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N
G
CAUTION CAUTION
30° 30°
3 NM
CAUTION
.5 NM
IN FLIGHT
PRELIMIMINARY
787 Flight Crew Operations Manual
Warning Systems -
System Description
15.20.26 Boeing Proprietary
PWS Alerts
Voice
Annunciation
Visual
Indications Description
WINDSHEAR
AHEAD
Red WINDSHEAR
on both PFDs
Master WARNING
lights
Red WINDSHEAR
message on both
NDs
RED, BLACK and
YELLOW
windshear symbol
on ND
WINDSHEAR on
both HUDs
Windshear predicted close to and directly
ahead of airplane.
Enabled during takeoff, below 1,200 feet
radio altitude.
Windshear position displayed by PWS
symbol on the ND and PFD Mini-map.
GO AROUND,
WINDSHEAR
AHEAD
Red WINDSHEAR
on both PFDs
Master WARNING
lights
Red WINDSHEAR
message on both
NDs
RED, BLACK and
YELLOW
windshear symbol
on ND
WINDSHEAR on
both HUDs
Windshear predicted within 1.5 miles and
directly ahead of the airplane.
Enabled during approach, below 1,200 feet
radio altitude.
WIndshear position displayed by PWS
symbol on the ND and PFD Mini-map.
787 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary 15.20.27
Note: Weather radar provides windshear alerts for windshear events containing
some level of moisture or particulate matter.
Note: Weather radar detects microbursts and other windshears with similar
characteristics. Weather radar does not provide alerting for all types of
windshear. The flight crew must continue to rely on traditional windshear
avoidance methods.
Immediate Windshear Alerts
Alert Inhibits
Alerts are inhibited when they are operationally unnecessary or inappropriate.
Alerts are inhibited during normal system operation, and during part of the takeoff
and landing to prevent distracting the crew.
GPWS immediate windshear alert inhibits all PWS, TCAS, and other GPWS
alerts.
When TA/RA is selected on the transponder panel and a GPWS or PWS warning
alert occurs, TCAS automatically inhibits RA mode. During the inhibit, all aircraft
that would have been predicted as an RA are predicted as a TA. When GPWS and
PWS warning alerts are no longer occurring, the RA mode inhibit ends.
Voice
Annunciation
Visual
Indications Description
MONITOR
RADAR
DISPLAY
Amber
WINDSHEAR
message on both
NDs
RED, BLACK and
YELLOW
windshear symbol
on ND
Windshear predicted within 3 miles and
ahead of the airplane.
Enabled during takeoff and approach, below
1,200 feet radio altitude.
Windshear position displayed by PWS
symbol on ND and PFD Mini-map.
Voice
Annunciation
Visual
Indications Description
(Siren)
WINDSHEAR,
WINDSHEAR,
WINDSHEAR
Red WINDSHEAR
on both PFDs
Master WARNING
lights
WINDSHEAR on
both HUDs
Excessive windshear detected by GPWS.
Enabled below 1,500 feet radio altitude.
GPWS windshear detection begins at
rotation.
787 Flight Crew Operations Manual
Warning Systems -
System Description
15.20.28 Boeing Proprietary
Alert Messages Inhibited During Normal System Operation
Certain EICAS alert messages are time delayed, even though related flight deck
panel annunciator lights are illuminated. Time delay inhibits prevent normal
in–transit indications from being displayed as EICAS alert messages. For
example, valves are generally only sensed open or closed, not in–transit. When a
valve is in–transit, the message indicating the valve has failed to open or close is
inhibited to allow the valve time to move to the commanded position. If the valve
is not in the commanded position at the end of the inhibit time delay, the respective
EICAS alert message is displayed.
Alert Messages Inhibited By Other Alert Messages
Some EICAS alert messages are inhibited if another related alert message is
displayed. For example, individual hydraulic pump pressure messages are
inhibited if a hydraulic system pressure message is displayed.
Voice Annunciation Inhibits
Voice annunciations for warning alerts inhibit new voice annunciations for caution
alerts.
All voice annunciations are prioritized to aid flight crew decision making when
more than one alert could occur.
ND Display Alert Inhibits and Automatic Display
Alert displays on the NDs are prioritized to aid flight crew decision making when
　
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