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 During a level 5 self test, a SHORT CANCEL will start to announce the warnings and cautions for the next flight leg. A LONG CANCEL will stop the level 5 self test and the PRESS TO CONTINUE message will be heard.
 6) Level 6 - Discrete Test
 This level announces changes in discrete inputs. The level 6 self test is started by pressing the self test button when the level 5 PRESS TO CONTINUE message is heard. A DISCRETE INPUT TEST - PRESS TO CANCEL message is heard every 60 seconds during the level 6 self test. Any discrete inputs that change state during the level 6 self test are announced. The level 6 self test is stopped by a SHORT CANCEL or a LONG CANCEL.
 (4) EGPWC Front Panel
 The EGPWC front panel has 3 EGPWS status LEDs, a PRESS TO SELF TEST switch, a PCMCIA interface, an RS-232 test plug, and a 1/4 inch audio jack.
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A 747-400 MAINTENANCE MANUAL
 (a)  EGPWS Front Panel Status LEDs:
 1)  External Fault LED
 The yellow External Fault LED indicates that the EGPWC has detected an external interface fault. The EGPWC should not be removed or replaced when this condition exists unless the red Computer Fail LED is also illuminated. All external faults should be fixed before removing or replacing the EGPWC.
 2)  Computer OK LED
 The green Computer OK LED indicates that the EGPWC is operating correctly with no internal faults. The EGPWC does not need to be removed when this condition exists.
 3)  Computer Fail LED
 The red Computer Fail LED indicates that the EGPWC has an internal fault. The EGPWC should be removed, replaced, and repaired.
 (b)  EGPWS Front Panel PRESS TO SELF TEST Switch
 The PRESS TO SELF TEST switch is used to do the self test from the EGPWC in the electronic equipment compartment. Headphones are needed to hear the self test information.
 (c)  PCMCIA Interface
 The PCMCIA interface is used to load the databases that the EGPWS uses. There are four LEDs next to the PCMCIA interface that show the status of the data transfer. These LEDs are only active when data is loading.
 (d)  RS-232 Test Plug
 The RS-232 test plug can be used to download fault data from the EGPWC to a personal computer.
 (e)  1/4 Inch Audio Jack
 The EGPWC front panel has a headphone jack that can be used for the self test. Standard headphones with a 2-connector 1/4 inch audio plug can be used.

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A
747-400 FAULT ISOLATION/MAINT MANUAL
GROUND PROXIMITY WARNING SYSTEM
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  AMM REFERENCE 
MODULE - GROUND PROXIMITY WARNING, M7990 MODULE - DIODE ASSEMBLY, M4143 COMPUTER - GROUND PROXIMITY WARNING, X85 GND PROX WARN, C1789 CIRCUIT BREAKER - -------- 1 1 1 1  FLT COMPT, P3-4 117AL, MAIN EQUIP CTR, E1-4 117AL, MAIN EQUIP CTR, E1-4 7D9 FLT COMPT, P7  34-46-02 * 34-46-01* 

* SEE WDM EQUIPMENT LIST
Ground Proximity Warning System - Component Index
Figure 101

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K61460
A

747-400 FAULT ISOLATION/MAINT MANUAL
P7 PANEL
P3-4 PANEL
GROUND PROXIMITY WARNING MODULE, M7990
SEE A
FLIGHT COMPARTMENT
GND PROX
G/S  FLAP  GEAR  TERR 
INHIBIT  OVRD  OVRD  OVRD 
GND 
a  OVRD  OVRD  OVRD 
PROX  w  w  w 
aG/S INHB 
w  w  w 
　
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