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ADC 1,2,3
AIR DATA COMPUTER
SYSTEM
ALT>15000FT
DAU 4
EICAS
ADVISORY
DISCRETES
FLIGHT
DATA
RECORDER
TA/RA DISPLAY DATA 2
TA/RA DISPLAY DATA 1
IAC 1,2,3
For Training Purposes Only
Sept 04
16-45
P I LOT T R A I N I N G GU I D E
NAVIGATION
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS)
The primary purpose of the EGPWS is to provide alerts and warnings to avoid
controlled flight into terrain, and to provide detected windshear warning.
The EGPWS is categorized into 7 modes. The basic GPWS function is comprised of
modes 1 through 6. The windshear function and the enhanced feature, terrain
awareness alerting and display function is mode 7. Mode 7 is what promotes a basic
GPWS to EGPWS.
The Enhanced Ground Proximity Warning Computer (EGPWC) processes all inputs
and provides all aural and visual alerts and warnings. The following priority, from
highest to lowest, is used to determine which annunciation is displayed if more than
one is active:
An alert annunciation indicates potential for impact with terrain. A warning
annunciation indicates a prediction for impact with terrain. All annunciations are
displayed on pilot’s and copilot’s PFDs.
The MFD control panel provides for the selection of the Terrain display on the
respective MFD.
For more information, see Chapter 7, Electronic Display Systems.
WIND
SHEAR
PULL
UP
GND
PROX
WIND
SHEAR
GX_16_056
TCAS MENU
EMER
TERR
MAP
PLAN
NAV
APT
NORM ABN
SKP
RCL
PAG
ENT
GX_16_057
TERR Button
Used to enable terrain display.
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-46 For Training Purposes Only
Sept 04
The EGPWS control panel provides for the selection of G/S WARN (MUTED), FLAP
OVRD (OVRD) and TERRAIN (OFF).
EGPWS
TERRAIN
OFF
G/S WARN
MUTED
FLAP OVRD
OVRD
GX_16_058
G/S WARN Switch
Used to mute glideslope
warning. Localizer only
approach.
FLAP OVRD Switch
Used to mute flap aural warning
when flaps are not properly
configured for landing.
TERRAIN Switch
Used to inhibit terrain clearance floor,
terrain awareness alerting and display
functions (in a case where landing at
an airport, that is not in the database).
For Training Purposes Only
Sept 04
16-47
P I LOT T R A I N I N G GU I D E
NAVIGATION
EGPWS MODES
EGPWS modes are as follows:
Mode 1 – Excessive Descent Rate
Mode 1 provides aural and visual alerts and warnings in the event that the EGPWC
determines that the rate of descent is excessive with respect to airplane altitude. The
mode is active when the airplane is less than 2500 feet AGL. Mode 1 uses radio
altitude and vertical speed inputs.
The annunciation envelope consists of two areas: alert and warning.
• Penetration of the alert area will annunciate a GND PROX alert on the PFD and
generate an aural “SINKRATE SINKRATE”. The aural alert will be annunciated
once, and will be repeated only if condition degrades by more than 20% based on
computed time to impact. The visual alert will remain until the condition is
rectified
• Penetration of the warning area will annunciate a EGPWS alert on the PFD and
generate an aural “WHOOP, WHOOP, PULL UP” warning. The aural warning is
annunciated continuously until the condition is rectified
GX_16_059
20 20
10 10
20 20
10 10
GND
PROX
PULL
UP
“SINKRATE
SINKRATE”
”
“
“PULL UP
PULL UP”
”
“
2500
2000
1500
1000
500
0
2000 4000 6000 8000
DESCENT RATE (FEET/MINUTE)
10000
“PULL UP”
3000
“SINKRATE”
RADIO ALTITUDE (FEET)
“SINKRATE, SINKRATE”
“PULL UP”
“SINKRATE”
“PULL UP”
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-48 For Training Purposes Only
Sept 04
Mode 2 – Excessive Terrain Closure Rate
Mode 2 provides alerts and warnings when the EGPWC detects that the closure rate
between the airplane and terrain is excessive. The airplane need not be in descent,
rising terrain may be encountered in level flight, or the terrain may be rising at a rate
greater than the airplane rate of climb. Mode 2 uses radio altitude and vertical speed
inputs.
Mode 2 has two submodes: Mode 2A and Mode 2B.
　
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