1. WEATHER RADAR (RDR 1400C) SYSTEM :

2. Purpose of the system:
The Primary use of this radar is to aid pilot in avoiding thunderstorms and associated turbulence.
The RDR1400C color vision weather radar system also has the capability for surface mapping and to receive signals from beacon Transponders.

3. The Primary system components of weather Radar system are
Receiver – Transmitter unit,
Radar Control panel,
Antenna Drive & Antenna Array and
Navigation concentrator.

4. There are two modes of operation :
1. Normal mode of operation (Operation via Radar control panel)
2. Back up mode of operation (Operation via MFD)

13. Function selector: OFF ---- Removes system power.
SBY system is operationally ready, no display (Standby mode).
TST Displays a test pattern without transmitting, identified by ‘TEST’ and ‘RT FAULT’.
ON Systems transmits in normal operation
60 Narrows antenna scan from 120 deg to 60 deg. Putting back the switch to ‘ON’
position widens the antenna scan to 120 deg.

14. Antenna Controls: TILT Adjusts antenna tilt angle.
STAB OFF System transmits without antenna stabilization; ‘STB OFF’ displayed. This function is used in event of AHRS failure in flight.
Stabilization Range: ± 30 degs combined pitch, roll & tilt.

15. Primary mode selectors:
Wx Selects weather mode, the primary mode of operation. The ‘Wx’ appears at the bottom left of the display.
WxA Selects weather alert mode. The ‘ WxA’ appears at the bottom left of the display.
“TGT ALRT” flashes at the top left of the display, if red return exists within 25 miles beyond the display range.
SRCH Activates Search1 mode, sea clutter rejection (20 miles range or less) or Search 2 mode, short range precision mapping (20 mile range or less) or Search3 mode, normal surface mapping. ‘SR1/SR2/SR3’ appears at the bottom left of the display.

16. Gain Controls:
SRCH GAIN : This rotary knob adjusts radar receiver gain when search mode is selected on control panel. Search gain value shall be displayed below the ‘SRCH GAIN’ title.