When You Release the Light Test Switch,
Master Caution and Window Anti-Ice Lights Stay On.
Figure 104
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A 737-300/400/500MAINTENANCE MANUAL
PREREQUISITES
THE WINDOW ANTI-ICE SWITCHES ARE ON THE WINDOW IS COOL
THE MASTER CAUTION AND THE OVERHEAT LIGHTS DO NOT OPERATE CORRECTLY WHEN YOU PUT THE TEST SWITCH IN THE OVERHEAT POSITION.
FRONT C393 WINDOW ANTI-ICE RIGHT SIDE C228 WINDOW ANTI-ICE LEFT FRONT C392 WINDOW ANTI-ICE LEFT SIDE.
REPLACE THE WINDOW HEAT CONTROL UNIT WITH THE WINDOW HEAT CONTROL UNIT FOR THE ADJACENT WINDOW. CLOSE THE CIRCUIT BREAKERS ABOVE.
DOES THE OVERHEAT LIGHT GO OFF?
(AMM 30-09-11/401). IF THE TROUBLE REMAINS, REPAIR THE WIRING BETWEEN THE P5-9 MODULE AND THE WINDOW HEAT CONTROL UNIT (WDM 30-41-11,12).
The Master Caution and the Overheat Lights Do Not Operate
Correctly When You Put the Test Switch in the Overheat Position.
Figure 105
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737-300/400/500MAINTENANCE MANUAL
DURING A SYSTEM PREREQUISITES TEST, THE VOLTAGE
WINDOW ANTI-ICE SWITCHES ARE ON AT THE NO. 1 OR NO. 2 WINDOWS IS NOT CORRECT.
1 CONNECT A VOLTMETER TO THE NO 21 REPLACE THE WINDOW HEAT
WINDOW. PUT THE TEST SWITCH CONTROL UNIT.
IN THE POWER POSITION. IF THE TROUBLE REMAINS,
DOES THE VOLTAGE INCREASE? REPAIR THE WIRING BETWEEN THE
During A System Test, the Voltage at the No. 1 or No. 2 Window is Not Correct.
Figure 106
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WINDOW NO. 4 OR PREREQUISITES
NO. 5 ANTI-ICE DOES ELECTRICAL POWER (AMM 24-22-00/201)
NOT OPERATE WINDOW ANTI-ICE SWITCHES OFF
CORRECTLY WINDOWS NO. 4 AND NO. 5 COOL
NO
2 MEASURE CONTINUITY THROUGH THE THERMAL SWITCH.
IS THERE CONTINUITY THROUGH THE SWITCH?
YES
3 PRESS THE WINDOW ANTI-ICE SWITCH TO THE ON POSITION.
IS THERE VOLTAGE AT THE B TERMINAL OF THE NO. 4 WINDOW.
A 737-300/400/500MAINTENANCE MANUAL
YES
NO
NO
NO
NO
33 REPLACE THE P5-9 MODULE (AMM 30-09-11/401).
IF THE TROUBLE REMAINS, REPAIR THE WIRING FROM THE P5-9 MODULE TO THE NO. 4 WINDOW (WDM 30-41-11,-12).
34 REPAIR THE WIRING FROM THE
NO. 4 WINDOW TO THE THERMAL
SWITCH.
IF THE TROUBLE REMAINS, REPLACE THE WINDOW (AMM 56-11-31/401).
Window No. 4 or No. 5 Anti-Ice Does Not Operate Correctly
Figure 107
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737-300/400/500MAINTENANCE MANUAL
CONTROL CABIN WINDOW ANTI-ICING SYSTEM - ADJUSTMENT/TEST
________________________________________________________
1. General
_______
A. This task is a system test of the control cabin window anti-icing system.
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