S 865-045

 (2)  
Remove electrical power (AMM 24-22-00/201).

 TASK 30-11-00-735-006
 4.  System Test - Wing Thermal Anti-Ice System
__________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flaps

 (3)  
AMM 30-81-00/501, Ice Detection System

 (4)  
AMM 31-61-00/201, Integrated Display System

 (5)  
AMM 32-09-02/201, Air/Ground Relay System

 (6)  
AMM 36-00-00/201, Pneumatic System

 (7)  
SSM 30-11-01

 (8)  
WDM 30-11-11

 B.  Access
 (1)  Location Zone 221 Control Cabin, LH 222 Control Cabin, RH 531 Leading Edge to Front Spar, Left Wing at Outboard Engine 631 Leading Edge to Front Spar, Right Wing at Outboard Engine
 C.  Preconditions
 S 865-051
 (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)  
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).

 (c)  
Air/Ground Relay System is serviceable (AMM 32-09-02/201).

 D. Prepare for the Test
 S 865-007
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-008

 (2)
Do this task: "Leading Edge Flap Extension" (AMM 27-81-00/201).

 S 865-032

 (3)  
Do this task: "Extended Leading Edge Flaps Deactivation and Safety Locks Installation" (AMM 27-81-00/201).

 S 845-010

 (4)  
Make sure that there is no pressure in the bleed air duct of the applicable wing (AMM 36-00-00/201).

 E. Wing Anti-Ice System Test
 S 715-011
 (1)  Do this test of the system ground mode:
 (a)  
Open 6C8, WING ANTI-ICE VLV and 6C9 WING ANTI-ICE CONT circuit breakers on the P6, Main Power Distribution Panel.

 (b)  
Make sure that the EICAS advisory messages WAI VALVE LEFT and WAI VALVE RIGHT show.

 (c)  
Set the WING ANTI-ICE switch on the anti-ice/rain removal module to the ON position.

 (d)  
Make sure that the position indicator on the top of each wing anti-ice valve points to "CLOSED."

 (e)  
Turn the manual override handle on each wing anti-ice valve to the "OPEN" position. Then turn it back to the "CLOSED" position. 1) Make sure that each valve moves freely.

 S 045-029
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Prepare Safety-Sensitive Systems for Air Mode Simulation" (AMM 32-09-02/201).

 S 715-012

 (3)  
Do this test of valve operation and indication:

 (a)  Open 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
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 (b)  Close 6C8, WING ANTI-ICE VLV circuit breaker on the P6, Main Power Distribution Panel.
 (c)  1) Make sure that the wing anti-ice valves do not move.Close 6C9, WING ANTI-ICE CONT circuit breaker on the P6, Main Power Distribution Panel.
 (d)  1) Make sure that the wing anti-ice valves move to the full open position in less than 4 seconds.Set the WING ANTI-ICE switch to the off position. 1) Make sure that the wing anti-ice valves move to the fully closed position in less than 4 seconds. 2) Make sure that the message WAI does not show on the main EICAS.
　
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