(3)
When the valve opens, the green message WAI appears in two places on the main EICAS display at the base of engine N1 indicators.
(4)
When the control switch is placed in the AUTO position, the ice detector will send a signal to open the valve when sufficient ice buildup is sensed. When icing conditions are no longer sensed, the valve is commanded to close.
(5)
If the control switch is in the OFF position or either valve does not open for any reason, the EICAS caution message >ICING WING is displayed when the ice detection system tries to open the valve. If the switch is in the ON position, the EICAS advisory message >ANTI ICE WING is displayed when total air temperature exceeds 54° F (12° C).
B. Control (Fig. 1)
(1) To place the wing anti-ice system in automatic mode, place the WING ANTI-ICE switch on the anti-ice-rain removal module to the AUTO position. When the airplane is in the air, the wing anti-ice system will be automatically activated when icing conditions are detected. Place the control switch to the ON or OFF position to override automatic control.
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747-400
MAINTENANCE MANUAL
M7353 L EIUM7352 CTR EIU M7351 R EIUM7321 ANTI-ICE
P414 LEFT POWER
E1-4 ELECTRONICS SHELF
RAIN REMOVALE2-6 ELECTRONICS SHELF DISTRIBUTIONMODULE (P5) CENTER
Wing Thermal Anti-Ice System Schematic
Figure 2
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747-400 MAINTENANCE MANUAL
(2) A ground test may be performed by selecting the ground test of the ice detection system with the CMCS.
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747-400 FAULT ISOLATION/MAINT MANUAL
WING THERMAL ANTI-ICE SYSTEM
COMPONENT FIG. SHT 102 QTY ACCESS/AREA REFERENCE AMM
CIRCUIT BREAKERS - 1 FLT COMPT, P6
WING ANTI-ICE VLV, C66 1 6C8 *
DIODE - (FIM 31-01-39/101) M3411 M3414 M3904 COMPUTER - (FIM 45-10-00/101) R CENTRAL MAINTENANCE, M7374 L CENTRAL MAINTENANCE, M7373 WING ANTI-ICE CONT, C67 1 6C9 *
FLAP LOCKOUT 1, R8325 R ICE DETECTOR, M6703 L ICE DETECTOR, M6704 FLAP LOCKOUT 2, R8326 FLAP LOCKOUT 3, R8327RELAY (FIM 31-01-39/101) RELAY - (FIM 31-01-36/101) PROBE - (FIM 30-81-00/101) CMC ENABLE RELAY 8, R8087 AIR/GROUND, R227 AUTO/TEST, R7778 L VALVE DISAGREE, R7534 WING ANTI-ICE, R7536 TIME DELAY WING TAI, R7776 R VALVE OPEN, R7428 R VALVE DISAGREE, R7427 L VALVE OPEN, R7535 MODULE - ANTI-ICE/RAIN REMOVAL, M7321 1 1 FLT COMPT, P5 *
SWITCH - WING ANTI-ICE CONTROL, YMLAS5 1 1 FLT COMPT, P5, ANTI-ICE/RAIN *
UNIT - (FIM 27-50-00/101) C FLAP CONTROL, M7880 L FLAP CONTROL, M7881 R FLAP CONTROL, M7879UNIT - (FIM 31-61-00/101) R EFIS/EICAS INTERFACE, M7351 L EFIS/EICAS INTERFACE, M7353 C EFIS/EICAS INTERFACE, M7352 REMOVAL MODULE, M7321
VALVE - L WING ANTI-ICE, V152 1 1 L WING ABOVE LE FLAP #6 30-11-03
VALVE - R WING ANTI-ICE, V153 1 1 R WING ABOVE LE FLAP #21 30-11-03
* SEE WDM EQUIPMENT LIST
Wing Thermal Anti-Ice System - Component Index
Figure 101
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