787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Navigation Systems Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.20.17
Weather Radar
The weather radar system consists of a receiver/transmitter unit and antenna.
Control is managed through the TCP. Radar returns display on the ND in MAP
mode only.
The EFIS control panel weather radar (WXR) map switch controls power to the
transmitter/receiver. Weather radar is displayed on the ND when the WXR
checkbox is checked on the ND drop-down menu. The radar display range
automatically adjusts to the ND range selected on the EFIS control panel. At ND
ranges greater than 320 NM, WXR can still be displayed but only shows weather
returns out to 320 NM.
The weather radar system performs various levels of self test on power up, during
each sweep, and when descending through 2,300 feet AGL.
Turbulence can be sensed by the weather radar only when there is sufficient
precipitation. Clear air turbulence can not be sensed by radar.
The weather radar also provides predictive windshear alerting. (Refer to
Predictive Windshear (PWS) Display and Annunciations
in Chapter 15, Section
10, for additional information.)
August 14, 2009
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