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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
No power to windows No. 4 and 5 when side window control switch is positioned to ON. Power to windows No. 4 and 5 does not cut off within proper time or temperature limits Defective switch, defective wiring, thermal switch, or window Defective thermal switch or window Check switch for continuity. IF-No continuity -Continuity OK - Check for ac voltage at window No. 4 input bus terminal. IF -No Voltage -Voltage OK - Check for continuity between windows No. 4 and 5 and between window No. 5 and ground. IF -No Continuity -Check No. 4 and 5 window resistance in accordance with window heat conductive coating adjustment test procedure. IF -Window Resistance OK -Window Resistance Not OK - Replace P5-9 panel Repair wiring between window circuit breaker Repair wiring or replace defective thermal switch or window Replace window thermal switch Replace defective window
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CONTROL CABIN WINDOW ANTI-ICING SYSTEM - ADJUSTMENT/TEST
1. Control Cabin Window Anti-Icing System Test
A. General
(1) The following system tests are intended to provide reasonable assurance prior to airplane flight that the system will operate as designed during service. The window heat control systems are tested in two parts consisting of windows No. 1 and 2, and windows No. 4 and 5. To test window temperature regulation, the test should be conducted when ambient temperatures are below 70°F to ensure cycling of the controls. To conduct test at ambient temperatures above 70°F, cool the windows with running water until window temperature stabilizes below 70°F.
B. Window No. 1 and 2 Heat Control Test
(1)
Equipment and Materials
(a)
Voltmeter, 0-500 volts AC-DC, + 1 percent full scale minimum accuracy
(b)
Instrument for measuring windowpane temperature. Infrared Measurement Instrument, IRE-5OE, Wahl Instruments Inc., Culver City, CA 90231 (Preferred), or Alnor Portable Pyrometer, Type 4000A, Alnor Instrument Co., Skokie, Il 60077 (Alternate)
(2)
Prepare Window No. 1 and 2 Heat Control for Test
(a)
Connect external power supply to airplane.
(b)
Check that the following circuit breakers are closed.
1) On P6-3 panel, MSTR CAUTION BUS
a) NO. 1
b) BATT
2) On P6-3 panel INDICATOR LTS MASTER DIMMING BUS a) NO. 1 DC b) NO. 2 DC c) SECT. 4 d) SECT. 5ffc
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3) On P6-3 panel, DIM & TEST
4) On P6-11 panel, WINDOW ANTI-ICE
a) L FRONT
b) R SIDE
5) On P6-12 panel, WINDOW ANTI-ICE
a) R FRONT
b) L SIDE
6) On P18-3 panel, WINDOW HEAT CONTROL
a) LEFT FRONT AC
b) LEFT FRONT DC
c) LEFT SIDE AC
d) LEFT SIDE DC
e) RIGHT FRONT AC
f) RIGHT FRONT DC
g) RIGHT SIDE AC
h) RIGHT SIDE DC
(c)
Open the following circuit breakers: 1) On P6-11 panel, WINDOW ANTI-ICE, L4 & L5 2) On P6-12 panel, WINDOW ANTI-ICE, R4 & R5
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