(2)  
Mode 2 - Large Terrain Closure Rate

 (3)  
Mode 3 - Too Much Altitude Loss During Climbout (at Takeoff or in Go-Around) When Not In Landing Configuration

 (4)  
Mode 4 - Not Enough Terrain Clearance

 (5)  
Mode 5 - Too Much Deviation Below The Glide Slope Centerline

 (6)  
Mode 6 - Aural Callouts When Descending Through Selected Radio Altitudes

 (7)  
Mode 7 - Windshear Detection

 (8)  
Terrain Clearance Floor (TCF) - Not Enough Terrain Clearance (additional to Mode 4)

 (9)  
Terrain Awareness Alerting and Display (TAAD) - Aircraft Fight Path and Terrain Difference (displays terrain and provides alerts for terrain threats ahead of the aircraft).

 B.  The system consists of: 1 - Enhanced Ground Proximity Warning Computer (EGPWC) 1 - Ground Proximity - Glideslope (G/S) Inhibit Light/Switch 1 - Gear Override Switch 1 - Flap Override Switch 1 - Terrain Override Switch 2 - Terrain Display Select Switches 2 - Navigation Displays and associated range, mode, and brightness
 controls 2 - Primary Flight Displays for WINDSHEAR and PULL UP indications
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A
747-400
MAINTENANCE MANUAL

GROUND PROXIMITY
WARNING COMPUTER

Ground Proximity Warning System - Component Location

Figure 1 (Sheet 1)

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K60656
A
747-400
MAINTENANCE MANUAL

FIRST OFFICER'S
CAPTAIN'S AURAL  AURAL WARNING SPEAKER
WARNING SPEAKER PILOTS' LIGHTSHIELD
PILOTS' CENTER
INSTRUMENT PANEL SEE D

SEE C
CAPTAIN'S FIRST OFFICER'S
INSTRUMENT PANEL
INSTRUMENT PANEL SEE B
SEEB E
FORWARD ELECTRONICS CONTROL PANEL
SEE C
FLIGHT COMPARTMENT
GND PROX SYS GND PROX SYS
WINDSHEAR REAC >WINDSHEAR SYS 1
TERR SYS WINDSHEAR SYS
2
>ALT CALLOUTS
10

10
TERR POS
10 10
MAIN EICAS AUXILARY EICAS WINDSHEAR DISPLAY DISPLAY GPWS EICAS MESSAGES
128 MWDG
120
WINDSHEAR AND
C
PULL UP INDICATIONS ON PFD'S
PRIMARY FLIGHT DISPLAY B
GROUND PROXIMITY WARNING MODULE E
CAPTAIN'S AND FIRST OFFICER'S MASTER WARNING AND CAUTION LIGHT 1 AIRPLANES WITH IDS SOFTWARE -015 OR PW-016 2 AIRPLANES WITH IDS SOFTWARE GE-016,
D
RR-016, PW-017 AND SUBSEQUENT
Ground Proximity Warning System - Component Location Figure 1 (Sheet 2)
K60782
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747-400 MAINTENANCE MANUAL
MINS  BARO
FPV  MTRS
RADIO BARO IN HPA RST STD VOR MAP 80
160
40
APP PLN
VOR L 20 320 VOR R
OFF CTR 10 TFC 640 OFF
ADF L 5 ADF R

WXR STA WPT ARPT DATA POS TERR
TERRAIN DISPLAY
SELECT SWITCH
EFIS CONTROL PANEL WITH A TERRAIN DISPLAY SELECT SWITCH
(EXAMPLE)
GS315 TAS312
VOR L 116.80
HDG 131 MAG
190`/15
DME 82.5
TERRAIN
20
GPWS ALERT MESSAGES: -TERRAIN (RED) -TERRAIN (AMBER)
TERR 
OVRD 
AMBER  TERR 
FAIL 
TERR 
POS 
CYAN  TEST TERR  TERRAIN CAUTION ALERT 
TERR  - SOLID YELLOW 
TERRAIN WARNING ALERT 
- SOLID RED 
ND EGPWS TERRAIN DISPLAY 
(EXAMPLE) 

Ground Proximity Warning System - Component Location
　
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