Avoid large thrust reductions / trim changes for airspeed increases as they may be followed by airspeed decreases.

Question 6

When must we perform the Windshear Escape Manoeuvre?

Answer 6

Aural alert - “WINDSHEAR, WINDSHEAR, WINDSHEAR”

Visual alert - WINDSHEAR on both attitude indicators.

Unacceptable flight path deviations:

• 15kts airspeed
• 500fpm vertical speed
• 5º pitch attitude
• 1 dot G/S
• Unusual thrust lever position for a significant period of time

Question 7

What is the response to an amber WINDSHEAR on the ND and a “MONITOR RADAR DISPLAY” call ?

Answer 7

Manoeuvre as needed.

Question 8

Difference between Windshear Warning vs Predictive Windshear Warning

Answer 8

Windshear Warning = produced by GPWS - in actual windshear. Carry out the escape manoeuvre.

Predictive - Wx Radar - no two tone siren.

Question 9

What is the effect of a predictive windshear warning on takeoff?

Answer 9

Reject the takeoff

Question 10

What is the effect of a predictive windshear warning on approach/landing?

Answer 10

Carry out the escape manoeuvre, or perform a go-around with pilot’s discretion.

Question 11

What is the windshear escape manoeuvre?

Answer 11