_________
A. Functional Description (Fig. 2)
(1)
Conditioned air flows to the compartment when the main distribution manifold is pressurized by the air conditioning packs or by conditioned air ground cart.
(2)
The captain and first officers windshield air shutoff valves are each controlled by separate heater and windshield air control modules. There is an ON/OFF switch labeled WSNLD AIR on each module. By setting the switch to ON, 28 volts dc is supplied to open the valve. With the switch set to OFF, 28 volts dc is supplied to close the valve.
B. Control
(1)
Supply conditioned air to the airplane by ground cart or air conditioning pack operation (Ref 21-00-00). This supplies conditioned air to the flight deck gaspers and diffusers.
(2)
Set the WSHLD AIR switch to ON. This supplies conditioned air to the front windshield.
(3)
To shut down the system remove the conditioned air source (Ref 21-00-00) and set the WSHLD AIR switch to OFF.
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A
747-400 MAINTENANCE MANUAL
FLIGHT COMPARTMENT
SHOULDER HEAT SWITCH
HEATER AND WINDSHIELD AIR CONTROL MODULE
Flight Compartment Condition Air Distribution Equipment Location
Figure 1 (Sheet 1)
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21-22-00
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ú 01 Page 2
ú Jun 18/99
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A
747-400
MAINTENANCE MANUAL
MANUAL OVERRIDE/ POSITION INDICATOR (ON SOME VALVES)
WINDSHIELD AIR SHUTOFF VALVE
WINDSHIELD AIR SHUTOFF VALVE C
CLAMP ELECTRICAL CONNECTOR
WINDSHIELD AIR
SHUTOFF VALVE
FWD
FWD
WINDSHIELD AIR SHUTOFF VALVE C
NOTE: DIFFERENT WINDSHIELD AIR SHUTOFF VALVES CAN BE INSTALLED. REFER TO IPC FOR APPLICABILITY.
Flight Compartment Condition Air Distribution Equipment Location Figure 1 (Sheet 2)
K30336
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A
747-400
MAINTENANCE MANUAL
Flight Compartment Condition Air Distribution Equipment Location
Figure 1 (Sheet 3)
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21-22-00
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K30169
A
747-400
MAINTENANCE MANUAL
28V DC BUS WSHLD AIR
P180 DC POWERDISTRIBUTION PANEL
M7375 CAPT HEATER V464 CAPT WINDSHIELD CONTROL MODULE (P44) AIR SHUTOFF VALVE
Windshield Air Shutoff Valve Schematic
Figure 2
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A
747-400 MAINTENANCE MANUAL
WINDSHIELD AIR SHUTOFF VALVE - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. This procedure contains two tasks: removal and installation of a windshield air shutoff valve.
B. The steps that are necessary for removal of a windshield air shutoff valve are as follows:
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