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‐ TERR AHEAD (amber)
The pb light comes on, on
each pilot’s instrument panel.
* When the TERR ON ND pushbutton is selected ON, and ARC or ROSE mode is selected, the
terrain is displayed on the ND. The terrain is displayed in various densitites of green, yellow, red, or
magenta, depending on the threat. (Refer to DSC-31-45 FLAGS AND MESSAGES DISPLAYED ON
ND). If an alert is generated (caution or warning) when TERR ON ND is not selected, the terrain will
be automatically displayed and the ON light of the TERR ON ND pushbutton will come on.
Note: 1. When TERR ON ND is selected, the weather radar image is not displayed.
2. The Geometric Altitude function can protect against certain baro setting errors, provided
the components used to compute the Geometric Altitude are valid and accurate enough.
3. The TAD and Terrain Clearance Floor (TCF) functions operate using the pure lateral
GPS position and, the FMS1 position as backup.
In case of low accuracy of the aircraft position computed by the EGPWS, the enhanced modes of the
EGPWS are automatically deactivated. The five GPWS modes remain active.
TERRAIN AWARENESS AND DISPLAY
Applicable to:
The Terrain Awareness and Display (TAD) function computes a caution and a warning envelope in
front of the aircraft, which varies according to aircraft altitude, nearest runway altitude, distance to
the nearest runway threshold, ground speed, and turn rate. When the boundary of these envelopes
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 2/8
FCOM 19 AUG 10
conflicts with the terrain, or with an obstacle memorized in the database, the system generates the
relevant alert :
Alert Level Aural Warning
ND Refer to DSC-31-45
FLAGS AND MESSAGES
DISPLAYED ON ND
Local Warning
TERRAIN
AHEAD, PULL UP
Automatic ‐ terrain display
*See
‐ Solid red areas
‐ TERR AHEAD (red)
Warning
OBSTACLE
AHEAD, PULL UP
‐ Automatic terrain display
*See
‐ Solid red areas
‐ OBST AHEAD (red)
TERRAIN AHEAD
‐ Automatic terrain display
*See
‐ Solid yellow areas
‐ TERR AHEAD (amber)
Caution
OBSTACLE AHEAD
‐ Automatic terrain display
*See
‐ Solid yellow areas
‐ OBST AHEAD (amber)
On each pilot’s instrument
panel, The pushbutton
light comes on.
* When the TERR ON ND pushbutton is selected ON, and ARC or ROSE mode is selected, the
terrain and the obstacles are displayed on the ND. The terrain is displayed in various densitites
of green, yellow, red, or magenta, depending on the threat. (Refer to DSC-31-45 FLAGS AND
MESSAGES DISPLAYED ON ND). If an alert is generated (caution or warning) when TERR ON ND
is not selected, the terrain and the obstacles will be automatically displayed and the ON light of the
TERR ON ND pushbutton will come on.
Note: 1. When TERR ON ND is selected, the weather radar image is not displayed.
2. The Geometric Altitude function can protect against certain baro setting errors, provided
the components used to compute the Geometric Altitude are valid and accurate enough.
3. The TAD and Terrain Clearance Floor (TCF) functions operate using the pure lateral
GPS position and, the FMS1 position as backup.
In case of low accuracy of the aircraft position computed by the EGPWS, the enhanced modes of the
EGPWS are automatically deactivated. The five GPWS modes remain active.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 3/8
FCOM 19 AUG 10
TERRAIN AWARENESS AND DISPLAY
Applicable to:
,
,
MSN,,,
The Terrain Awareness and Display (TAD) function computes a caution and a warning envelope in
front of the aircraft, which varies according to aircraft altitude, nearest runway altitude, distance to
the nearest runway threshold, ground speed, and turn rate. When the boundary of these envelopes
conflicts with the terrain, or with an obstacle memorized in the database, the system generates the
relevant alert :
Alert Level Aural Warning
ND Refer to DSC-31-45
FLAGS AND MESSAGES
DISPLAYED ON ND
Local Warning
TERRAIN
TERRAIN PULL UP
‐ Automatic terrain
displaySee
‐ Solid red areas
‐ TERRAIN (red)
Warning
OBSTACLE
OBSTACLE, PULL UP
‐ Automatic terrain
displaySee
‐ Solid red areas
‐ OBST (red)
CAUTION TERRAIN
‐ Automatic terrain
displaySee
‐ Solid yellow areas
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 4(48)
