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minimum terrain clearance floor, the GPWS lights flash and the TOO LOW TERRAIN
aural is generated.
Mode 4C is active during the take-off phase with either gear or flaps not in the landing
configuration. Mode 4C alerts the pilot when the terrain is rising more steeply than the
aircraft is climbing. Mode 4C is based upon a minimum terrain clearance floor, that
increases with radio altitude. If the aircraft radio altitude decreases to the value of the
minimum terrain clearance floor, the GND PROX lights flash and the TOO LOW
TERRAIN aural is generated. <0040>
The GPWS lights will continue to flash until the alert envelope is exited. Subsequent
alerts will only occur if the envelope penetration increases by 20%.
The GND PROX lights will continue to flash until the alert envelope is exited.
Subsequent alerts will only occur if the envelope penetration increases by 20%. <0040>
E. Mode 5 -- Below Glideslope Alert
Mode 5 provides two levels of alerting during airplane descents below the glideslope on
front course ILS approaches.
The first alert level occurs when the aircraft is more than 1.3 dots below the glideslope
and is called a “soft” alert. The GPWS lights flash and the GLIDESLOPE aural is
generated at approximately one half the volume of other aurals.
The first alert level occurs when the aircraft is more than 1.3 dots below the glideslope
and is called a “soft” alert. The GND PROX lights flash and the GLIDESLOPE aural is
generated at approximately one half the volume of other aurals. <0040>
Vol. 1 18--80--5
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual
CSP A--013
MASTER
The second alert level occurs when the aircraft is below 300 feet radio altitude and is
more than 2 dots below the glideslope and is called a “hard” alert. The GPWS lights
flash and the GLIDESLOPE aural is generated at the normal aural volume.
The second alert level occurs when the aircraft is below 300 feet radio altitude and is
more than 2 dots below the glideslope and is called a “hard” alert. The GND PROX
lights flash and the GLIDESLOPE aural is generated at the normal aural volume. <0040>
The GPWS lights will go out once the glideslope deviation is less than 1.3 dots.
The GND PROX lights will go out once the glideslope deviation is less than 1.3 dots.
<0040>
Mode 5 can be inhibited by pushing either GPWS / G/S light while the aircraft is below
1000 feet radio altitude. Modes 1 through 4 aurals have priority over Mode 5 aurals.
Mode 5 can be inhibited by pushing either PULL UP / GND PROX light while the aircraft
is below 2000 feet radio altitude. Modes 1 through 4 aurals have priority over Mode 5
aurals. <0040>
F. Mode 6 -- Callouts
Mode 6 provides different combinations of programmable advisory callouts covering the
following:
(1) Transition through DH
Radio altitude transition through the highest DH selected for display on either
PFD prompts a minimums---type aural. The function is enabled between 1000
and 10 feet AGL. The landing gear must be down to activate the callouts.
Radio altitude transition through the highest DH selected for display on either
PFD prompts a minimums---type aural. The function is enabled between 1000
and 10 feet AGL. Barometric altitude transition through the highest MDA selected
for display on either PFD also prompts a minimums---type aural. MDA callout
generation is enabled once the corrected altitude exceeds the MDA value by 200
feet. If both DH and MDA have been selected, the callout will be generated
based on DH. The landing gear must be down to activate the callouts. <0040>
(2) Altitude Callouts
The altitude callout function generates aurals for descent below predetermined
altitudes. Altitude callouts are generated only once and are reset by ascending to
1000 feet, or in the event that a transition from approach mode to take-off mode
occurs.
(3) Excessive Bank Angle Alerting <0040>
Excessive bank angle alerting is a function of roll angle with respect to altitude
above ground level. Upon penetration of the alert envelope boundaries, the
BANK ANGLE, BANK ANGLE aural is generated. The aural is issued once, and
only repeated if the roll angle increases by 20%. <0040>
REV 56, Jan 31/03
Vol. 1 18--80--6
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual MASTER
CSP A--013
G. Mode 7 -- Windshear Detection and Alerting
Mode 7 monitors for windshear conditions during take-off and final approach between
radio altitudes of 10 to 1500 feet.
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