a) Make sure the antenna deflects 5 |1 degrees down. 3) Release the DSPL SEL switch to the TK/GS position.
(n)
Set the STAB switch on the WXR indicator to the OFF position.
1) Make sure the antenna goes back to 0 |1 degree of deflection.
(o)
Set the azimuth SCAN switch on the antenna to the ON position.
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(p) Put the guard back on the azimuth SCAN switch.
WARNING: MAKE SURE PERSONS ARE CLEAR OF THE ANTENNA REFLECTOR WHILE
_______ IT SCANS. THE ANTENNA COULD HIT THE PERSONS.
(q)
Push the WX mode switch on the WXR indicator.
1) Make sure the antenna scans 80 |5 degrees to the left and to the right from the center position.
(r)
Set the STAB switch on the WXR indicator to the ON position.
(s)
Set the switch on the inertial reference system display unit (ISDU) as follows. 1) Set and hold the DSPL SEL switch to the TEST position.
a) Make sure the antenna moves from the full up and right
position to the full down and left position. 2) Release the DSPL SEL switch to the TK/GS position. 3) Set the SYS DSPL switch to the L position.
S 865-050
(2) If no more tests of the weather radar are necessary, do the Weather Radar System Shutdown Task.
TASK 34-41-01-845-051
4. Weather Radar System Shutdown
_____________________________
A. General
(1) Do the weather radar system shutdown when the weather radar operational test, or system tests are done.
B. References
(1)
AMM 21-58-00/501, Equipment Cooling
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 34-28-00/201, Inertial Reference System
C. Access
(1) Location Zones
101 Control Cabin, Left
102 Control Cabin, Right
D. Procedure
S 845-052
(1) Do the shutdown procedure.
(a)
Push the STBY mode switch on the WXR indicator.
(b)
Shut down the IRS (AMM 34-28-00/501).
(c)
Set the controls and switches on the WXR indicator to the positions shown: 1) INT - Full counterclockwise
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2) STAB - OFF
3) GAIN - PRE-SET
4) RANGE - 100
5) TILT - 0
6) AZIM - Off
7) SEC SCAN - Off
8) FRZ - Off
9) TGT ALRT - Off
(d) Push the OFF button on the mode selector.
S 865-053
(2)
Remove equipment cooling if it is not necessary (AMM 21-58-00/501).
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-054
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A 737-300/400/500MAINTENANCE MANUAL
WEATHER RADAR SYSTEM - DESCRIPTION AND OPERATION
________________________________________________
1. General
_______
A. The weather radar system is a navigation system which uses the reflective effect of microwave pulses on material substances to obtain a picture of conditions ahead of the airplane. Weather radar operation is based on the fact that water particles present in the air as rainfall (generally associated with storm cells) reflect a radar beam with intensity in proportional to the moisture concentration.
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