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changes from dots to a solid yellow color. If GPWS detects a
terrain warning alert, the threat terrain changes from dots to a
solid red color.
On final approach, terrain near the runway does not show.
GPWS System Messages
These GPWS system messages show in cyan on the left side of
the ND:
* TERR shows when terrain data displays
* TERR TEST show when the GPWS is in self-test mode.
GPWS Alert Messages
These GPWS alert messages show on the right side of the ND:
* TERRAIN (red) shows when a terrain awareness warning
occurs
* TERRAIN (amber) shows when a terrain awareness caution
occurs.
GPWS - TERRAIN AWARENESS DISPLAY
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GPWS Non-Normal Messages
These messages show on the navigation display (ND) for GPWS
non-normal conditions:
* System alert messages
* Range disagree messages.
GPWS System Alert Messages
These messages show in amber on the left side of the ND:
* TERR POS shows when airplane position data is not valid
* TERR INHIBIT shows when you push the terrain override
switch on the GPW module
* TERR FAIL shows when the TCF or TA functions have failed.
NOTE: The TERR FAIL message shows in all display modes.
Terrain data does not show on either ND if there is a system
alert message.
Range Disagree Messages
These alert messages show in amber on the ND when there is a
range disagree fault:
* TERR RANGE DISAGREE shows when the GPWS range
disagrees with the range selected on the on-side EFIS
control panel
* MAP/TERR RANGE DISAGREE shows when the GPWS
range, the on-side EFIS range, and the FMC range disagree.
Terrain data does not show on the ND if there is a range
disagree message.
GPWS - NON-NORMAL TERRAIN DISPLAYS
EFFECTIVITY
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General
The ground proximity warning system (GPWS) has six levels of
self-test. Each level provides different information about the
GPWS. These are the six levels of self-test:
* GO/NO-GO operational test
* Current faults
* System configuration
* Fault history
* Alert/warning history
* Discrete input test.
Level one is the GO/NO-GO operational test. A level one test
provides visual and aural annunciations on the flight deck.
Level One Test Preparation
These conditions must be true to do a level one test of the
GPWS:
* Airplane on ground
* GPWS power on
* EFIS ND mode selector in correct mode (expanded APP,
VOR, MAP, and centered MAP)
* TERR switch on EFIS control panel (CP) selected
* All interfacing systems installed and energized.
Level One Test Procedure
Use the test switch on the ground proximity warning module to
begin a level one test. A level one test first does a test of these
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