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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 10 of 68
2 DESCRIPTION AND OPERATION
2.1 GENERAL SYSTEM DESCRIPTION
The purpose for the Enhanced Ground Proximity Warning System (EGPWS) is to help prevent accidents caused by
Controlled Flight Into Terrain (CFIT), obstacles, or severe windshear. The Enhanced Ground Proximity Warning
Computer (EGPWC) accepts a variety of aircraft sensors and system inputs and applies alerting algorithms to
provide the flight crew with aural messages and visual annunciations when the boundaries of alerting envelopes are
exceeded. A graphic depiction of terrain and obstacles within the range selected on an EFIS or Weather Radar
display may be configured for enhanced situational awareness with respect to terrain and obstacles.
Figure 2-1
provides an overall system block diagram.
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
• GPS antenna for direct connection to EGPWC with internal GPS sensors