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Flight Crew Operating Manual
CSP A--013
MASTER
Mode 2B is activated when flaps are in landing configuration, when making an ILS
approach with glideslope and localizer deviation less than 2 dots, and for the first 60
seconds after take-off. Penetration of the Mode 2B boundary with either gear or flaps
not in a landing configuration, activates the GND PROX lights and generates a
TERRAIN, TERRAIN aural. If the aircraft continues to penetrate the boundary the
PULL UP lights are activated and a WHOOP, WHOOP PULL UP aural is repeated until
the warning envelope is exited. <0040>
If the aircraft penetrates the Mode 2B boundary with both gear and flaps in a landing
configuration, the GPWS lights are activated and a TERRAIN aural is repeated until the
envelope is exited.
If the aircraft penetrates the Mode 2B boundary with both gear and flaps in a landing
configuration, the GND PROX lights are activated and a TERRAIN aural is repeated
until the envelope is exited.<0040>
C. Mode 3 -- Altitude Loss After Take--off
Mode 3 provides alerts when the aircraft loses a significant amount of altitude after
take-off, or low altitude go-around with gear or flaps not in a landing configuration. The
amount of altitude loss permitted before an alert is generated depends on the height of
the aircraft above the terrain.
The alert activates the GPWS lights and generates a DON’T SINK, DON’T SINK aural.
The DON’T SINK, DON’T SINK aural is only repeated if the altitude loss continues. The
GPWS lights will go out once a positive rate of climb is achieved.
The alert activates the GND PROX lights and generates a DON’T SINK, DON’T SINK
aural. The DON’T SINK, DON’T SINK aural is only repeated if the altitude loss
continues. The GND PROX lights will go out once a positive rate of climb is achieved.
<0040>
D. Mode 4 -- Unsafe Terrain Clearance
Mode 4 provides alerts for insufficient terrain clearance with respect to phase of flight,
configuration and speed. Mode 4 has three sub-modes referred to as Mode 4A, Mode
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 GPWS lights flash and the TOO LOW GEAR
aural alert is generated. If the envelope is penetrated at more than 190 knots, the
GPWS lights flash and a TOO LOW TERRAIN aural alert is generated.
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. <0040>
REV 56, Jan 31/03
Vol. 1 18--80--4
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual MASTER
CSP A--013
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 GPWS lights flash and the TOO
LOW FLAPS aural is generated. The flight crew may override the TOO LOW FLAPS
alert by selecting the GPWS 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.
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. <0040>
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
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