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880 Digital Weather Radar System
A28--1146--102--03
REV 3
B--3
Enhanced Ground--Proximity Warning System (EGPWS)
Useor disclosure ofthe informationonthis pageiss ubject to therestrictions onthetitlepage ofthisdocument.
Related EGPWS System Operation
Some installations may have a DATA--NAV (navigation display, and/or
checklist), lightning sensor system (LSS), and/or traffic alert and crew
alerting system (TCAS) that already share the radar indicator’s display
by way of the Universal Digital Interface (UDI) connector. These
systems have priority for access to the radar display screen. These
systems data may be overlaid on the EGPWS display, or they may
simply override the EGPWS display.
EGPWS Operation
The EGPWS system may vary, depending on the installed controls and
software level of the EGPWS computer.
In some installations, the EGPWS display on the radar indicator is
manually operated. It is only displayed if the pilot pushes the ON button,
and it is removed if the pilot pushes the ON button a second time.
In some installations, the EGPWS display has a pop--up mode in which
the terrain display is automatically displayed when the EGPWS system
detects a terrain alert situation.
The pilot can remove the ground display from the radar indicator, or
prevent the EGPWS system from displaying ground on the radar
indicator by pushing the INHIB button.
The ↑ and ↓ range buttons on the radar indicator control the range of
the ground display. The radar indicator AZ button is active, and can
display or remove azimuth buttons. The other radar controls do not
change the ground display, but if they are used while EGPWS is
displayed, they control the radar RTA and the effects of any changes
are seen when the radar image is re--displayed.
For additional information, refer to the appropriate E GPWS operating
manual.