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A 737-300/400/500MAINTENANCE MANUAL
 TASK 34-41-02-735-030
 3. System Test - Weather Radar System
__________________________________
 A. General
_______
 (1)  
The system test supplies a full test of the weather radar system but does not include some display tests. These display test are in the operational test. Test that show radar video, the airplane should be pointed so the antenna sector can scan hills, mountains or various height in the distance.

 (2)  
The system test are as follows:

 (a)  
The Mode test

 (b)  
The EHSI Display Test

 (c)  
The Gain Test

 (d)  
The Antenna Tilt Test

 (e)  
The Ground Clutter Suppression Test

 (f)  
The Stabilization Test.

 B. References
 (1)  
AMM 21-58-02/501, Equipment Cooling

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 34-28-01/201, Inertial Reference System

 (4)  
AMM 34-41-02/501, Weather Radar System

TEST PASS MESSAGE
MAGENTA

ANTENNA TILT MESSAGE
RED

YELLOW

GREEN MESSAGE
Weather Radar Test Mode
Figure 501

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737-300/400/500MAINTENANCE MANUAL
 C.  Access
 (1)  Location Zones
 101 Control Cabin, Left
 102 Control Cabon, Right

 D.  Prepare to do a Weather Radar System test:
 S 585-005
 (1)  
Point the airplane away from all large metal objects and to an open area. The antenna scan can include hills or mountains at different heights in the distance.

 S 945-006

 (2)  
Set the warning lights around the front of the airplane in an arc 50 feet from the radome.

 S 865-007

 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 865-050

 (4)  
Supply equipment cooling (AMM 21-58-02/501).

 S 735-009

 (5)  
Do an Operational Test for the weather radar system.

 E.  Mode Test
 S 735-010
 (1)  Do the weather radar mode test.
 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.
 1)  Make sure the mode messages are shown on each EHSI as given below (Fig. 502). a) WX MODE - WX EHSI mode message
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737-300/400/500MAINTENANCE MANUAL
 b) WX/T MODE - WX+T EHSI mode message c) MAP MODE - MAP EHSI mode message d) IDNT switch - WX+T EHSI mode message
 (b)  If no more tests of weather radar are necessary, do the Weather Radar System Shutdown Procedures.
 F. EHSI Display Test
 S 735-024
 (1)  Do the EHSI display test.
 WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR
　
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