“Whoop, Whoop” or “Monitor Radar Display” is selected at installation.
3. Check the display: 

a. Confirm the presence of test bands.  The test pattern display is similar for all ranges.

b. Confirm that the alphanumeric legends are displayed.

c. If the test bands are missing and the name of a line replaceable unit (LRU) appears on the display, there is a fault in that unit.  Refer to FAULT ANNUNCIATIONS on page 30. 

The antenna will remain parked except for a momentary test where a box-shaped scan pattern is performed once.  This test does not pose a hazard to personnel on the ground.  Test mode will complete in approximately 50 seconds.  Some electronic displays may display test information differently.  Refer to the Airplane Flight Manual or Supplement for specific annunciations related to the weather radar. 

SYSTEM SELECTION 
Radar data is displayed whenever WXR mode is selected on any electronic display or on a dedicated radar indicator.  When on the ground, the radar will not transmit if WXR is deselected, or if the radar is in TEST mode.  When in the air the radar scans continuously, always updating the memory so that current weather is immediately available.  This is true even if TEST is selected, or if WXR is deselected on all displays.  (See also ON/OFF on page 5.).
Dual radar systems (two independent radar processing systems) include the CP-1B control panel.  In this case, place the System Control Knob in either the L or R position to put the left or right system into normal weather mode.
Single radar systems (only one radar processing system) utilize the CP-1A control panel.  In this case, place the System Control Knob in the NORM position to put the system into normal weather mode. 
Upon initial activation of the radar, or when switched from one system to the other (L or R), the radar first looks at the part of the sky that is near the aircraft’s altitude.  This data is displayed as soon as it is available.  As data is gathered from the remainder of the sky in front of the aircraft, the display quickly fills in with any additional information.  It takes no more than 30 seconds for the complete picture to become available.  Note that when switching from one system to the other, the weather depicted may not exactly match what was previously displayed due to the loss of “historical” data from the other system.  Therefore, there is no advantage in switching from one side of the radar to the other, except in the case of the failure of one side.

WEATHER DETECTION
AUTOMATIC WEATHER MODE (AUTO) 
GENERAL DESCRIPTION 
AUTO mode provides weather, turbulence, and predictive windshear detection.  The system processes the data to fill the 3D memory and extracts the selected data for display.  When a PWS event is detected, an icon is shown on the display.  Returns determined to be ground clutter are not shown. 
Weather targets are color-coded by the intensity of the return.  The display correlation to approximate rainfall (with Gain set to CAL) is as follows: 
Reflectivity Color Codes (Gain at CAL)
Color
 Returns
 Reflectivity
 Rainfall Rate
 
Black
 Very light or none
 Less than 20 dBz
 Less than 0.7 mm/hr (0.028 in/hr)
 
Green
 Light
 20 – 30 dBz
 0.7 – 4 mm/hr
(0.028 – 0.16 in/hr)
 
Yellow
 Medium
 30 – 40 dBz
 4 – 12 mm/hr 
(0.16 – 0.47 in/hr)
 
Red
 Strong
 40 dBz or greater
　
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