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in detecting dangerous thunderstorms along
the flight path. It also clarifies the boundaries
and intensities of storm cells and locations
of severe precipitation. The GWX 68 has
both horizontal and vertical scan capability,
which provides greater detail on the position
of storms, including their heights. The
ground-mapping feature of the onboard radar
assists the pilot in identifying landmarks
and bodies of water.
The GWX 68 radar unit is in the nose of the
aircraft. The antenna sweeps across an arc of
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90° horizontally (45° each side of center), and
60° vertically (30° above and below the horizon).
The radar transmits a very-high-energy
radio beam, which is reflected from precipitation
and surface features.
The radar beam is dangerous, and
close exposure can cause severe injury.
When operating the radar on
the ground, ensure that no persons or
objects are within 11 feet of the antenna.
(People inside the aircraft are
safe, if no object is close enough to
the antenna to reflect the entire beam
into the aircraft.) Do not begin to
transmit, until the aircraft is clear
of all persons and objects on the
ground within 11 feet.
WEATHER RADAR PAGE AND
CONTROLS
On the MFD, the MAP–WEATHER RADAR
page provides access to the weather radar depiction
and control.
On the ground, the weather radar must be activated
to operate. Pressing the MODE softkey
c a u s e s o t h e r s o f t key s t o a p p e a r,
providing control of the radar. The
STANDBY key initiates the 1-minute warmup
period required before operating the radar.
After 1 minute, ensure the aircraft is clear of
all persons and objects within 11 feet of the
antenna and forward of the aircraft, then select
the WEATHER softkey, which activates
the weather radar antenna.
NOTE
If the aircraft is already airborne,
the STANDBY mode is not required
before energizing the antenna. After
landing, the radar automatically returns
to STANDBY mode.
Pressing the BACK key exits the MODE softkey
menu, and returns to the main radar softkey
menu.
RADAR DISPLAY AND
INDICATIONS
The GWX 68 digital radar utilizes a four-color
display capable of scanning airspace ahead of
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.
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