Honeywell Primus 880 Pilot's Manual page 151

PRIMUS 880 Digital Weather Radar System
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PUSH BUTTON CONTROLS
The following remotely mounted push buttons control the EGPWS
display:
INHIB (Inhibit) Button -- When active, the push on/push off INHIB
D
button prevents terrain data from being displayed on the radar
indicator. When the button is active, the INHIB annunciator lights.
ON (Terrain) Button -- When active, the push on/push off ON button
D
displays terrain on the radar indicator.
ANNUNCIATORS
The following annunciators are displayed on the radar indicator to
indicate EGPWS operation:
FAIL -- The FAIL annunciator indicates that the EGPWS has failed.
D
INHIB -- The INHIB annunciator indicates that the INHIB push
D
button has been pushed and is active. When INHIB is annunciated,
EGPWS is not displayed on the radar indicator, and the aural
annunciators do not sound.
NOTE: The FAIL and INHIB annunciators are often incorporated
into the INHIB push button.
TERR (Terrain) -- The TERR annunciator indicates that the
D
annunciator lamp power is on. It does not indicate the operational
status of the system.
ON -- The ON annunciator indicates that the radar indicator is
D
displaying terrain. This ON push button lamp is lit if the ON push
button has been pushed and is active, or if an actual Terrain Alert
is indicated by the EGPWS system and the terrain is automatically
displayed.
NOTE: The TERR and ON annunciators are often incorporated
into the ON push button.
Some installation may not contain all of these controls and
annunciators, or they may have different names. Most EGPWS
installations have additional controls and/or annunciators (i.e., TEST).
Refer to the appropriate publication for details.
Enhanced Ground- - Proximity Warning System (EGPWS)
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