(3)
If pressure in the anti-ice ducts reaches 30-39 psig, the overpressure warning switch contacts close and the EICAS status message ANTI ICE NAC 1, 2, 3, or 4 is displayed. The status message will disappear when pressure in the duct drops below 30 psig.
(4)
If ambient air temperature inside the engine cowl exceeds 250 |5° F, the engine cowl overheat switch closes, causing the anti-ice valve to close. The system will remain off until air temperature drops below 250° F and the engine inlet TAI system is turned off and back on. When the switch closes, the EICAS advisory message NAI DUCT 1, 2, 3, or 4 LEAK is displayed.
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MAINTENANCE MANUAL
Engine Inlet Thermal Anti-Ice System Schematic
Figure 2
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MAINTENANCE MANUAL
ENGINE
STARTER
ENGINE 2
BLEED AIR
GROUND SERVICE
PNEUMATIC
CONNECTIONS
Engine Inlet Anti-Ice System Airflow Diagram
Figure 3
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MAINTENANCE MANUAL
(5) If any nacelle anti-ice control switch has been placed in the OFF position, or an engine anti-ice control valve does not open for any reason, the EICAS caution message >ICING NAC is displayed when the ice detector tries to activate that engine inlet anti-ice system. If any control switch has been placed in the ON position, the EICAS advisory message >ANTI-ICE NAC is displayed when total air temperature exceeds 54° F (12° C).
B. Control
(1) To put the engine inlet anti-ice system in the automatic mode, place the four NACELLE ANTI-ICE control switches on the anti-ice-rain removal module to the AUTO position. When the airplane is in the air, the engine inlet anti-ice systems 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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FAULT ISOLATION/MAINT MANUAL
ENGINE INLET THERMAL ANTI-ICE SYSTEM
COMPONENT FIG. SHT 102 QTY ACCESS/AREA AMM REFERENCE
CIRCUIT BREAKERS - 1 FLT COMPT, P6
NACELLE ANTI-ICE ENG 1, C409 1 6J10 *
NACELLE ANTI-ICE ENG 2, C411 1 6J11 *
NACELLE ANTI-ICE ENG 3, C412 1 6J12 *
NACELLE ANTI-ICE ENG 4, C412 1 6J13 *
CIRCUIT BREAKERS - 1 117AL, MAIN EQUIP CTR, P180
ENG AUTO ANTI-ICE CONTROL L, C10574 1 180H15 *
ENG AUTO ANTI-ICE CONTROL R, C10575 1 180E16 *
DIODE - (FIM 31-01-36/101)
ENG 1 FAN CASE OVERHEAT, M3582
ENG 2 FAN CASE OVERHEAT, M3583
DIODE - (FIM 31-01-39/101)
ENG 3 FAN CASE OVERHEAT, M3584
ENG 4 FAN CASE OVERHEAT, M3585
MODULE - ANTI-ICE/RAIN REMOVAL, M7321 1 1 FLT COMPT, P5 *
PROBE - (FIM 30-81-00/101)
L ICE DETECTOR, M6704
R ICE DETECTOR, M6703
RELAY - (FIM 31-01-36/101)
ENG 1 ANTI-ICE COMMAND, R8004
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