Windshear

Question 1

What does the PF cross-check for to detect windshear during takeoff/approaches?

Answer 1

hesitant or excessive airspeed buildup on takeoff roll
uncommanded airspeed change of +/- 10 KCAS on approach
uncommanded FPV change of +/- 2 degrees
VVI change of 500 FPM during takeoff/approach
excessive radar altitude sink rate
excessive nose high/nose low pitch attitude

Question 2

What does the PM cross-check for to detect windshear and report it to the PF?

Answer 2

hesitant or excessive airspeed buildup on t akeoff roll
uncommanded airspeed changes of +/- 10 KCAS on approach
sudden tailwind/headwind ground speed change of 15 knots or greater
sudden wind speed/direction changes and differences at altitude from reported airfield winds
excessive radar altitude sink rate
uncommanded PFV change of +/-2 degrees
VVI change of 500 FPM during takeoff/approach
weather radar indications for areas of red surrounding precipitation and for heavy precipitation along the takeoff/approach path
PWS alternating red/black arcs/searchlights on MFD PPI FSR or ND Map formats

Question 3

increasing performance windshear

Answer 3

increasing headwind or decreasing tailwind= A/S increase (only will get “WINDSHEAR” at bottom of HUD/PFD)

Question 4

decreasing performance windshear

Answer 4

decreasing headwind or increasing tailwind= A/S decrease (will get flashing “WINDSHEAR” in center of HUD/PFD and CAWS ALERT “WINDSHEAR”)

Question 5

How does the radar display predictive windshear?

Answer 5

red and black searchlights

Question 6

windshear recovery (prior to Go speed)

Answer 6

reject takeoff

Question 7

windshear recovery (after Go speed)

Answer 7

MAX thrust
still on runway-consider delaying rotation (in no case past 1000’ remaining mark)
after lift-off, increase airspeed by attaining a pitch attitude to achieve 1-2 degrees positive FPV (400-500 FPM VVI)
-if 400-500 FPM can’t be attained with 15 degrees pitch, maintain 15
don’t exceed 15 degrees of pitch below 200 feet AGL unless sink rate exists
-if it does, increase pitch to stick shaker/stall warning onset and maintain until clear
don’t follow F/D guidance
raise the gear after an extended period of positive climb rate has been established and ground contact not a concern
-not less than 1000 feet AGL
maintain 1/2 flaps, index unchanged, until windshear exited and Vmfr attained

Question 8

What does 15 degrees of pitch approximate for windshear recovery?

Answer 8

best 1/2 flaps climb performance

Question 9

windshear recovery (on approach)

Answer 9

MAX thrust
TOGA and disengage AP/ATS
disregard F/D pitch guidance
flaps 1/2, index unchanged
attain pitch attitude to achieve a 1-2 degree positive FPV (400-500 FPM)
-if 400-500 FPM can’t be attained with 15 degrees pitch, maintain 15
don’t exceed 15 degrees of pitch below 200 feet AGL unless sink rate exists
-if it does, increase pitch to stick shaker/stall warning onset and maintain until clear
raise the gear after an extended period of positive climb rate has been established and ground contact not a concern
-not less than 1000 feet AGL
maintain 1/2 flaps, index unchanged, until windshear exited and Vmfr attained

Question 10

Purpose of the windshear procedure:

Answer 10

to accelerate the aircraft through the windshear while minimizing attitude loss