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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 B–1
Enhanced Ground–Proximity Warning System (EGPWS)
Appendix B
Enhanced Ground–Proximity
Warning System (EGPWS)
The AlliedSignal Mark VII EGPWS combines information from aircraft
navigation equipment (i.e. flight management system (FMS), inertial
reference system (IRS), global positioning system (GPS), radio
altimeter) with a stored terrain data base that alerts the pilot to
potentially dangerous ground proximity.
In addition to the verbal alert, the EGPWS can display the terrain data
on the weather radar indicator. Depending on the installation, the pilot
pushes a button to display the terrain, or the terrain data is automatically
displayed when a Terrain Alert occurs.
SYSTEM OPERATION
To display the EGPWS, the weather system can be in any mode except
OFF. When the EGPWS is active, the indicator range up and down
arrows control the EGPWS display range. The AZ button on the
indicator is also active and the azimuth lines can be displayed or
removed.
The other radar controls do not change the terrain display, but if they
are used while the EGPWS is displayed, they control the radar receiver
transmitter antenna (RTA), and the effect is displayed when the system
returns to the radar display.
EGPWS Controls
The typical EGPWS installation has remotely mounted push button
controls and status annunciators that are related to the display on the
radar indicator. The paragraphs below give a functional description of
the AlliedSignal recommended controls.