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airspeed is less than 190 knots and it is 1000 feet at high
airspeed. The mode 4A aural message TOO LOW GEAR
changes to the aural message TOO LOW TERRAIN when the
airspeed is more than 190 knots.
The Mode 4B alert occurs if the landing gear is down and the
flaps are not in a landing configuration below the altitude limit
(landing configuration for the flaps is 30 units or more). The
Mode 4B altitude limit is 245 feet when the airspeed is less than
159 knots and it is 1000 feet at high airspeed. The mode 4B aural
message TOO LOW FLAPS changes to the aural message TOO
LOW TERRAIN when the airspeed is more than 159 knots.
The LRUs that supply inputs for mode 4 are:
* Left and right radio altimeter transceivers
* Left ADIRU IRS and air data buses
* Stall management yaw damper computers (SMYD)
* Landing gear handle switch
* GPWS module.
The GPWC uses this data to detect mode 4 alerts:
* Radio altitude
* Computed airspeed
* Flap angle
* Gear position.
When there is a Mode 4 condition, the mode detector sends a
discrete to the speech PROM to make the aural message come
on. The aural message goes to the REU which sends it to the
flight compartment. When the GPWC gives an aural message, a
discrete goes to the TCAS computer to inhibit TCAS aural
messages. The mode detector also sends a discrete on an
ARINC 429 data bus to the DEUs to show the PULL UP message
for any Mode 4 alert condition.
Mode 4 changes to mode 3 if the airplane goes below 245 feet in
landing configuration (flaps down and gear down).
GPWS - MODE 4 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The GPWC gives a mode 5 alert when the airplane goes below
the glideslope during approach if the landing gear is down.
Description
For mode 5 alerts, the GPWC gives the aural message
GLIDESLOPE and the below glideslope lights come on. The
volume level of the aural message increases and the message
repeats faster as the terrain gets closer. You push the
glideslope inhibit switch to inhibit or cancel mode 5 alerts.
GPWS - MODE 5 DESCRIPTION
EFFECTIVITY
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General
Mode 5 alerts can occur between 1000 and 30 feet radio altitude.
The interval between aural messages depends on altitude and
glideslope deviation. Low volume audio occurs below 1000 feet
down to 30 feet when the deviation is more than 1.3 dots.
Normal volume audio occurs below 300 feet when the deviation
is more than 2 dots.
These LRUs supply inputs for mode 5 operation:
* Radio altimeter transceivers
* DFCS mode control panel
* Landing gear handle switch
* MMRs
* FMCS
* GPW module.
The GPWC uses this data to calculate mode 5 alerts:
* Radio altitude.
* Selected runway heading
* Gear position
* Magnetic track
* Localizer and glideslope deviation
When there is an alert condition, the mode detector sends a
discrete to the speech prom to make the aural message. The
aural message goes to the REU which sends it to the flight
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