K61028
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A
747-400
MAINTENANCE MANUAL

GLIDESLOPE BEAM CENTER "BANK ANGLESOFT BANK ANGLE""GLIDESLOPE"
HARD "GLIDESLOPE"
RUNWAY
SOFT ALERT AREA
HARD ALERT AREA

MODE 5
EXCESSIVE GLIDESLOPE DEVIATION

MODE 6
THESE ARE THE
BANK ANGLE
AVAILABLE ALTITUDE CALLOUT OPTIONS FOR MODE 6
2500 FEETTWENTY FIVE HUNDRED (OR) RADIO ALTIMETER 1000 FEET ONE THOUSAND DECISION HEIGHT PLUS 100 FEET PLUS HUNDRED (OR) APPROACHING DECISION HEIGHT DECISION HEIGHT PLUS 80 FEET APPROACHING MINIMUMS DECISION HEIGHT PLUS 50 FEET FIFTY ABOVE DECISION HEIGHT MINIMUMS, MINIMUMS (OR) MINIMUMS (OR) MINIMUM
(OR) DECIDE (OR) DECISION HEIGHT 500 FEET FIVE HUNDRED (OR) 2 SECOND 960 Hz TONE 400 FEET FOUR HUNDRED 300 FEET THREE HUNDRED 200 FEET TWO HUNDRED
ALTITUDE
100 FEET ONE HUNDRED (OR) 2 SECOND 700 Hz TONE 80 FEET EIGHTY 60 FEET SIXTY 50 FEET FIFTY 40 FEET FORTY 35 FEET THIRTY FIVE (OR) 1 SECOND
1400 Hz TONE 30 FEET THIRTY 20 FEET TWENTY (OR) 1/2 SECOND
2800 Hz TONE 10 FEET TEN 5 FEET FIVE
MODE 6 ALTITUDE CALLOUTS

Ground Proximity Warning System Modes
Figure 2 (Sheet 3)

K61203
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747-400 MAINTENANCE MANUAL
MICROBURST
"WINDSHEAR WINDSHEAR WINDSHEAR"
RUNWAY
MODE 7
WINDSHEAR DETECTION

"TOO LOW TERRAIN" 
700 
400  AGL 
AGL 
RUNWAY 
1 
4  1  5 
N  2  N 
M  N  M 
M 

0 4  1215
DISTANCE TO SELECTED RUNWAY (NM) TERRAIN CLEARANCE FLOOR
LOOK-AHEAD DISTANCE 1:FUNCTION OF AIRCRAFT GROUND SPEED
1/2 TERRAIN FLOOR HEIGHT CLEARANCE 
ALERT AREA PROJECTED UPWARD 6 DEGREES 
1/2 TERRAIN FLOOR HEIGHT CLEARANCE  LOOK-AHEAD DISTANCE 2 =1/2 LOOK-AHEAD DISTANCE 1  ALERT AREAS PROJECTED ALONG AIRCRAFT FLIGHT PATH 

TERRAIN AWARENESS ALERTING AND DISPLAY
(TERRAIN AWARENESS CAUTION AND WARNING ENVELOPES)

Ground Proximity Warning System Modes
Figure 2 (Sheet 4)

K61215
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747-400
MAINTENANCE MANUAL

 b)  The TOO LOW FLAP caution is inhibited when the GND PROX FLAP OVRD switch is pressed. This will simulate the flaps in a landing position if the pilot prefers to land with less than normal landing flaps.
 (b)  Mode 4C provides alerts for insufficient terrain clearance during takeoff or go-around maneuvers. Mode 4C alerts are based on radio altitude and a minimum terrain clearance, or floor, that increases with radio altitude. Floor value can equal up to 75 percent of the maximum radio altitude achieved since takeoff or go-around. If radio altitude decreases below this floor, the aural TOO LOW, TERRAIN message is heard and the amber GND PROX light comes on.
 (5)  
Mode 5 Function (Fig. 2)

 (a)  
Mode 5 provides caution alerts for excessive deviation from the glideslope beam during an ILS approach.

 If the airplane deviates excessively below an ILS glideslope, when the gear lever is down and the flaps are in landing configuration, the aural GLIDESLOPE caution message is heard and the amber GND PROX light comes on. At first the GLIDESLOPE message is heard at half the volume of the other EGPWS alerts. This is called a soft alert. If the glideslope deviation increases, or if the radio altitude decreases, the GLIDESLOPE message is heard more frequently. If the glideslope deviation remains excessive, the aural GLIDESLOPE message is heard at full volume. This is called a hard alert.
　
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