M49165
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 30-21-00
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A
747-400 FAULT ISOLATION/MAINT MANUAL
ACCESS DOOR 451AL (ENG 1) 461AL (ENG 2) 471AL (ENG 3) 481AL (ENG 4)
MANUAL
OVERRIDE ANTI-ICE (REF) DUCT
SEE D SEE C
ELECTRICAL CONNECTOR  S789 (ENG 1) S790 (ENG 2) S791 (ENG 3) S792 (ENG 4) NOSE COWL PRESSURE SWITCH  V88 (ENG 1) V159 (ENG 2) V160 (ENG 3) V161 (ENG 4) ENGINE TAI VALVE 
ANTI-ICE DUCT 
C 

MANUAL OVERRIDE (REF) D
Engine Inlet Thermal Anti-Ice System - Component Location
Figure 102 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 ENGINE INLET THERMAL ANTI-ICE SYSTEM - ADJUSTMENT/TEST
______________________________________________________
 1.  General_______
 A.  There are three tasks in this subject. The first task is an operational test for the engine inlet thermal anti-ice (TAI) system. In this test, the NACELLE ANTI-ICE switches in the flight compartment are set to the on and off positions. The operation of the system is monitored on the main EICAS. Pneumatic power is necessary for this test. This test can be done while the engine operates.
 B.  The second task is a duct overpressure indication test. The test is the same for any engine.
 C.  The third task is a system test. The test is the same for any engine. The test has these parts:
 -Open the access door on the forward fairing of the strut or remove the forward fairing
 -Set the system control switches to the on and off positions
 -Measure voltages at the TAI valve electrical connector
 -Remove the nose cowl pressure switch
 -Open the fan cowl panels
 -Connect pins on TAI system electrical connectors together
 -Monitor EICAS messages
 -Do an operational test of the ice detection system.
 TASK 30-21-00-715-001
 2.  Operational Test - Engine Inlet Anti-Ice System_______________________________________________
 A.  References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 36-00-00/201, Pneumatic System

 (3)
SSM 30-21-01, SSM 30-21-02, SSM 30-21-03, SSM 30-21-04

 (4)
WDM 30-21-11, WDM 30-21-21, WDM 30-21-31, WDM 30-21-41

 B.  Access
 (1)  Location Zone
 221, 222 Control Cabin

 C.  Preconditions
 S 865-086
 (1) These conditions are necessary for this task:
 (a) Electrical power on (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 (b) Pneumatic system power is on (AMM 36-00-00/201).
 D. Procedure
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Supply pneumatic power (AMM 36-00-00/201).

 S 715-004
 CAUTION: IF THE PNEUMATIC AIR IS HOT (APPROXIMATELY 350°F), DO NOT OPEN
_______ THE ENGINE INLET ANTI-ICE VALVE FOR MORE THAN 30 SECONDS. AFTER THE VALVE CLOSES, LET THE INLET COWL BECOME COOL. TOO MUCH HEAT CAN CAUSE DAMAGE TO THE INLET COWL.
 (3)  Make sure that the anti-ice valves open:
 (a)  
Set the NACELLE ANTI-ICE 1, 2, 3, and 4 switches on the anti-ice/rain removal module (P5 panel) to the ON position.

 (b)  
Make sure that the word NAI shows in green to the left of each engine N1 indicator on the main EICAS.
　
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