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A
747-400 FAULT ISOLATION/MAINT MANUAL
NOSE RADOME, 111AL
WEATHER RADAR ANTENNA, B143
SEE A
MAIN EQUIPMENT
CENTER ACCESS
DOOR, 117AL

WEATHER RADAR ANTENNA, B143
A
LEFT RECEIVER/ TRANSMITTER, B138
SEE C
RIGHT RECEIVER/ R/T MOUNT, B139TRANSMITTER, B140
SEE C
EQUIPMENT
RACK, E30
SEE B
WAVEGUIDE SWITCH, B139
EQUIPMENT RACK, E30
B
Weather Radar System - Component Location
Figure 102 (Sheet 1)

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A

747-400 FAULT ISOLATION/MAINT MANUAL 
ASSEMBLY, E5 SHELF 
SEE  B 
111AL NOSE RADOME, 

FWD 
WEATHER RADAR  WEATHER RADAR 
ANTENNA, B143  ANTENNA, B143 
SEE  A  RIGHT RECEIVER/  A 
TRANSMITTER, B140 
SEE  C  SHT 3 
LEFT RECEIVER/ 
TRANSMITTER, B138 
SEE  C  SHT 3 
SHELF 
ASSEMBLY, E5-2 

WAVEGUIDE
RECEIVER/TRANSMITTER MOUNTSWITCH, B139
SHELF ASSEMBLY, E5-1FWD
WAVEGUIDE TO
ANTENNA

SHELF ASSEMBLY, E5
B
Weather Radar System - Component Location Figure 102 (Sheet 2)
D22123
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A

747-400 FAULT ISOLATION/MAINT MANUAL
P7 PANEL
LEFT,RIGHT RECEIVER/TRANSMITTER, B138, B140 (RDR-4A)
C
P8 PANEL  WEATHER RADAR
CONTROL PANEL, B142

SEE D
FLIGHT COMPARTMENT
LEFT,RIGHT RECEIVER/TRANSMITTER, B138, B140 (RDR-4B)
C
SYS  WX  WX RADAR 
L  R  TEST  WX/TURB  TILT 
MAP  +5  +10 
GAIN  +  +15 

0
AUTO MAX -15 -5 -10
WEATHER RADAR CONTROL PANEL, B142 D
Weather Radar System - Component Location Figure 102 (Sheet 3)
L10313
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A
747-400 MAINTENANCE MANUAL
 WEATHER RADAR SYSTEM - ADJUSTMENT/TEST
______________________________________
 1.  General_______
 A.  This subject contains four tasks: the operational test, the ground test, the system test and the system shutdown procedure. The operational test uses the self test circuits to make sure the weather radar system is servicable. The ground test uses the CMC and the CDU to make sure the weather radar system is serviceable. The system test makes sure all functions of the weather radar operate correctly. The system shutdown procedure is used to set the weather radar system and other related airplane equipment back to their usual condition.
 TASK 34-43-00-715-001
 2.  Operational Test - Weather Radar System_______________________________________
 A.  General
 (1)  
The operational test has these parts:

 (a)  
The prepare for a weather radar operational test.

 (b)  
The weather radar system self test.

 (c)  
The test of the controls on the indicators.

 (d)  
The test of the antenna TILT control on the WXR control panel
　
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