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A34-46-00-038.fm
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

GPWS - SELF-TEST - LEVEL 6
General Description
The GPWC has a level six discrete input test.
The level six self-test can be done from the GPWC or the GPW module. Use a 600 ohm headphone to listen to the test information when you do the test from the GPWC. 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 or the GPW module to get access to level six. The self-test buttons have 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 buttons 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 test levels 2 through 5 end, the aural message PRESS TO CONTINUE shows. Push the self-test button to go to the next test level. When the level one test ends, there is no aural message. If you do not push the self-test button within three seconds, the self-test ends.
Level Six Self-test - Discrete Input Test
A level six test finds changes in discrete inputs.
The test starts with the aural message DISCRETE TEST. If the condition of a discrete input changes, you hear the new state of the discrete.
NOTE:  The landing gear handle must be in the Off position to test the gear inhibit switch on the GPW module.
NOTE:  Before moving the landing gear handle install landing gear locking pins.
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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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

DISCRETE INPUT  INPUT SOURCE  ANNUNCIATIONS 
GEAR INHIBIT SWITCH  GPW MODULE  LANDING GEAR DOWN LANDING GEAR UP 
FLAP INHIBIT SWITCH  GPW MODULE  LANDING FLAPS NOT LANDING FLAPS 
GLIDESLOPE INHIBIT SWITCH  P1-3 AND P3-1  GLIDESLOPE CANCELLED GLIDESLOPE ENABLED 
TERRAIN INHIBIT SWITCH  GPW MODULE  TERRAIN OFF TERRAIN ON 
TERRAIN RELAY 1  LEFT EFIS TERR SWITCH  TERRAIN RELAY 1 ON TERRAIN RELAY 1 OFF 
TERRAIN RELAY 2  RIGHT EFIS TERR SWITCH  TERRAIN RELAY 2 ON TERRAIN RELAY 2 OFF 

LEVEL 6 DISCRETE INPUT TEST
A34-46-00-038.fm
GPWS - SELF-TEST - LEVEL 6

January 2005
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved

A34-46-00-039.fm
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

GPWS - STATUS LEDS
Purpose
There are three status LEDs on the front panel of the ground proximity warning computer (GPWC). The LED indicators show the status of the GPWC when power is supplied. The LEDs turn on for these conditions:
-External fault - yellow
-Computer OK - green
-Computer fail - red.

The yellow external fault LED shows that the GPWC has detected an external interface fault. The green computer OK LED shows that the GPWC is operating with no internal faults. The red computer fail LED shows that the GPWC has an internal fault.
NOTE:  VISIT THE HONEYWELL EGPWS WEBSITE www.egpws.com FOR ACCESS TO ADDTIONAL INFORMATION AND FREE PDF DOCUMENTS
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

FAULT EXTERNAL  OK COMPUTER  FAIL COMPUTER  ACTIONS 
OFF  GREEN  OFF  NORMAL OPERATION 
　
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