PRIMUSr 880 Digital Weather Radar System
1 RADAR
This rotary switch is used to select one of the following functions.
DOFF - This position turns the radar system off.
DSBY (Standby) - This position places the radar system in standby; a ready state, with the antenna scan stopped, the transmitter inhibited, and the display memory erased. STBY is displayed on the
EFIS/MFD.
DWX (Weather) - This position selects the weather detection mode. The system is fully operational and all internal parameters are set
for enroute weather detection.
If WX is selected before the initial RTA warmup period is complete (approximately 45 to 90 seconds), the WAIT legend is displayed on the EFIS/MFD. In WAIT mode, the transmitter and antenna scan are inhibited and the display memory is erased. When the warmup is
complete, the system automatically switches to the WX mode.
The system, in preset gain, is calibrated as described in table 3- 3.
Rainfall Rate | Color | |
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in/hr | mm/hr |
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1- 4 | Green | |
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4- 12 | Yellow | |
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.47- 2 | 12- 50 | Red |
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> 2 | >5 0 | Magenta |
Rainfall Rate Color Coding
Table 3- 3
DRCT (Rain Echo Attenuation Compensation Technique) - This switch position turns on RCT.
The REACT circuitry compensates for attenuation of the radar signal as it passes through rainfall. The cyan field indicates areas where further compensation is not possible. Any target detected within the cyan field cannot be calibrated and should be considered dangerous. All targets in the cyan field are displayed as 4th level
precipitation, magenta.
RCT is a submode of the WX mode and selecting RCT forces the system to preset gain. When RCT is selected, the RCT legend is
displayed on the EFIS/MFD.
A28- 1146- 102- 00 | Operating Controls |
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