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If the aircraft penetrates the Caution envelope boundary, the aural message
“CAUTION TERRAIN” or “CAUTION OBSTACLE” is generated, and the amber
“GND PROX” lights flash. Simultaneously, terrain/obstacle areas which conflict with
the caution criteria are shown in solid yellow color on the Terrain Awareness Display.
The caution alert is typically given 60 seconds ahead of a terrain/obstacle conflict.
Terrain/Obstacle Awareness Caution Alert
Figure 17-34
P604_17_081
LX/TERRAIN G+1 USTB T+10.7
TAS 217 217
CFEJP
ALLIX
MAFMU
KDEN
1NM
7NM
177NM
2NM
0:03
:
0:01
0 31
:
:
:
:
TOD
DIRECT
ALLIX
ABOVE
BELOW DME2
– – – –
T-4.5
UTC00:40 GS SAT-11C TAT -5C
VOR1 ADF2
5
10
164
0:00/ 610NM
2.8
KASE
10200
13100A
MAFMU
CFEJP
/10210A
ALLIX
TOD
0:01/ 612NM
12000
1100
PULL UP
GND PROX
“CAUTION,
TERRAIN”
NAVIGATION SYSTEMS
For Training Purposes Only
Sept 04
17-47
P I LOT T R A I N I N G GU I D E
Terrain/Obstacle Awareness Warning Alert
If the aircraft penetrates the Warning envelope boundary, the aural message
“TERRAIN TERRAIN, PULL UP” or “OBSTACLE, OBSTACLE, PULL UP” is
generated, and the red “PULL UP” lights flash. Simultaneously, terrain/obstacle areas
which conflict with the warning criteria are shown in solid red color on the Terrain
Awareness Display.
The warning alert is typically given 30 seconds ahead of a terrain/obstacle conflict.
Terrain/Obstacle Awareness Warning Alert
Figure 17-35
EGPWS Glareshield Switch/Lights
Terrain Inhibit (TERR INHB) Switch/Lights
A GPWS TERR INHB switch/light is installed above each “PULL UP / GND PROX”
switch/light on the glareshield. These switch/lights are used by the flight crew to
manually inhibit the Terrain Awareness Alerting and Display and the Terrain
Clearance Floor functions when required. Pressing either TERR INHIB switch/light
will inhibit these functions. A second push of either switch/light will reactivate these
functions. Note that when the Terrain Inhibit is selected, the basic GPWS and
windshear detection functions remain operational.
If the terrain is selected for display while the Terrain functions have been inhibited by
the crew, a cyan “TERRAIN INHIBITED” message replaces the “TERRAIN”
message in the top left corner of the MFD and both switch/lights illuminate white.
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