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The weather radar operating modes, gain and antenna tilt functions are all controlled by the two radar control panels. Both the pilot and copilot can look at different ranges and tilt settings at the same time on their respective MFDs.
The weather radar modes and features are as follows:
TRB . Momentarily pressing the TRB button enables the turbulence mode. When this mode is selected, the radar determines if turbulence is present. TRB can only be engaged in the WX mode and in selected ranges of 50 NM or less. The weather/turbulence WX/T mode is annunciated in the status display. Areas of at least moderate turbulence are shown in white.
STAB . Momentarily pressing the STAB button, holds the elevation of the antenna beam constant at all azimuths, regardless of airplane bank or pitch maneuvers and relative to the earth’s surface. The stabilization system uses IRS as a reference. Momentarily pressing the STAB button disables antenna stabilization and STAB is annunciated in the status display.
WX SAT .56
4000 4000
ANNUNCIATION
T5.0
G85% TAT .40
STAB TAS 234
GSPD 345
GF1710_036
Volume 2 Flight Crew Operating Manual
Rev 2A, Apr 11, 2005
TGT . Target alert monitors for red or magenta weather conditions (rainfall rate) beyond the selected range and 7.5° on each side of the airplane heading and is selectable in all but the 300 NM range. If such weather is detected, outside the selected range the TGT alert annunciation changes from green armed to an amber alert condition on the MFD WX Status display. When this warning is received, the pilot should select longer ranges to view target alert. When TGT button is selected, TGT annunciation will replace the GAIN annunciation in the status display.
SECT . The normal radar sweep is ± 60° from the airplane nose at a rate of 14 sweeps/min. Pressing SECT button reduces the angle of sweep to ± 30° at a rate of 28 sweeps/min. Pressing the SECT button again, returns to normal sweep. Both the pilot’s and copilot’s displays will show the same sweep angle.
120° arc 60° arc
GAIN . The GAIN knob is a rotary control and push/pull switch that is used to control the receiver gain. Push on the GAIN switch to enable the preset calibrated gain mode. Calibrated gain is the normal mode and is used for weather avoidance. Pull out on the GAIN switch to enable the variable gain mode. Variable gain is used to provide additional weather analysis and for ground mapping. In WX mode, variable gain receiver sensitivity can be increased to show weak targets or can be reduced to eliminate weak returns.
ANNUNCIATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
WX SYSTEM OPERATION
The RADAR rotary knob is used to select the following functions:
OFF . Turns the radar off. The system is no longer radiating and the antenna is stowed.
SBY . Selects the WX system in standby mode. It takes approximately 45 seconds for the system to warm up after being switched out of OFF. There is also a hidden mode, Forced Standby (FSBY). This mode is enabled automatically on the ground, if the airplane is powered up, with the radar powered. To exit FSBY, push STAB button 4 times within 3 seconds. This mode prevents the radar from radiating, thereby protecting the ground personnel from radiation exposure.
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