(b)  
Set the captain's and the first officer's ND brightness controls as follows: 1) Outer knob - middle position 2) Inner knob - middle position

 (c)  
Set the switches and the controls on the captain's and the first officer's EFIS control panel as follows: 1) WXR switch/indicator - off 2) Mode selector - VOR 3) Range - 40 4) L ADF/VOR - OFF 5) R ADF/VOR - OFF

 (d)  
Open these circuit breakers.

 1)  P7 Overhead Circuit Breaker Panel a) 7C7 WXR L RT b) 7C19 WXR R RT
 S 865-210
 (2)  Remove electrical power if it is not necsssary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 TASK 34-43-00-735-048
 4.  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 tests are in the operational test. Tests that show radar video must, if possible, have the airplane pointed so the antenna sector include hills and mountains.

 (2)  
The stabilization test is divided into two separate tests. The first test operates through the CMC and the CDU. An alternate test uses the IRU test switch. Each test makes sure the stabilization circuits in the weather radar are serviceable.

 (3)  
The weather radar control panel is referred to as the WXR control panel.

 (4)  
The system test has these parts:

 (a)  
The Prepare to do a Weather Radar System Test

 1)  The prepare to do a test must be completed before the system test can be done. But, the prepare to do a test procedure does not need to be repeated before each system test part.

 (b)  
The EIU Switching Test

 (c)  
CDU Alternate EFIS Control Panel Test

 (d)  
The Mode Test

 (e)  
The ND Display Test

 (f)  
The Terrain/Weather Switch Display Test

 (g)  
The Gain Test

 (h)  
The Antenna Tilt Test

 (i)  
The Stabilization Test

 B.  Standard Tools and Equipment
 (1)  Warning lights
 C.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 34-21-00/201, Inertial Reference System

 (3)  
AIRPLANES WITH PREDICTIVE WINDSHEAR ACTIVE; The weather radar system with PWS interface with the systems listed below:

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747-400 MAINTENANCE MANUAL
 (a)  
AMM 31-51-00, Modular Avionics Warning Electronics Assembly

 (b)  
AMM 31-61-00, EFIS/EICAS Interface Unit

 (c)  
AMM 34-12-00, Air Data System

 (d)  
AMM 34-33-00, Radio Altimeter System

 (e)  
AMM 34-45-00, Traffic Alert and Collision Avoidance System

 (f)  
AMM 34-46-00, Ground Proximity Warning System

 D. Access
 (1)  Location Zone
 116 Area Between Nose Gear Well and Fuselage, RH
 117 Electrical and Electronic Compartment, LH
 221 Control Cabin, Left
 222 Control Cabin, Right

 E. Prepare to do a Weather Radar System Test
 S 585-049
 (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 945-050

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

 S 865-051

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

 S 865-232

 (4)  
Align the left, right, and center IRUs in NAV mode
　
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