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♦page 6-32).
Figure 4-31 Weather Plus Turbulence Mode At 40 NM Range
Figure 4-32 depicts the same turbulence that is displayed in figure 4-31,
but this time on the 80 NM range scale. Remember, turbulence will
only be displayed out to 40 NM.
1st Edition, 1st Revision
4-30 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
WARNING
Because the radar determines turbulent areas by measuring
precipitation velocity, it can only function in the presence of
precipitation. Consequently, the system is not capable of detecting
clear-air turbulence.
Figure 4-32 Weather Plus Turbulence Mode At 80 NM Range
TURB (TURBULENCE MODE) — AIRBUS ONLY


CAUTION
Precipitation will not show when operating in TURB mode.
Inadvertent penetration of areas of severe weather is possible.
TURB (Turbulence Only) Mode displays only turbulence information
without weather (figure 4-34). During automatic operation, ground
clutter will also be removed. Turbulence is displayed out to 40 nautical
miles for all selected ranges.
1st Edition, 1st Revision
18 Sep 03 4-31
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-33 Airbus TURB Control
Figure 4-34 TURB (Turbulence Only) Mode Display
1st Edition, 1st Revision
4-32 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
MAP
When operating in automatic, MAP mode enables display of all radar
echoes including terrain and weather information (figure 4-37). The
receiver sensitivity is decreased by approximately 10 dB (one color
level) to accommodate terrain characteristics instead of weather. This
mode enables identification of terrain features such as mountains,
coastlines, bodies of water etc. No turbulence information is displayed.
PAC Alert (♦page 4-39) is not active in MAP mode.
Figure 4-35 Airbus MAP Control
1st Edition, 1st Revision
18 Sep 03 4-33
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-36 Boeing MAP Control
Figure 4-37 shows that Lake Michigan, Chicago and the immediate
vicinity are clearly displayed when MAP mode is selected. The radar is
in automatic mode.
Figure 4-37 Map Mode Typical Display
1st Edition, 1st Revision
4-34 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
N NOTE
Below 10,000 feet, manual operation of the radar will be required for
adequate ground mapping due to the position of the beams (♦page
4-23). When operating the radar manually, careful tilt selection is
required in order to properly identify ground targets. Tilt should be
varied until an optimum return is displayed.
GAIN PLUS™ (AVAILABLE DURING AUTOMATIC
OPERATION)
During automatic operation the WXR-2100 MultiScan radar provides
Gain PLUS, which includes:
• Conventional increase and decrease of receiver sensitivity
• Variable Temperature Based Gain
• PACAlert
• OverFlight Protection
• Oceanic Weather Reflectivity Compensation™
CONVENTIONAL INCREASE AND DECREASE OF RECEIVER
SENSITIVITY
In general, weather radar measures the reflectivity of water content in
the atmosphere. When the CAL (calibrated) gain position is selected:
• Black represents zero to minimal reflectivity.
• Green represents light reflectivity.
• Yellow represents moderate reflectivity.
• Red represents heavy to extreme reflectivity.
• Magenta indicates turbulence.
N NOTE
A more in depth discussion of reflectivity and gain can be found in
the chapters AVIATION WEATHER and HOW RADAR WORKS.
The CAL (calibrated) gain setting yields the most accurate correlation
of color levels (black, green, yellow and red) with actual rainfall rates
and their corresponding thunderstorm threat levels. CAL gain is the
recommended gain position for normal operation. Figure 4-38 shows a
radar display with gain set to CAL.
1st Edition, 1st Revision
18 Sep 03 4-35
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-38 GAIN Set to CAL
During automatic operation rotating the gain knob clockwise increases
receiver sensitivity. MAX gain (figure 4-39) is selected when the gain
knob is rotated fully clockwise and represents an approximately one
and a half color level increase in the color of the displayed weather
(♦page 6-4). Consequently, if weather is present, green or yellow
returns may appear in areas that were originally black, green returns
　
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