(b)  
Turn the GAIN control between MIN and MAX to get a middle level of radar targets. 1) Make sure the gain mode data shows VAR/MAP on each EHSIs.

MODE MESSAGE
ANTENNA TILT MESSAGE
MODE MESSAGE
ANTENNA TILT MESSAGE

RANGE ARCS HALF RANGE MESSAGE
STATUS AND
FAIL MESSAGES

Figure 502

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A
737-300/400/500MAINTENANCE MANUAL
 (c)  
Turn the GAIN control to the MIN position.

 1)  Make sure the radar returns on each EHSI decreases in intensity.

 (d)  
Turn the GAIN control to the MAX position.

 1)  Make sure the radar returns on each EHSI increase in intensity.

 (e)  
Set the GAIN control to the CAL position.

 (f)  
Push the WX MODE switch on the WXR control panel.

 (g)  
Turn the GAIN control between MIN and MAX to get a middle level of radar targets. 1) Make sure the gain mode data shows VAR/MAP on each EHSIs.

 (h)  
Turn the GAIN control to the MIN position.

 1)  Make sure the radar returns on each EHSI decreases in intensity.

 (i)  
Turn the GAIN control to the MAX position.

 1)  Make sure the radar returns on each EHSI increase in intensity.

 (j)  
Set the GAIN control to the CAL position.

 (k)  
Push the WX+T MODE switch on the WXR control panel.

 (l)  
Turn the GAIN control between MIN and MAX to get a middle level of radar targets. 1) Make sure the gain mode data shows VAR/MAP on each EHSIs.

 (m)  
Turn the GAIN control to the MIN position.

 1)  Make sure only the weather returns on each EHSI decreases in intensity.

 (n)  
Turn the GAIN control to the MAX position.

 1)  Make sure only the weather returns on each EHSI increase in intensity.

 (o)  
Set the GAIN control to the CAL position.

 (p)  
Set the antenna TILT control to 0°.

 (q)  
If no more tests the of the weather radar are necessary, do the Weather Radar System Shutdown Procedures.

 H.  Antenna Tilt Test
 S 735-014
 (1)  Do the antenna tilt test.
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A 737-300/400/500MAINTENANCE MANUAL
 WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR
_______ REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY WHILE FUEL IS ADDED OR REMOVED IN AREA 200 FEET OR LESS OF THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.
 DO NOT OPERATE THE WEATHER RADAR IN A HANGAR OR OTHER ENCLOSURE.
 DO NOT OPERATE THE WEATHER RADAR WHILE THE AIRPLANE IS IN A HANGAR OR OTHER ENCLOSURE. MAKE SURE NO PERSONS ARE IN THE AREA 15 FEET OR LESS FROM THE ANTENNA WHEN IT TRANSMITS RF ENERGY. RF ENERGY CAN CAUSE INJURY TO PERSONS.
 (a)  
Push the WX MODE switch on the WXR control panel.

 (b)  
Set the range switch on each EFIS control panel to move the radar targets to the center of each EHSI.

 (c)  
Turn the TILT control on the WXR control panel to 0 degrees.

 1)  Make sure the tilt message on the EHSIs show the correct tilt angle | 0.5 degree.

 (d)  
Turn the antenna TILT control on the WXR control panel in steps from 0 to plus 4.75 degrees. 1) Make sure the tilt messages on the EHSIs show the correct

 tilt angle | 1 degree. 2) Make sure the close in targets on the EHSIs decrease in intensity.

 (e)  
Turn the antenna TILT control on the WXR control panel in steps from plus 5 to 15.00 degrees. 1) Make sure the tilt messages on the EHSIs shows the correct

 tilt angle | 2 degree.

 (f)  
Turn the antenna TILT control on the WXR control panel in steps from 0 to minus 4.75 degrees. 1) Make sure the tilt messages on the EHSIs, show the correct
　
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