(b)  
Stop for 1 minute.

 (c)  
Push the WX mode switch on the WXR indicator. 1) Make sure a test pattern comes into view. 2) Make sure the word TEST shows in the mode field. 3) Make sure you see the color bar in the auxiliary field. 4) Make sure the range marks are clear and not broken.

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737-300/400/500MAINTENANCE MANUAL 
FIELD ALERT TARGET WINDOW ALERT TARGET  SET` 30` PRE CYCWXSTBYOFF ONOFF GAIN RANGE 10 25 50 TEST 300 100 200 0 AZIM A  MAP INT  1 2 3 30` TILT 10 5 0 5 10  -15 +15 F FRZ  RED YELLOW GREEN 
BAND NOISE  60`  100  60` 
SEC  80  TGT 
MARKS RANGE  S SCAN  TEST  20  40  60  ALRT T 
WEATHER MODE 
WINDOW ALERT TARGET  10 25 50 ON 0 WX SET` 30` PRE CYCSTBYOFF OFF GAIN RANGE TEST 300 100 200  MAP INT  1 2 3 10 5 0 5 10 30` TILT  -15 +15  MAGENTA YELLOW CYAN 
AZIM  FRZ 
BAND NOISE  A  100  F 
60`  60` 
SEC  80  TGT 
MARKS RANGE  S SCAN  TEST  20  40  60  T ALRT 
MAP MODE 

Weather Radar Test Displays
Figure 501

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737-300/400/500MAINTENANCE MANUAL
 5) Make sure the range marks have labels of 20, 40, 60, 80, and 100. 6) Make sure the first three color bands are green, yellow,
 and red.

 7)  Make sure the fourth color band (65 to 80 nm) is yellow.
 8)  Make sure the target alert window is red.
 9)  Make sure the noise band between 85 and 95 nmi is solid
 green and extends unbroken across the full display.
 S 715-040
 (3)  Do a test of the controls on the WXR indicator as follows:
 (a)  
Turn the INT control in the two directions. 1) Make sure the intensity of the test pattern changes.

 (b)  
Push the AZIM control.

 1)  Make sure the azimuth marks come into view, each 30 degrees apart.

 (c)  
Push the AZIM control again.
 1) Make sure the azimuth marks go out of view.

 (d)  
Push the SEC SCAN control. 1) Make sure the display decreases to an area equal to 80 degrees.

 2)  Make sure the scan rate is approximately one scan for each 2 seconds.

 (e)  
Push the SEC SCAN control again. 1) Make sure the scan goes back to an area equal to 160 degrees.

 2)  Make sure the scan rate is approximately one scan for each 4 seconds.

 (f)  
When the scan line is at one of the edges of the display, push the TGT ALRT control. 1) Make sure a letter T in a red box comes into view in the

 target alert window. 2) Make sure the letter T is replaced with the letters TGT when the scan line goes into the target alert area.
 NOTE: The letters TGT will flash on and off.
____

 (g)  
Push the TGT ALRT control again. 1) Make sure the target alert window goes out of view.

 (h)  
Push the FRZ button.
 1) Make sure the scan line stops.

 (i)  
Push the FRZ button again. 1) Make sure the scan line immediately moves to align with the

 antenna. 2) Make sure the scan line starts to move as usual.

 (j)  
Push the CYC mode selector.

 1)  Make sure the red areas on the display start to flash off and on approximately once every second.

 (k)  
Push the MAP mode selector.

 1)  Make sure the green and red areas on the display change to magenta and cyan.
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