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takeoff or go-around.
GLIDESLOPE Master CAUTION
light
Amber
GLIDESLOPE
EICAS message
Amber BELOW
G/S displayed on
G/S INHIBIT
switch
Excessive deviation below glideslope.
Volume and repetition rate increase as
deviation increases.
Pushing the G/S INHIBIT switch on the ATP
inhibits the alert when pushed below 1,000
feet radio altitude.
PULL UP Red PULL UP
message on both
PFDs
Master WARNING
lights
Follows SINK RATE alert when descent rate
becomes severe, or
follows TERRAIN alert with flaps and/or
gear not in landing configuration when
excessive terrain closing rate continues.
787 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary 15.20.23
Voice
Annunciation
Visual
Indications Description
SINK RATE Master CAUTION
light
Amber SINK
RATE EICAS
message
Excessive descent rate.
TERRAIN Master CAUTION
light
Amber TERRAIN
EICAS message
Excessive terrain closing rate.
TOO LOW,
FLAPS
Master CAUTION
light
Amber TOO LOW
FLAPS EICAS
message
Amber TOO LOW
FLAPS on both
PFDs
Unsafe terrain clearance with flaps not in
landing configuration at low altitude and
airspeed.
Toggling the FLAP OVRD switch to OVRD
on the GPWS page of the TCP inhibits the
alert.
TOO LOW,
GEAR
Master CAUTION
light
Amber TOO LOW
GEAR EICAS
message
Amber TOO LOW
GEAR on both
PFDs
Unsafe terrain clearance with gear not in
landing configuration at low altitude and
airspeed with gear not down.
Toggling the GEAR OVRD switch to OVRD
on the GPWS page of the TCP inhibits the
alert.
787 Flight Crew Operations Manual
Warning Systems -
System Description
15.20.24 Boeing Proprietary
Bank Angle Voice Annunciations
The voice alert BANK ANGLE sounds if bank angle exceeds 35°, 40°, and 45°.
Altitude Voice Annunciations During Approach
GPWS provides the following altitude voice annunciations during approach:
• 100 feet – ONE HUNDRED
• 50 feet – FIFTY
• 30 feet – THIRTY
• 20 feet – TWENTY
• 10 feet – TEN
GPWS Windshear Alert and PWS
Windshear alerts are enabled during takeoff, approach, and landing:
• GPWS provides an immediate windshear alert when an excessive
downdraft or tailwind is occurring
• PWS provides windshear alerts when an excessive windshear condition is
detected ahead of the airplane
PWS Alert System
Weather radar uses radar imaging to detect disturbed air ahead of the airplane.
PWS alerts are enabled approximately 12 seconds after weather radar begins
scanning for windshear.
When PWS is scanning for windshear, radar antenna scan sweep is reduced.
Voice
Annunciation
Visual
Indications Description
TOO LOW,
TERRAIN
Master CAUTION
light
Amber TOO LOW
TERRAIN EICAS
message
Amber TOO LOW
TERRAIN on both
PFDs
Follows DON’T SINK alert with gear and/or
flaps up after takeoff or go-around for
altitude loss at low altitude, or
unsafe terrain clearance with gear and/or
flaps not in landing configuration at low
altitude and airspeed.
Toggling the FLAP OVRD switch to OVRD
on the GPWS page of the TCP inhibits the
alert, when the alert is due to flaps not in
landing position.
Toggling the GEAR OVRD switch to OVRD
on the GPWS page of the TCP inhibits the
alert, when the alert is due to gear not down.
787 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary 15.20.25
Prior to takeoff, PWS alerts can be enabled by pushing the WXR switch on the
EFIS control panel. On the ground with the WXR switch pushed or not pushed,
weather radar begins scanning for windshear when the thrust of either engine is in
the takeoff range and thrust reversers are not unlocked or deployed.
In flight with the WXR switch pushed or not pushed, weather radar begins
scanning for windshear below 2,300 feet radio altitude and PWS alerts are enabled
below 1,200 feet radio altitude.
When windshear is not predicted by PWS, weather radar returns are displayed
only when the WXR on the EFIS control panel is pushed.
.5 NM
1.5 NM
W
A
R
N
I
N
G
PWS ALERT AREA
30°
ON GROUND
30°
3 NM
W
A
R
N
　
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本文鏈接地址：787機(jī)組操作手冊(cè)Flight Crew Operations Manual 3(125)