(b)  
Make sure that the message WAI is not shown on the main EICAS.

 S 865-031
 (7)  
Close 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.

 S 445-028

 (8)  
Do this task: "Put Safety-Sensitive Systems Back to the Condition before Air Mode Simulation" (AMM 32-09-02/201).

 S 865-005

 (9)  
Remove electrical power (AMM 24-22-00/201).

 TASK 30-11-00-715-034
 3.  Ground Test - Wing Thermal Anti-Ice System__________________________________________
 A. General
 (1)  The ground test for the wing thermal anti-ice system commands the left and right wing TAI valves to open and close. The valves fail if they do not move to their commanded positions.
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  Location Zone
 221, 222 Control Cabin

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 D.
E.
F.
A
747-400 MAINTENANCE MANUAL
Preconditions
 S 865-050
 (1)  These conditions are necessary for this task:
 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS) is serviceable

 (AMM 31-61-00/501).Prepare for the Test
 S 865-035
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-047

 (2)  
Make sure that there is no pneumatic power supplied to the pneumatic system (this prevents the flow of hot air through the wing leading edge during the test).

 S 865-036

 (3)  
Set the WING ANTI-ICE switch on the anti-ice/rain removal module (P5 panel) to off.

 S 865-038

 (4)  
Set the GND TEST switch on the P461, Overhead Maintenance Panel to ENABLE.

 S 865-039

 (5)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line-select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.

 (d)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (e)  
Push the NEXT PAGE key until you find <30 ICE AND RAIN.

 (f)  
Push the LSK that is adjacent to <30 ICE AND RAIN to show the GROUND TESTS menu for the ice and rain system.

 NOTE: If INHIBITED shows above <WTAIS, the test will not
____
 operate.

Wing TAI System Ground Test
 S 745-040
 (1)  Push the LSK that is adjacent to the <WTAIS prompt.
 NOTE: IN PROGRESS will show during the test.
____
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A
747-400
MAINTENANCE MANUAL

 S 745-042
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <WTAIS.
 NOTE: If a PASS indication shows, no failures occurred during the
____
 test.

 (a)  If FAIL> shows, look for wing anti-ice system CMCS messages: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 G.  Put the Airplane in Its Usual Condition
　
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