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the fault occurs. If there is a fault in any other GPWS mode, the alerts are inhibited
for the mode in which the fault occurs, but there is no indication to the flight crew
of which modes are inhibited. GPWS will provide alerts for the modes for which
no fault has occurred.
Alert Inhibits
Alerts are inhibited when they are operationally unnecessary or inappropriate.
Alerts are also inhibited during part of the takeoff to prevent distracting the crew.
Alert Messages Inhibited By Other Alert Messages
Some EICAS alert messages are inhibited if another related alert message is
displayed. For example, individual fuel or hydraulic pump pressure messages are
inhibited if a hydraulic system pressure message is displayed.
Certain alert messages are time delayed, even though related flight deck panel
annunciation lights are illuminated. Time delay inhibits prevent normal in–transit
indications from being displayed as EICAS system alert messages. For example,
valves are generally only sensed open and/or closed, not in–transit. When a valve
is in–transit, the alert 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 period, the respective
EICAS alert message is displayed.
Aural Alert Visual Alert Description
Two–tone siren
followed by
WINDSHEAR,
WINDSHEAR,
WINDSHEAR
Red WINDSHEAR
on both PFDs
Red WINDSHEAR
message on both
NDs
Master WARNING
lights
Excessive windshear detected by GPWS.
Enabled below 1,500 feet radio altitude.
GPWS windshear detection begins at
rotation.
April 01, 2001
747 Operations Manual
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.17
Alerts Inhibited Before Engine Start and After Shutdown
Alerts Inhibited During Engine Start
Alert Inhibited For Message Inhibit Occurs
Master CAUTION lights
Beeper
For all EICAS caution
messages
On the ground, and
all FUEL CONTROL
switches CUTOFF.
Respective EICAS
messages:
ELEC GEN OFF
ENG CONTROL,
ENG EEC MODE
ENG FAIL
ENG OIL PRESS
NAI VALVE
For EICAS caution
messages:
ENG SHUTDOWN
On the ground, and
respective FUEL
CONTROL switch in
CUTOFF or Engine Fire
switch out.
Alert Inhibited Inhibit Begins Inhibit Ends
All new EICAS caution and advisory
messages, except:
BLEED
ENG AUTOSTART
ENG FUEL VALVE
ENG SHUTDOWN
ENG START VLV
STARTER CUTOUT
Engine START
switch pulled.
Engine reaches idle RPM,
or
start is aborted, or
five minutes elapse.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.20.18 D6-30151-425
Warning Systems -
System Description
Alerts Inhibited During Takeoff
If the Master WARNING lights are illuminated and the siren or fire bell sound
before reaching V1, they continue to be illuminated and to sound when V1 is
exceeded.
If the Master CAUTION lights are illuminated before reaching V1, they continue
to be illuminated when V1 is exceeded and cannot be reset until the inhibit ends.
Alert Inhibited For Message Inhibit
Begins
Inhibit Ends
STATUS cue All EICAS new
status messages
Engine
start
30 minutes after lift-off
Master CAUTION
lights
Beeper
All EICAS caution
messages
80 knots
airspeed
400 feet radio altitude or 20
seconds after rotation,
whichever occurs first.
If rejected takeoff initialed
above 80 knots, inhibit
continues until airspeed is
less than 75 knots.
All EICAS advisory
messages
(Messages are
inhibited)
80 knots
airspeed
400 feet radio altitude or 20
seconds after rotation,
whichever occurs first, or
if takeoff thrust not selected
on both engines.
If rejected takeoff initialed
above 80 knots, inhibit
continues until airspeed is
less than 75 knots.
Master WARNING
lights
Bell
FIRE V1 400 feet radio altitude or 25
seconds after V1,
whichever occurs first.
Master WARNING
lights
Siren
CABIN ALTITUDE
OVERSPEED
V1 400 feet radio altitude or 25
seconds after V1,
whichever occurs first.
Master WARNING
lights
Siren
EICAS warning
message CONFIG
　
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