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WX . Selects the WX mode of operation. When WX is selected, airplane inflight, the system is fully operational and all parameters are set for enroute weather detection. If the rotary knob is moved directly from OFF to WX, the system will first go into SBY for approximately 45 seconds, then become active.

Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005

RCT . Enables the Rain Attenuation Compensation Technique (REACT). The REACT compensates for attenuation of the radar signal as it passes through rainfall. Strong targets (high attenuation levels) cause the receiver to reach its maximum gain value in a short time/short range. Weak targets (low attenuation levels) cause the receiver to reach its maximum gain in a longer time/longer range. When this maximum gain value is reached, a cyan background field will appear. Any target inside of the cyan area will appear in magenta colour, indicating maximum severity.

GMAP . Selects the ground mapping mode. The auto TILT control is turned down until the desired amount of terrain is displayed. The colour scheme is changed to cyan (least reflective return), yellow (moderate return) and magenta (strong return).

FP . Selects the flight plan mode. This clears the screen of radar data so ancillary data can be displayed, such as navigation displays and lightning data. In the FP mode the radar RTA is put to standby and the FPLN legend is displayed in the mode field.

Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2

TST . Selects the test mode. The test position selects a special test pattern, to verify system operation. When the TEST is complete, the radar enters the FSBY mode.

Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005

TILT
The TILT rotary knob is used to manually select the tilt angle of the antenna. Clockwise rotation of the knob tilts the antenna upward to +15° and counter-clockwise rotation of knob tilts antenna downward to .15°. When the TILT knob is pulled out (auto-tilt), the antenna tilt is automatically adjusted with regard to selected range and barometric altitude. The tilt control can fine tune the tilt setting by ± 2°. When in auto-tilt, an A symbol will appear following the digital tilt readout.

ELEVATION IN FEET
80,000 70,000 60,000 50,000
30,000 20,000 10,000 0

0 25 50 100
RANGE NAUTICAL MILES

010 20 30 40 50 60 70
80
RANGE NAUTICAL MILES
GF1710_048a
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2

TILT MANAGEMENT
The pilot can use tilt management techniques to minimize ground clutter when viewing weather targets.
Assume the aircraft is flying over relatively smooth terrain that is equivalent to sea level in altitude. The pilot must make adjustments for the effects of mountainous terrain.
The following figure helps to visualize the relationship between tilt angle, flight altitude, and selected range. It shows:
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