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on the multifunction display (MFD) in a MAP mode. The AHRS provides stabilization input to the RTA.
In the weather detection mode, storm intensity levels are displayed in four bright colors, contrasted against a deep black
background. Areas of very heavy rainfall are displayed in magenta, heavy rainfall in red, less severe rainfall in amber, moderate
rainfall in green, and little or no rainfall in black (background). Areas of detected turbulence are displayed in magenta.
Range marks and identifying numerics, displayed in contrasting colors, are used to evaluate the location of storm cells relative
to the aircraft.
The ground mapping (GMAP) function is used to improve resolution and identification of small ground targets at short
ranges. The reflected signals from ground surfaces are displayed as green, yellow, red, or magenta (most to least reflective).
COMPONENTS AND OPERATION
WEATHER RADAR OPERATIONAL MODES
The basic weather radar operational modes can be categorized as follows:
RADAR CONTROL MENU
Weather radar functions are controlled on the radar menu. The radar menu can be displayed on the PFD by pressing the
RADAR button on the display control panel. Selection of the radar display is accomplished by pressing the TR/WX button
on the display control panel. Range and tilt are controlled by the respective knobs on the display control panel.
STBY MODE
STBY is the first mode selection in the RADAR CONTROL menu. The antenna is stowed in tilt-up position and is neither
transmitting nor scanning, although power is still applied to the system. The radar is in this mode, after the system power
up, or after the mode is selected by the pilot. This mode is automatically selected 60 seconds after the transition to ground
has been performed.
WX MODE
WX is the second mode selection in the RADAR CONTROL menu. This mode is a four-color weather display representing
four different precipitation rates.
WX-T MODE (WITH TURB RTA INSTALLED)
WX-T mode is the third selection in the RADAR CONTROL menu. This is a four-color weather display mode plus turbulence
mode.
TURB MODE (WITH TURB RTA INSTALLED)
TURB is the fourth mode selection in the RADAR CONTROL menu. This turbulence only mode allows turbulence to be
separated from heavy rainfall. After 30 seconds it reverts back to the previous selection.
MAP MODE
MAP mode is the fifth selection in the RADAR CONTROL menu. This mode is typically used for detection and display
of prominent and familiar ground features as an aid to navigation.
LIGHTNING DETECTION SYSTEM (OPTIONAL)
The optional lightning detection system maps the location of thunderstorm activity 360° around the airplane to a distance
of 200 nautical miles. Lightning symbology is displayed as lightning bolt icons. The lightning icons are color coded to identify
different levels of lightning intensity. Light levels of thunderstorm cells (1-4 strikes) are yellow, medium level cells 5-
9 strikes) are red, and heavy level cells (over 9 strikes) are magenta.
NAVIGATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
17-01-32 CSP 100-6 REV 1
WEATHER RADAR (Cont)
TEST MODE
The test mode is the sixth selection in the RADAR CONTROL menu. In this mode, a simulated target return is used to
create a rainbow like pattern of colors on the display. While the radar is in this mode, the transmitter is turned OFF.
TARGET ALERT
The target mode message TGT changes from cyan to yellow to indicate a target alert.
A target alert is issued if either channel (pilot or copilot side) of the weather radar reports a target. The TGT message flashes
for 5 seconds, then remains steady as long as the radar detect a target.
SECTOR SCAN MODE
This is a reduced antenna azimuth scan mode, which restricts mechanical scan angle used and processed by the RTA.
This mode can be used with any other scanning mode of operation and is used to increase the radar update rate.
While in this mode, antenna scan range is maximum ± -30° from the aircraft heading line. If either command channel is in
target mode, sector scan is disabled.
GROUND CLUTTER SUPPRESSION GCS MODE
This feature is selected, those radar returns that appear as ground clutter are suppressed. This feature eases the interpretation
of rainfall when viewed from higher altitudes by eliminating much of the display caused by ground returns.
AUTOTILT MODE
Autotilt automatically adjusts the antenna tilt angle to attempt to keep the radar scanning approximately the same region of
space when the aircraft climbs and descends.
Autotilt is designed to reduce the number of times the aircrew needs to adjust the TILT control whenever the aircraft altitude
or radar range setting changes.
Autotilt may be selected on or off when the RADAR menu is active, or anytime the radar tilt value show on the on-side
　
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