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the aircraft through various pilot adjustable angles.
Specific sectors may be monitored through
a horizontal plane of 20°, 40°, 60°, or 90°. A vertical
scanning function provides for scanning
through 8° of coverage, selectable by the pilot
to assist in analyzing storm tops, gradients, and
cell buildup activity at various altitudes.
The following additional features provide an
added margin of safety:
• Extended sensitivity time control
(STC)—Logic that automatically correlates
distance of the return echo with
intensity, so that cells do not suddenly
appear to get larger, as they get closer.
• WATCH (weather attenuated color highlight)—
Helps identify possible “shadowing”
effects of short-range cell activity.
Radar return signals are weakened, or attenuated,
by intense precipitation. The
same is true for extensive areas of lesser
precipitation. Under these circumstances,
the potential exists for “the storm behind
the storm” to be masked from viewing
with airborne radar units.
• Weather alert looks ahead for intense cell
activity in the 80–320 NM range, even if
these ranges are not being monitored.
Refer to Table 16-10.
Range Adjustment
The range of the radar display is adjustable.
Rotate the RANGE/PAN joystick knob to adjust
the display range. The current distance to each
dotted arc is noted at one end of each arc. Range
adjustment only affects the display; it does not
change the beam intensity or sensitivity (gain)
of the radar.
WARNING
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WATCH Softkey
The GWX 68 radar includes a WATCH (weatherattenuated
color highlight), which projects a
colored “shadow” to indicate a warning to the
pilot of possible attenuation. The WATCH softkey
selects or deselects this feature.
Gain Control
Radar sensitivity may be adjusted by pressing
the GAIN softkey, then rotating the small FMS
knob to adjust the radar gain. This could
change the color indications and give a false
indication of actual precipitation and surface
returns. However, adjusting radar-return gain
may increase clarity of some situations.
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
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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
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