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and visual warnings remain until the airplane exits the envelope. Penetration of the alert
area, below 159 knots, will illuminate the GND PROX switch/lights on the glareshield,
and generate an aural “TOO LOW FLAP” warning. These alerts can be deactivated by
selecting the GPWS FLAP OVRD switch to override.
EGPWS Mode 4B
Figure 17−10−24
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−28
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
• Mode 4C is based on a minimum terrain clearance, or floor, that increases with radio
altitude during takeoff. At takeoff, the minimum terrain clearance (MTC) is at zero feet.
As the aircraft ascends, the MTC is increased to 75% of the aircraft’s current (average of
the previous 15 seconds) radio altitude. This value is limited to 500 feet AGL for
airspeeds less than or equal to 190 knots. If the airspeed is greater than 190 knots, the
MTC increases linearly with increasing airspeed up to 250 knots. Beyond 250 knots, the
MTC is limited to 1,000 feet AGL. Any decrease in altitude below minimum terrain
clearance will illuminate the GND PROX switch/lights on the glareshield, and generate
an aural “TOO LOW TERRAIN” warning.
• It is activated after takeoff when the gear or flaps are not in the landing configuration. It is
also active during a low altitude go-around, if the aircraft has descended below 245 feet
AGL.
EGPWS Mode 4C
Figure 17−10−25
Mode 5 – Descent Below Glideslope
Mode 5 provides two levels of alerting if the aircraft flight path descends below the glideslope.
The first alert occurs whenever the aircraft is more than 1.3 dots below the beam, and is called a
“soft alert” because the volume level is reduced. A second alert occurs below 300 feet radio
altitude with greater than 2 dots’ deviation, and is called a “hard alert” because the volume is
louder.
To avoid unwanted glideslope alerts when capturing the localizer between 500 and 1,000 feet
AGL, the upper limit of the alert envelope is varied in the following ways:
• Glideslope alerts are only enabled if the localizer is within ±2 dots. This allows a lateral
capture of the localizer.
• The upper altitude limit for the glideslope alert is modulated with vertical speed. For
normal descent rates above 500 FPM, the upper limit is set to the normal 1,000 feet
AGL. For descent rates lower than 500 FPM, the upper limit is desensitized to allow a
level flight capture of the localizer.
The above requirements are overridden when the aircraft descends below 500 feet AGL.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−29
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
EGPWS Mode 5
Figure 17−10−26
Alerts for Mode 5 activate the GND PROX switch/lights on the glareshield, and the aural
message “GLIDESLOPE”. Only two “GLIDESLOPE” warnings are given while in the Mode 5
outer “soft” envelope. If the conditions worsen, two more “GLIDESLOPE” aural messages
annunciate at a faster rate. This pattern continues until the inner “louder” area is penetrated (2
dots or greater deviation, below 300 feet AGL), at which time the “GLIDESLOPE” message will
become louder and continuous.
Below 150 feet AGL, glideslope alerting is desensitized to reduce the possibility of nuisance
alerts.
To permit maneuvering on final approach with an unreliable glideslope, the Mode 5 alert can be
inhibited by pressing the GND PROX/PULL UP switch/light on either side of the glareshield. The
GND PROX/PULL UP switch/light can be engaged below 2,000 feet AGL, and is automatically
reset before the next approach, provided the aircraft has descended below 30 feet or climbs
above 2,000 feet.
Mode 6 – Callouts
Mode 6 provides the following advisory alerts: transition through approach minimums, altitude
callouts on approach and excessive bank angles.
• Approach minimums: The “MINIMUMS” callout occurs as the aircraft descends
through the decision height (DH) as set on the radio altimeter. One hundred feet above
the radio altimeter DH, the “APPROACHING MINIMUMS” alert will sound.
• Altitude callouts: Specific callouts are program-pin selectable. Typical installation
includes: 1,000, 500, 50, 40, 30, 20, 10. Consult your Operating Manual for
aircraft-specific installation.
• Excessive bank angle: The excessive bank angle alert is a function of the roll angle
　
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