*
Internal faults for flight X
*
External faults for flight X
*
Go to next oldest flight leg and repeat.
A short cancel causes the test to go immediately to the next flight leg. A long cancel ends self test level four.
Level Five Self Test -Warning History
Level five self test annunciates GPWS alerts over the last ten flights.
A level five test begins with the aural message WARNING HISTORY. If there are no alerts in the flight history memory, you hear the aural message NO WARNINGS. If there are alerts in the flight history memory, you hear the most recent alerts first. You hear the alerts in this order:
*
FLIGHT X (X is the most recent flight leg number)
*
GPWS alerts for flight X
*
Go to next oldest flight leg and repeat.
A short cancel cause the test to go immediately to the next flight leg. A long cancel ends self test level four.
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777 AIRCRAFT MAINTENANCE MANUAL
GPWS -SELF TEST -LEVELS 2-5
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GPWS -SELF TEST -LEVEL 6
General Description
The ground proximity warning computer (GPWC) has a level six discrete input test.
This test accesses test information not available from the maintenance access terminal (MAT). Use a 600 ohm headphone to listen to the test information. Plug the headphone into the jack on the front panel of the GPWC.
Use the self test button on the front panel of the GPWC to access level six. The self test button has these two modes:
*
Short cancel -push the button for less than two seconds
*
Long cancel -push the button for more than two seconds.
Use the self test button for these functions:
*
Start self test level one
*
Go to the next item or flight leg within a test
*
Go to the next self test level
*
End the self test.
When a test level ends, the aural message PRESS TO CONTINUE annunciates. Push the self test button to go to the next test level. If you do not push the self test button within three seconds, self test ends.
Level Six Self Test -Discrete Input Test
A level six test checks changes in discrete inputs.
The test starts with the aural message DISCRETE TEST. If the state of a discrete input changes, you hear the new state of the discrete.
You hear the aural message DISCRETE INPUT TEST -PRESS TO CANCEL every 60 seconds. Push a short or long cancel to end the self test.
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GPWS -SELF TEST -LEVEL 6
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GPWS -STATUS LEDS
Purpose
There are three status LEDs on the front panel of the ground proximity warning computer (GPWC). The LEDs come on when there is power to the GPWC. These LEDs are:
*
External fault -yellow
*
Computer OK -green
*
Computer fail -red.
Training Information Point
The maintenance manual and the fault isolation manual do not have a task for the line maintenance technician to use the status LEDs to do a test of the GPWC. Use the maintenance access terminal for a level one test of the ground proximity warning system. Use the self test switch and headphones to do tests of levels two through six.
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For that reason, these LRUs have front panel test features.
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