WASHER FLUID
CONTAINER

WINDSHIELD WASHER PUMP, M13
RIGHT WINDSHIELD WASHER SOLENOID VALVE, V34 REPELLENT FLUID CONTAINER
SHUTOFF
VALVE (REF)
VISUAL RESERVOIR (REF)
PRESSURE
GAUGE (REF)
FLIGHT COMPARTMENT CLOSET
I
RIGHT RAIN REPELLENT
LEFT RAIN SOLENOID VALVE,
REPELLENT V32
SOLENOID VALVE, V31
RAIN REPELLENT
TAT PROBE BLEED SUPPLY LINE AIR SUPPLY (REF) (REF)
ACCUMULATOR TANK (REF)
STA 260 BULKHEAD
K FROM SHT 1
Windows and Windshield - Component Location Figure 102 (Sheet 3)
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 ALL  ú ú 01 Page 105 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 FLIGHT COMPARTMENT WINDOW ANTI-ICE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________________
General (Fig. 1)
_______
 A.  The flight compartment windows are electrically heated to provide anti-icing for the No. 1 front windows and to provide defogging for the No. 2 and 3 side windows. Heat applied to the windows also increases their impact strength.
 B.  Anti-icing heat is applied to each No. 1 window (windshield) by separate window heat control units when activated from the flight deck. Defogging heat is applied to the four side windows by separate on-off control thermostats installed on the inside surface of each windowpane. No. 2 and 3 window heat is enabled whenever airplane electrical power is on.
 C.  The flight compartment window anti-icing system consists of two control switches in the anti-ice-rain removal module, located in the P5 panel, two window heat controllers located in the main electrical equipment center, heating elements (conductive coating) and sensors laminated in the No. 1 windows, heating elements laminated in the No. 2 and 3 windows, and control and overheat thermostats and relays for the No. 2 and 3 windows.
 D.  Line-to-line power (200 volts) for the No. 1 window heaters, control circuits, and fault indication is from the 115-volt ac bus 4 for the left window and bus 2 for the right window. BITE power for the left window heat control unit is from the 28-volt dc bus 3 and for the right unit from 28-volt dc bus 1. Power for the No. 2L and 3R window heaters is from the 115-volt ac bus 2 for the heaters and from the 28-volt dc bus 2 for fault indication. Power for the No. 3L and 2R window heaters is from the 115-volt ac bus 3 for the heaters and from the 28-volt dc bus 3 for fault indication.
Anti-Ice-Rain Removal Module
____________________________
 A.  The anti-ice-rain removal module M7321 on the P5 overhead panel contains two switches which control operation and provide fault indication for the No. 1 windows. Each switch has an ON indicator and an INOP fault light. When the switch is pressed the white ON indicator appears and the heating process for the corresponding No. 1 window is started. The amber INOP light is on when there is no power supplied to the No. 1 window or when a system fault is detected.
No. 1 Window Heat Control Units
_______________________________
 A.  The two window heat control units proportionally regulate the heat applied to each No. 1 window. Unit M73 controls the left window heat and is located on the E1-4 electronics shelf. Unit M237 controls the right window heat and is located on the E2-3 shelf.
 B.  Each unit controls the power delivered to the window by SCR phase angle switching of the 200-volt line-to-line input voltage. The thermistor sensor in the window provides temperature information to the control unit. Using this information, the control unit applies the power necessary to maintain the window in the required temperature range.
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 ALL  ú ú 01 Page 1 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
1L 1R
OVERHEAT THERMOSTAT
SEE C
2L 2R CONTROL
　
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