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‐ TERRAIN (amber)
Caution
CAUTION OBSTACLE
‐ Automatic terrain
displaySee
‐ Solid yellow areas
‐ OBST (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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 4/8
FCOM 19 AUG 10
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 CAUTION AND WARNING ENVELOPE
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 5/8
FCOM 19 AUG 10
VERTICAL ENVELOPE
HORIZONTAL ENVELOPE
TERRAIN CLEARANCE FLOOR
Applicable to: ALL
A terrain clearance floor envelope is stored in the database for each runway for which terrain data
exist. The Terrain Clearance Floor (TCF) function warns of a premature descent below this floor,
regardless of the aircraft's configuration.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 6/8
FCOM 19 AUG 10
If the airplane descends below this floor, a TOO LOW TERRAIN aural warning sounds and the
pushbutton light comes on, on the glareshield.
RUNWAY FIELD CLEARANCE FLOOR
Applicable to:
,
,
MSN,,,,
The Runway Field Clearance Floor (RFCF) provides an additional envelope protection, for runways
that are significantly higher than the surrounding terrain. It is contained in a circle within the 5.5 nm of
the runway threshold and it is based on the geometric altitude and the runway elevation.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A318/A319/A320/A321 FLEET DSC-34-70-30 P 7/8
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-34-70-30 P 8/8
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-34-70-40 P 1/4
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) SYS pushbutton
OFF : All basic GPWS alerts (Mode 1 to 5) are inhibited.
FAULT
light
: This amber light comes on, along with an ECAM caution, if the basic GPWS
mode 1 to 5 malfunction.
Note: If ILS 1 fails, only mode 5 is inhibited. Consequently, the FAULT light does not come
on and the GPWS FAULT warning is not triggered.
(2) G / S MODE pushbutton
OFF : Glideslope mode (mode 5) is inhibited.
(3) FLAP MODE pusbutton
OFF : Flap mode (“TOO LOW FLAPS” mode 4) is inhibited.
(To avoid nuisance warning in case of landing with flaps setting reduced).
(4) LDG FLAP 3 pushbutton
ON : Flap mode is inhibited when FLAPS CONF 3 is selected (to avoid nuisance
warning in case of landing in CONF 3).
In this case, LDG MEMO displays "FLAPS ... 3" instead of “CONF ... FULL”.
(5) TERR pushbutton
OFF : Inhibits the Terrain Awareness Display (TAD) and Terrain Clearance Floor (TCF)
modes, and does not affect the basic GPWS mode 1 to 5. If OFF is selected the
ECAM caution NAV GPWS TERR DET FAULT is displayed.
FAULT
light
: This amber light comes on, along with an ECAM caution, if the TAD or TCF mode
fails. The terrain is not shown on the ND. The basic GPWS mode 1 to mode 5 are
　
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