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When finished viewing at an adjusted
gain, press the GAIN softkey again to
turn off the gain adjustment, and return
the radar to calibrated-gain mode,
so that colors are again accurately indicating
the strength of the returns.
ANTENNA STABILIZATION
The GWX 68 radar antenna is stabilized
through gyro data to minimize low quality images
as the pilot maneuvers around weather,
particularly in turbulence. Through control
key inputs, the STAB feature may be selected
ON or OFF as desired.
ANTENNA TILT
Adjusting the vertical tilt angle of the antenna
selects the vertical direction to scan. This enables
the pilot to focus attention on a particular
area, such as the tops of a storm, or the
ground. To adjust the antenna tilt from the
MAP–WEATHER RADAR page, press the FMS
knob, and a cursor/highlight appears in the TILT
field of the display. Adjust the antenna (radar
beam) tilt as desired, using the small FMS knob.
If the VERTICAL display is presented, a line appears
indicating the angle of tilt.
GROUND MAPPING
Ground mapping mode highlights surface features.
Cities and other built-up areas typically
provide strong returns, while water typically
provides little or no return. Ground mapping
may assist the pilot in navigation.
To select ground mapping from the MAP
–WEATHER RADAR page, press the MODE
softkey. Press the GROUND softkey. Adjust antenna
tilt to select the specific angle desired for
ground mapping. Refer to Table 16-11.
TERRAIN AWARENESS
AND WARNING SYSTEM
An integral terrain awareness and warning
system (TAWS) provides the pilot with aural
and visual warnings of terrain and obstacles
near, at or above the aircraft altitude or flight
CAUTION
16-50 510OM-00
CITATION MUSTANG OPERATING MANUAL
GROUND MAP
MODE COLOR
INTENSITY
0 DB
> 0 DB TO < 9 DB
9 DB TO < 18 DB
18 DB TO < 27 DB
27 DB AND GREATER
BLACK
CYAN
BLUE
MAGENTA
YELLOW
Table 16-11. GROUND TARGET RETURN
INTENSITY LEVELS
WEATHER MODE
COLOR
APPROXIMATE
RAINFALL RATE
INTENSITY
< 23 DBZ < .01 IN./HR.
.01 - 0.1 IN./HR.
0.1 - 0.5 IN./HR.
0.5 - 2 IN./HR.
> 2 IN./HR.
23 DBZ TO < 32 DBZ
32 DBZ TO < 41 DBZ
41 DBZ TO < 50 DBZ
50 DBZ AND GREATER
BLACK
GREEN
MAGENTA
RED
YELLOW
Table 16-10. PRECIPITATION
INTENSITIES
path (Figure 16-46). TAWS relies on current
terrain and obstacle databases.
HAZARD DEPICTIONS AND
ALERTS
Red areas on the terrain map indicate terrain
within 100 feet (approximately 33 meters) of
the current aircraft altitude or higher, including
terrain above the current aircraft altitude
(Figure 16-47). Amber areas on the terrain
map indicate terrain between 100 feet and
1,000 feet below the aircraft altitude. Black
areas on the map indicate terrain greater than
1,000 feet below the aircraft.
Obstacles are similarly colored, and depicted
with standard obstacle symbols. If TAWS detects
an imminent impact (based on aircraft
course, ground speed, and vertical speed), an
X is depicted in the current aircraft course at
the point of expected impact.
Color-coded warnings (for red areas) and cautions
(for amber areas) are signaled through
warning flags appearing on the PFD, and
through aural warnings. If any page, except the
TERRAIN PROXIMITY page is selected on
the MFD, a pop-up warning message appears
in the lower right corner of the display. In this
situation, pressing the ENT (enter) key immediately
switches the MFD to the MAP–TERRAIN
PROXIMITY page; pressing the CLR
(clear) key causes the current map to remain
visible on the MFD.
TAWS hazard depictions may also be displayed
as overlays on other maps by selecting
the TERRAIN softkey. However, TAWS hazard
depictions cannot be displayed simultaneously
with XM Weather NEXRAD images or
airborne weather radar indications, because
they use similar color coding to indicate
weather threat areas.
XM WEATHER AND GDL 69/69A
DATA LINK
The MFD can display satellite-broadcast
weather information. From any location in
North America, the MFD can receive aviation
weather information from the XM Weather™
satellite broadcasts. The XM Weather service
also provides temporary flight restriction
(TFR) reports. The system can download XM
Weather data from satellite broadcasts, which
is received from a commercial subscription
　
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