Boeing 787-8 - GPWS Look-Ahead Obstacle and Terrain Alerts

787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
15.20.26 D615Z003-TBC
When the airplane is lower than 2,000 feet MSL above the terrain, all obstacles
and terrain within 2,000 feet MSL of airplane barometric altitude are displayed on
the navigation display.
When a obstacle or terrain alert occurs, the respective message is displayed on the
ND. When an OBSTACLE alert occurs while a TERRAIN alert message is
displayed, the OBSTACLE alert message replaces the TERRAIN alert message.
Both messages are not displayed at the same time.
The terrain display is correlated to GPS position, or to IRS position if GPS
position is intermittently unavailable.
Terrain and weather radar cannot be simultaneously displayed on the NDs and
mini-maps. When one pilot selects terrain and the other pilot selects weather radar,
each display updates on alternating sweeps All other navigation displays can be
simultaneously displayed with terrain data.
GPWS Look-Ahead Obstacle and Terrain Alerts
Voi ce
Annunciation
Visual
Indications Description
CAUTION
OBSTACLE
Master CAUTION
lights
Amber CAUTION
OBSTACLE
EICAS message
Amber
OBSTACLE on the
NDs and mini-maps
40 to 60 seconds from projected impact with
obstacle.
Push the TERR OVRD (line select) “key” to
OVRD on the GPWS page of the TCP to
inhibit the alert.
CAUTION
TERRAIN
Master CAUTION
lights
Amber CAUTION
TERRAIN
EICAS message
Amber TERRAIN
on the NDs and
mini-maps
40 to 60 seconds from projected impact with
terrain.
Push the TERR OVRD (line select) “key” to
OVRD on the GPWS page of the TCP to
inhibit the alert.
OBSTACLE,
OBSTACLE
PULL UP
Master WARNING
lights
Red OBSTACLE
on the NDs and
mini-maps
20 to 30 seconds from projected impact with
obstacle.
Push the TERR OVRD (line select) “key” to
OVRD on the GPWS page of the TCP to
inhibit the alert.
February 15, 2010