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4B and Mode 4C.
Mode 4A is active during cruise and approach with the gear and flaps not in the landing
configuration. The boundary for Mode 4A is 500 feet radio altitude and increases
linearly with airspeed, to a maximum of 1000 feet radio altitude. If the envelope is
penetrated at less than 190 knots, the GND PROX lights flash and the TOO LOW
GEAR aural alert is generated. If the envelope is penetrated at more than 190 knots,
the GND PROX lights flash and a TOO LOW TERRAIN aural alert is generated. <2040>
Mode 4B is active during cruise and approach, with gear down and flaps not in the
landing configuration. The boundary for Mode 4B is 245 feet radio altitude and
increases linearly with airspeed, to a maximum of 1000 feet radio altitude. If the
envelope is penetrated at less than 159 knots, the GND PROX lights flash and the TOO
LOW FLAPS aural is generated. The flight crew may override the TOO LOW FLAPS
alert by selecting the GND PROX FLAP OVRD. If the envelope is penetrated at more
than 159 knots, the GND PROX lights flash and the TOO LOW TERRAIN aural alert is
generated. <2040>
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. <2040>
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%. <2040>
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 GND PROX lights flash and the GLIDESLOPE aural is
generated at approximately one half the volume of other aurals. <2040>
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. <2040>
The GND PROX lights will go out once the glideslope deviation is less than 1.3 dots.
<2040>
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. <2040>
Vol. 1 18--80--6
NAVIGATION SYSTEMS
Ground Proximity Warning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
F. Mode 6 -- Callouts
Mode 6 provides different combinations of programmable advisory callouts covering the
following:
S Transition through approach minimums
S Altitude Callouts on Approach
S Excessive Bank Angle
(1) Transition through approach
Mode 6 provides audio alerts for descent below minimums altitude, DH or MDA,
and prompts a voice warning. The function is enabled between 1000 and 10 feet
radio altitude for DH callouts and when corrected altitude exceeds the MDA value
by 200 feet. The landing gear must be down to activate the callouts.
(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
If enabled, 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 then only repeated if the roll angle increases by 20%.
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.
Windshear warnings are triggered for tail wind and down draft conditions. Windshear
warnings generate a siren, a WINDSHEAR, WINDSHEAR, WINDSHEAR aural and a
red WINDSHEAR warning on the primary flight displays (PFDs).
Windshear alerts are triggered for headwind and updraft conditions. Windshear alerts
generate a amber WINDSHEAR alert on the PFDs.
Flight director command bars provide escape guidance automatically when a windshear
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