(2)
Sub mode field - FRZ message flashes in a cyan or green color.
(3)
Range mark numerics - four range messages are shown on the WXR indicator for each set RANGE. Range and azimuth marks show in a green or a cyan color.
(a)
Range and range mark numerics are shown in green for the MAP mode.
(b)
Range mark and range mark numerics are shown in blue for the WX, WX/T, and the TEST modes.
(c)
The VAR message shows when the GAIN control is out of the PRESET position and the weather radar mode is in the WX or MAP position.
(d)
The VAR message can be cancelled and a FRZ message is shown when the FRZ control is on.
(4)
Target alert field - Shows a letter T or a TGT message in a red triangle.
(a) A letter T message shows when the TGT ALRT switch is on.
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ú ú 10 Page 101 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(b) A red target alert TGT message with an upward pointing arrow flashes when a red or magenta-level target is in the target alert field during ALRT operation.
(5) Auxiliary Field - Numerics 1,2, and 3 and a color bar shows for the WX and Map modes.
(a)
In the WX mode the color bar is green ,yellow, and red.
(b)
In the map mode the color bar is cyan, yellow, and magenta.
2. Trouble Shooting - Weather Radar System_______________________________________
A. General
________
(1) The trouble shooting has these parts:
(a)
The prepare for weather radar system trouble shooting.
(b)
The weather radar system trouble shooting.
B. References
(1)
12-31-11/201, Body Section 41 Access Door and Panel
(2)
21-58-00/501, Equipment Cooling
(3)
24-22-00/201, Manual Control
(4)
34-28-01/201, Inertial Reference System
C. Access
(1)
Location Zones
101 Control Cabin, Left
102 Control Cabon, Right
202 Lower nose Compartment
(2)
Access Door
1103L Forward Access Door
D. Procedure
(1) Prepare for the weather radar system trouble shooting:
(a)
Open the forward access door 1103L to get access to the weather radar receiver/transmitter(Ref 12-31-11/201).
(b)
Supply electrical power (Ref 24-22-00/201).
CAUTION: MAKE SURE THE EQUIPMENT COOLING SYSTEM OPERATES BEFORE THE
_______ ELECTRONIC SYSTEMS ARE OPERATED. THE EQUIPMENT COOLING SYSTEM MUST BE SET FOR CORRECT COOLING. IF THESE CAUTIONS ARE NOT OBEYED, DAMAGE TO THE ELETRONIC SYSTEMS CAN OCCUR.
(c) Supply equipment cooling (Ref 21-58-00/501).
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