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WEATHER RADAR (RDR 1400C) SYSTEM :
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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.
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• The Primary system components of weather Radar system are
• Receiver – Transmitter unit, • Radar Control panel, • Antenna Drive & Antenna Array and • Navigation concentrator.
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• 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)
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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.
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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.
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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.
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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.
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