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The crew can select the FLAP mode pb sw
OFF to inhibit GPWS flap warnings.
If the FLAP mode is OFF, the green FLAP
MODE OFF message is displayed on the E/WD.
NAVIGATION MENU
GPWS presentation 22/35
When selected OFF, the G/S MODE
pb sw will inhibit the GPWS glide slope
warning.
NAVIGATION MENU GPWS presentation 23/35
The white OFF light illuminates when
the GPWS is selected off. All warnings
are inhibited.
NAVIGATION MENU GPWS presentation 24/35
If your aircraft is equipped with the
Enhanced GPWS (EGPWS), a forward
looking capability for terrain is added. The
basic functions, we have just studied,
remain unchanged.
EGPWS is based on terrain database and
FMGC current position, not on radar
returns.
The purpose of the EGPWS is to avoid a
Control Flight Into Terrain and to give
enough time to the crew to perform an
avoidance manoeuvre.
NAVIGATION MENU
GPWS presentation 25/35
++ 22000000 fftt
++ 11000000 fftt
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- 250 ft when gear down
- 500 ft when gear up
-- 11000000 fftt
-- 22000000 fftt
Unnkknnoownn aarreeaass
The terrain information is displayed on the ND except in PLAN mode.
A different image texture, an image display which sweeps from center outward
to both ND sides and a “TERR” indication instead of the radar “TILT”indication
help the crew to make the difference between the EGPWS terrain computed data
and the ground picture sensed by the radar.
The terrain elevation surrounding the aircraft is color coded.
NAVIGATION MENU GPWS presentation 26/35
Two TERR ON ND pb sw are fitted on
each side of the main panel.
To display the terrain picture on his
ND, a pilot will have to switch on his
respective TERR ON ND pb sw.
Note that the weather radar information
is replaced even if it is switched on.
NAVIGATION MENU GPWS presentation 27/35
In the lights out position, the EGPWS operation is fully automatic.
The TERR pb sw, in the OFF position allows the crew to inhibit the
“enhanced” functions but keeps the basic GPWS functions operative.
In case of failure of the “enhanced” functions, the FAULT light comes on but
the basic GPWS functions remain operative.
As for the basic GPWS, the SYS pb sw controls the basic functions.
NAVIGATION MENU GPWS presentation 28/35
The EGPWS uses a terrain database coupled with a FMGS position to
calculate two terrain envelopes ahead of the aircraft. When a conflict is detected
between these terrain envelopes and the terrain memorized in the database, an
alert is triggered.
One terrain envelope corresponds to a caution level while the second one to a
warning level.
NAVIGATION MENU GPWS presentation 29/35
NAVIGATION MENU GPWS presentation 30/35
• If the caution terrain envelope is penetrated, the areas which violate the
caution envelope limits turn to a solid yellow color.
• An amber “TERR AHEAD” message appears and a repeated “TERRAIN
AHEAD” aural alert is generated.
• If the terrain warning envelope is penetrated, the areas which violate the
warning envelope turn to a solid red colour.
A red “TERR AHEAD” message appears and a repeated “TERRAIN AHEAD,
PULL UP” aural alert is generated.
In both cases, the red GPWS lights will illuminate.
NAVIGATION MENU
GPWS presentation 31/35
As for the basic GPWS warnings, crews should react
immediately without attempting to assess its validity.
NAVIGATION MENU
GPWS presentation 32/35
In case of caution or warning, if TERR ON ND is not
selected on, the terrain display is set automatically to on
and the ON light on the TERR ON ND pb sw comes on.
NAVIGATION MENU GPWS presentation 33/35
The second EGPWS protective function
provides a terrain clearance floor envelope
for each runway stored in the database.
This function warns a premature descent
below this floor regardless of aircraft
configuration.
Runway
NAVIGATION MENU GPWS presentation 34/35
CAUTION:
• The relative height is calculated using the
Captain baro setting. Thus, the system does
not protect against baro setting errors.
• The position is calculated using FM 1. The
system does not protect against FM 1
position errors.
NAVIGATION MENU GPWS presentation 35/35 NEXT
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When the aircraft position accuracy,
provided by the FMGS, is not sufficient,
the "enhanced" functions of the
EGPWS are automatically deselected.
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