GPWS -PFD AND MASTER WARNING LIGHT ANNUNCIATIONS
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GPWS -NON-NORMAL DISPLAYS
GPWS Non-Normal Messages
These messages show on the navigational display (ND) to alert the flight crew of GPWS non-normal conditions:
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System alert messages
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Range disagree messages.
GPWS System Alert Messages
These messages show in amber on the left side of the ND:
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TERR POS shows when the GPWS determines airplane position data is not valid
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TERR OVRD shows when you push the terrain override switch on the landing gear panel
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TERR FAIL shows when a fault occurs in the GPWS.
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:
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TERR RANGE DISAGREE shows when the GPWS range disagrees with the range selected on the on-side EFIS control panel
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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.
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777 AIRCRAFT MAINTENANCE MANUAL
GPWS -NON-NORMAL DISPLAYS
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GPWS -SELF TEST -LEVEL 1
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:
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GO/NO-GO operational test
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Current faults
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System configuration
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Fault history
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Alert/warning history
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Discrete input test.
Level one is a 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 self-test of the GPWS:
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Airplane on ground
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GPWS power on
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EFIS ND mode selector in correct mode (expanded VOR, APP, or MAP or centered MAP)
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TERR switch on EFIS control panel (CP) selected.
Level One Test Procedure
Select operational test from the maintenance access terminal (MAT) to begin a level one test. A level one test first does a test of these configuration conditions:
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Program pin parity
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Airplane configuration database validity
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Airplane type.
If the test finds a configuration fault, the self-test annunciates the fault and the self-test ends. If the GPWS passes the configuration test, the level one test continues.
Training Information Point
You can start a level one self-test from the front panel of the GPWC, but you cannot see the flight deck annunciations. Use the MAT to start an operational test of the GPWS.
Level One Test -Normal Indications
These messages will show at some time for a normal Level one self-test:
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EICAS Advisory -GROUND PROX SYS
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EICAS Advisory -WINDSHEAR SYS
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EICAS Advisory -ALTITUDE CALLOUTS
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EICAS Advisory -TERR POS
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EICAS Status -GROUND PROX SYS
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EICAS Status -WINDSHEAR REAC
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EICAS Status -TERR SYS
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Amber ND alert message -TERR TEST
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Amber ND alert message -TERR FAIL.
These visual and aural annunciations are for a normal level one test:
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GPWS -SELF TEST -LEVEL 1
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ND system message TERR TEST shows in cyan
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Ground proximity warning light on and aural message GLIDESLOPE
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Master warning lights on, PFD message PULL UP (red), and aural message PULL UP
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Master warning lights on, PFD message WINDSHEAR (red), and aural message WINDSHEAR, WINDSHEAR, WINDSHEAR
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Terrain test pattern shows on ND for 12 seconds
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Master warning lights on, PFD message PULL UP (red), TERRAIN alert message (red) on NDs, and aural message TERRAIN, TERRAIN, PULL UP.
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Ground proximity light on and TERRAIN alert message (amber) on NDs
