The weather radar automatically begins scanning for windshear when:
.
thrust levers set for takeoff, or
.
in flight below 2,300 feet RA (predictive windshear alerts are issued
below 1,200 feet RA).
YA613, YA626, YA721, YA722, YC411 - YD655 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.
Copyright . The Boeing Company. See title page for details.
Warning Systems -System Description 737 Flight Crew Operations Manual
YA686, YA687, YA801 - YC154, YK101 - YK104 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. When PWS is enabled, radar antenna scan sweep is reduced.
If windshear is not detected, weather radar returns show only after pushing the EFIS control panel WXR switch.
Predictive Windshear Alert Area
3 NM 3 NM
.5 NM .5 NM
On Ground In Flight
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.
Bank Angle Alert
The GPWS provides the aural alert BANK ANGLE, BANK ANGLE when roll angle exceeds 35 degrees, 40 degrees, and 45 degrees. Once sounded, the alert is silent for that bank angle (35, 40, or 45 degrees) until the system is reset by decreasing bank angle to 30 degrees or less.
Copyright . The Boeing Company. See title page for details.
15.20.16 March 28, 2005
Warning Systems -System Description 737 Flight Crew Operations Manual
Approach Callouts
Radio Altitude Callouts YA613, YA626, YA801 - YA809, YC411 - YK104
The GPWS provides the following altitude callouts during approach:
.
1,000 feet – ONE THOUSAND
.
500 feet – FIVE HUNDRED
.
400 feet – FOUR HUNDRED
.
300 feet – THREE HUNDRED
.
200 feet – TWO HUNDRED
.
100 feet – ONE HUNDRED
.
50 feet – FIFTY
.
40 feet – FORTY
.
30 feet – THIRTY
.
20 feet – TWENTY
.
10 feet – TEN.
Radio Altitude Callouts YA686, YA687
The GPWS provides the following altitude callouts during approach:
.
500 feet – FIVE HUNDRED
.
100 feet – ONE HUNDRED
.
50 feet – FIFTY
.
40 feet – FORTY
.
30 feet – THIRTY
.
20 feet – TWENTY
.
10 feet – TEN.
Radio Altitude Callouts YC153, YC154
The GPWS provides the following altitude callouts during approach:
.
100 feet – ONE HUNDRED
.
50 feet – FIFTY
.
30 feet – THIRTY
.
20 feet – TWENTY
.
10 feet – TEN.
Copyright . The Boeing Company. See title page for details.
Warning Systems -System Description 737 Flight Crew Operations Manual
Radio Altitude Callouts YA721, YA722
The GPWS provides the following altitude callouts during approach:
.
100 feet – ONE HUNDRED
.
50 feet – FIFTY
.
40 feet – FORTY
.
30 feet – THIRTY
.
20 feet – TWENTY
.
10 feet – TEN.
DH/MDA Callouts YA613 - YA809, YC411 - YK104
The GPWS provides height callouts based on the altitude set by the Captain’s Minimums selector.
Callouts are based on radio altitude when the MINS selector is set to RADIO. Callouts are based on barometric altitude when the MINS selector is set to BARO:
. at DH/MDA – MINIMUMS
Traffic Alert and Collision Avoidance System (TCAS)
TCAS alerts the crew to possible conflicting traffic. TCAS interrogates operating transponders in other airplanes, tracks the other airplanes by analyzing the transponder replies, and predicts the flight paths and positions. TCAS provides advisory and traffic displays of the other airplanes to the flight crew. Neither advisory, guidance, nor traffic display is provided for other airplanes which do not have operating transponders. TCAS operation is independent of ground–based air traffic control.
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