737 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
15.20.20 D6-27370-866-EGP
Alerts are available approximately 12 seconds after the weather radar begins
scanning for windshear. Predictive windshear alerts can be enabled prior to takeoff
by pushing the EFIS control panel WXR switch.
If windshear is not detected, weather radar returns show only after pushing the
EFIS control panel WXR switch.
Predictive Windshear Inhibits
During takeoff and landing, new predictive windshear caution alerts are inhibited
between 80 knots and 400 feet RA, and new warning alerts between 100 knots and
50 feet RA. These inhibits do not remove existing predictive windshear alerts. If
a warning/caution event occurs before those boundaries, it will remain on the
display and the complete aural callout will be annunciated.
.5 NM
1.5 NM
W
A
R
N
I
N
G
Predictive Windshear Alert Area
30°
On Ground
30°
3 NM
W
A
R
N
I
N
G
Caution
Caution
30°
In Flight
30°
3 NM
Caution
.5 NM
March 26, 2015
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