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abnormal condition input (mode 4) and generates
the green "GPWS FLAP MODE OFF" message on the
ECAM MEMO page (EWD).
- The LDG FLAP 3 p/b (white legend) selects the
landing FLAP 3 position and generates the green
"GPWS FLAP 3" message on the ECAM MEMO page
(EWD).
When pressed in the GPWS / G/S p/b, on the instrument
panels, has two functions:
- The GPWS / G/S p/b sends a ground signal to
trigger the self test sequence (available on
ground or above 2000 ft Above Ground Level:
AGL),
- or cancels the glide/slope aural and visual
warnings when triggered.
When the TERRAIN ON ND p/b is pressed in, on the center
instrument panel, the green ON legend comes on to
indicate that terrain data is displayed on the ND.
TMUEGPC01-T01 LEVEL 3
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EGPWS DESCRIPTION/OPERATION
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EGPWS DESCRIPTION/OPERATION
AURAL WARNINGS
The audio output is used to broadcast aural warning
messages which identify the activated mode.
The ECAM control panel sends an audio suppression
signal, when the EMERG CANCEL p/b is pressed, to the
EGPWC in order to momentarily cancel the EGPWS
warnings.
VISUAL WARNINGS
In hazardous flight configurations or system failures
the EGPWC provides discretes for the illumination of
warning legends.
Five discretes control the warning legends:
- One for red GPWS legends, for ground proximity
warning (mode 1 to 4) and for Terrain Caution
and Warning Alert.
- One for amber G/S legends, for Glide/Slope
advisory alert (mode 5).
- Two monitor outputs for the amber FAULT legends
on the SYS and TERR p/b of the GPWS control
panel.
These discretes are also sent to the System
Data Acquisition Concentrators (SDACs) to
generate the ECAM "GPWS FAULT" and "GPWS TERR
DET FAULT" warning messages.
- One monitor output for the availability of the
terrain mode.In case of FMS low accuracy a
green TERR STBY is sent through the SDACs to
the ECAM MEMO page (EWD).
FWC
The Flight Warning Computers (FWCs) send a discrete
to the EGPWC to inhibit all warnings when a stall or
windshear warning is triggered.
The EGPWC sends two discretes to the FWCs and the TCAS
in order to inhibit auto call out and low speed warnings
and change TCAS mode from Resolution Advisory (RA) to
Traffic Advisory (TA) when the GPWS or G/S warnings
are in progress.
These discretes are also used by the Digital Flight
Data Recorder (DFDR).
LGCIU
The Landing Gear Control Interface Unit sends a
flight/ground discrete signal to the EGPWC BITE mode
to count the flight legs.
This discrete is also used for Mode 4 (Unsafe Terrain
Clearance).
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SELF EXAMINATION
What happens to the EGPWS when the stall warning is
triggered?
A - All modes are inhibited.
B - Mode 4 is inhibited.
C - Mode 5 is inhibited.
What happens when the G/S p/b is pressed in on the
GPWS control panel?
A - The Glide/Slope mode is inhibited.
B - Only Glide/Slope mode is valid.
C - The self test sequence is initiated.
What happens when the TERR ON ND p/b is pressed in?
A - The ND displays the terrain image.
B - The terrain image is superposed with the
radar image on the ND.
C - The radar image is present until a
terrain caution or warning is detected.
The EGPWS has priority over:
A - All systems.
B - Auto call out, low speed warning and
TCAS.
C - Stall and windshear.
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TMUEGPC01 LEVEL 3
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34 - NAVIGATION
　
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