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between 2450 feet and 10 feet radio altitude. The type of
annunciation depends on the rate of descent and the radio
altitude. The first annunciation is a caution. If the rate of descent
does not decrease, the annunciation changes to a warning.
The LRUs that supply inputs for mode 1 operation are the radio
altimeter transceivers and the left and right ADIRUs.
The GPWC uses this data to detect mode 1 cautions and
warnings:
* Radio altitude
* Inertial vertical speed
* Barometric altitude rate.
The mode detector in the GPWC calculates the descent rate
from the inertial vertical speed input. If it is not available, the
mode detector uses an internally calculated altitude rate. If the
IVS and the internally calculated rates are invalid, the
barometric altitude rate from the ADIRU is used. When the
GPWC uses barometric altitude rate, the lower altitude cutoff
changes from 10 feet to 30 feet.
When there is a caution or warning condition, the mode detector
sends a discrete to the speech prom to make the aural
messages come on. The aural messages go to the remote
electronics unit (REU) which sends them to the flight
compartment speakers.
Caution and warning conditions cause the mode detector to
send a signal on the ARINC 429 transmitter to the DEUs to show
the PULL UP display.
When the GPWC gives an aural message, a discrete goes to the
TCAS computer to inhibit TCAS aural messages.
GPWS - MODE 1 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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GPWS - MODE 1 FUNCTIONAL DESCRIPTION
GPWS - MODE 1 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-010
Purpose
Mode 2 supplies alerts and warnings when the closure rate to
the terrain is too large. Mode 2 has two submodes, mode 2A
and mode 2B.
Description
Mode 2A occurs for a large closure rate if the flaps are not in the
landing configuration and glideslope deviation is more than 2
dots. Flaps 30 or more is a landing configuration. Mode 2A can
have two alert levels, a caution condition or a warning
condition.
If the terrain closure is too large, the GPWC gives the TERRAIN
aural caution message twice and PULL UP shows on the
primary flight display (PFD).
If the condition is not corrected, the caution aural message
changes to the warning WHOOP WHOOP PULL UP message
and PULL UP still shows on the PFD.
When the mode 2A envelope is no longer active due to either a
terrain drop off or a pull up maneuver by the flight crew, the
altitude gain function operates. PULL UP continues to show on
the PFD until the altitude increases 300 feet or 45 seconds have
elapsed. If there is still a terrain closure rate during this period,
however, the GPWC also gives the TERRAIN aural caution
message.
After a 300 feet increase in inertial altitude or the landing gear
comes down, the PULL UP indications on the PFD stop and the
aurals warnings stop.
GPWS - MODE 2A DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-011
GPWS - MODE 2A DESCRIPTION
GPWS - MODE 2A DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-011
Purpose
Mode 2B gives alerts for a large closure rate if the flaps are in
the landing configuration (30 units or more).
Description
Mode 2B can have a caution condition or a warning condition.
If the terrain closure is excessive, the ground proximity warning
computer (GPWC) gives the TERRAIN aural caution message
repeatedly. If this condition lasts for more than 1.6 seconds, the
GPWC gives the WHOOP WHOOP PULL UP aural warning
messsage and a PULL UP annunciation on the PFD.
If the terrain closure is excessive and the landing gear is
extended, the PULL UP aural warning message is replaced with
the TERRAIN aural caution message.
GPWS - MODE 2B DESCRIPTION
EFFECTIVITY
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