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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 FMS 1 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A330/A340 FLEET DSC-34-70-30 P 3/6
FCOM 19 AUG 10
TERRAIN CAUTION AND WARNING ENVELOPE BOUNDARIES
Applicable to: ALL
VERTICAL ENVELOPE
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A330/A340 FLEET DSC-34-70-30 P 4/6
FCOM 19 AUG 10
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.
If the airplane descends below this floor, a TOO LOW TERRAIN aural warning sounds, and the
GPWS lights come on, on the glareshield.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
A330/A340 FLEET DSC-34-70-30 P 5/6
FCOM 19 AUG 10
RUNWAY FIELD CLEARANCE FLOOR
Applicable to: ,
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - EGPWS FUNCTIONS
Intentionally left blank
A330/A340 FLEET DSC-34-70-30 P 6/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - CONTROLS AND INDICATORS
A330/A340 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
lt
: This amber light comes on, along with an ECAM caution, if the GPWS
malfunctions.
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: Glide slope mode (mode 5) is inhibited.
(3) FLAP MODE pushbutton
OFF: Flap mode ("TOO LOW FLAPS" mode 4) is inhibited.
(To avoid nuisance warning in case of landing with reduced flaps setting).
Moreover if LDG CONF 3 is selected on MCDU the flap mode will be automatically
inhibited when FLAPS 3 position is reached.
(4) 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.
FAULT lt : This amber light comes on, along with an ECAM caution, if the TAD or TCF
mode fails. The basic GPWS mode 1 to mode 5 are still operative, if the SYS
pushbutton is not OFF or the SYS FAULT lights are not illuminated.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-34-70-40 P 2/4
FCOM 19 AUG 10
MAIN INSTRUMENTS PANEL
Applicable to: ALL
(1) PULL UP – GPWS pushbutton
PULL UP : Comes on to give a visual indication, when a PULL UP warning alert is
triggered in modes 1, 2, and TAD. The corresponding aural warning sounds.
GPWS : Comes on amber, when any other mode is activated.
The corresponding aural warning sounds.
Note: 1. If the flight crew briefly presses this button when the GPWS light is on, following
a mode 5 GLIDE SLOPE alert. The GPWS light goes off, and the aural warning
stops.
2. The GPWS can be tested by pressing this pushbutton. If the pushbutton is briefly
pressed, some of the aural warnings sound and pushbutton captions, related to the
GPWS, come on. If the pushbutton is pressed continuously, then all of the aural
warnings sound.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-34-70-40 P 3/4
FCOM 19 AUG 10
(2) TERR ON ND pushbutton
These pushbuttons are located on either side of the ECAM. Each pushbutton controls the
　
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