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Incorporation of a terrain database to predict
conflict between flight path and terrain and
to display the conflicting terrain.
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ENHANCED GROUND PROXIMITY WARNING SYSTEM PRESENTATION - PRINCIPLE
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ENHANCED GROUND PROXIMITY WARNING SYSTEM PRESENTATION
COMPONENTS
The system comprises an EGPWC, a control panel, two
warning lights and two TERRAIN ON ND mode pushbutton
switches.
The EGPWS is connected to various navigation systems
(WR, RA, ADIRS, ILS...).
It processes the navigation data and generates alarms.
TMUEGPA01-T02 LEVEL 1
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ENHANCED GROUND PROXIMITY WARNING SYSTEM PRESENTATION
INDICATING
The basic GPWS modes generate visual warnings through
associated lights and synthetic warnings through the
loudspeakers.
The "ENHANCED" GPWS functions allow the terrain hazards
to be displayed on the Navigation Display (ND).
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34 - NAVIGATION
34-48-00 EGPWS DESCRIPTION/OPERATION
CONTENTS:
General
Digital Inputs
Digital Outputs
Enhanced Function
EGPWS Controls
Aural Warnings
Visual Warnings
FWC
LGCIU
Self Examination
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EGPWS DESCRIPTION/OPERATION
GENERAL
The Enhanced Ground Proximity Warning System (EGPWS)
consists of:
- 1 computer,
- 2 GPWS / G/S pushbutton with integral lights,
- 1 GPWS control panel,
- 2 TERRAIN ON ND pushbuttons.
DIGITAL INPUTS
The EGPWS receives ARINC 429 data inputs from the
navigation sensors in order to monitor the aircraft
position with respect to the terrain and provide audio
and visual warnings when in hazardous situation.
DIGITAL OUTPUTS
An ARINC 429 transmitter provides a maintenance output
data bus.
This output bus is used by the CFDIU for maintenance
purposes and by the Aircraft Integrated Data System
(AIDS) for the Data Management Unit (DMU).
ENHANCED FUNCTION
The EGPWC outputs a display of terrain data in ARINC
453 data bus format to the DMCs.
The terrain data is displayed on the ND automatically
in place of the radar image when a Terrain Caution or
Warning is detected or any time by using the TERR ON
ND pushbutton.
The EGPWS receives the Predictive Windshear (PWS)
alerts from the weather radar hazard bus to determine
the priority. The PWS has priority over EGPWS modes.
EGPWS CONTROLS
Various pushbuttons allow the crew to control the
actions of the EGPWS.
When pressed in, on the GPWS control panel:
- The TERR p/b (white legend) inhibits the
terrain awareness.
- The SYS p/b (white legend) inhibits all the
GPWS warnings (mode 1 to 5).
- The G/S MODE p/b (white legend) inhibits the
glide/slope mode (mode 5).
- The FLAP MODE p/b (white legend) inhibits flap
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