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“TOO LOW
TERRAIN”
MIN TERRAIN CLEARANCE (FEET)
RADIO ALTITUDE (FEET)
“TOO LOW TERRAIN”
Warning area
(<190 KNOTS)
Warning area
(>250 KNOTS)
Unsafe terrain clearance gear
down, flaps not in landing
configuration
1500 FPM climb rate
Takeoff over flat
terrain or water
NAVIGATION SYSTEMS
For Training Purposes Only
Sept 04
17-37
P I LOT T R A I N I N G GU I D E
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
1000 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 1000
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.
EGPWS Mode 5
Figure 17-25
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.
P604_17_074
1000
500
0
0 1 2 3 5
SOFT
GLIDESLOPE HARD
GLIDESLOPE
MIN TERRAIN CLEARANCE (FEET)
GLIDESLOPE DEVIATION
(DOTS FLY UP)
Mode 5 below glideslope alert
gear down
SOFT ALERT AREA
HARD ALERT
AREA
RUNWAY
GLIDESLOPE
BEAM
CENTRE
SOFT ALERT AREA
HARD ALERT AREA
NAVIGATION SYSTEMS
17-38 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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
2000 feet AGL and is automatically reset before the next approach, provided the
aircraft has descended below 30 feet or climbs above 2000 feet.
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-39
P I LOT T R A I N I N G GU I D E
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: 1000, 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
with respect to altitude above ground level. The alert envelope varies linearly from
a 10° bank at 30 feet AGL, to 40° of bank at 150 feet AGL, to 55° of bank at 2450
feet AGL. This will generate an aural “BANK ANGLE, BANK ANGLE” alert.
The alert is annunciated once, and will repeat if the bank angle increases by 20%.
The alert will be annunciated continuously if the bank angle is increased to 55°.
The alert will be annunciated until the bank angle is decreased below threshold
value
EGPWS Mode 6 Bank Angle
Figure 17-26
P604_17_075
“BANK ANGLE
BANK ANGLE”
0 +/-10 +/-30 +/-40 +/-50
　
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