EGPWS System Description
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Transcript of EGPWS System Description
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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: SHEET 9 of 57
2 DESCRIPTION AND OPERATION
2.1 GENERAL SYSTEM DESCRIPTION
The purpose for the Enhanced Ground Proximity Warning System (EGPWS) is to help prevent accidents causedby Controlled Flight Into Terrain (CFIT), obstacles, or severe windshear. The Enhanced Ground Proximity WarningComputer (EGPWC) accepts a variety of aircraft sensors and system inputs and applies alerting algorithms toprovide the flight crew with aural messages and visual annunciations when the boundaries of alerting envelopes areexceeded. A graphic depiction of terrain and obstacles within the range selected on an EFIS or Weather Radardisplay may be configured for enhanced situational awareness with respect to terrain and obstacles. Figure 2-1provides an overall system block diagram.
EGPWC
AUDIO ALERTMESSAGES
AIRCRAFT PARAMETERS
VISUAL ALERTMESSAGES
TERRAIN DISPLAYDATA
GPWSALGORITHMS
TERRAINAWARENESS
ALERTING ANDDISPLAY
ALGORITHMS
TERRAINCLEARANCE
FLOORALGORITHMS
WINDSHEARDETECTION
AND ALERTINGALGORITHMS
ALERT LAMPSOR
EFIS DISPLAY
FLIGHT DECKSPEAKERS
ANDINTERPHONE
EFIS DISPLAYOR
Wx RADARINDICATOR
AIRCRAFTSENSORS
ANDSYSTEMS
OUTPUT
PROCESSING
INPUT
PROCESSING
AURALCALLOUTS
Figure 2-1: Enhanced Ground Proximity Warning System
The EGPWS is comprised of the following:
Aircraft sensors and systems providing input signals
The Enhanced Ground Proximity Warning Computer (EGPWC)
Flight deck audio systems (speaker and interphone)
Alert lamps and/or EFIS or EICAS displays (for alert and system status messages)
EFIS Navigation Display (ND), Multi-Function Display (MFD), or Weather Radar Indicator for display of terrain
Switching relay(s) when required for switching display inputs from weather display to terrain display