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747-400 MAINTENANCE MANUAL
 S 864-017
 (2)  
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.

 S 864-018

 (3)  
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 <21 EQUIPMENT COOLING.

 (f)  
Push the LSK that is adjacent to <21 EQUIPMENT COOLING to show the GROUND TESTS menu for the equipment cooling system.

 (g)  
Push the NEXT PAGE key until you find <EQUIPMENT COOLING.

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

 (h)  If INHIBITED shows above <EQUIPMENT COOLING: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
 test menu again.
 S 714-019
 (4)  Push the LSK that is adjacent to <EQUIPMENT COOLING.
 (a)  
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed. (Push the NEXT PAGE key to see subsequent pages.)

 (b)  
Push the LSK that is adjacent to START TEST>.

 NOTE: IN PROGRESS shows during the test.
____
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 S 714-020
 (5)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <EQUIPMENT COOLING.
 NOTE: If a PASS indication shows, no failures occurred during the
____
 test.

 (a)  If FAIL> shows: 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.
 E.  Put the Airplane Back to its Usual Condition
 S 864-021
 (1)  
Set the GND TESTS switch to the NORM position.

 S 864-022

 (2)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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 EQUIPMENT COOLING FAN SCREEN - CLEANING
_______________________________________
 1.  General
_______
 A.  The equipment cooling fan screens can become contaminated with unwanted materials which can prevent correct fan operation. This procedure gives instructions to clean the fan screens. It is necessary to remove the fan screens to do this procedure. This procedure is applicable for all the fan screens in the equipment cooling system.
 TASK 21-58-15-107-001
 2.  Fan Screens Cleaning
____________________
 A.  Standard Tools and Equipment
 (1)  
Cloth - Dry, lintfree

 (2)  
Vacuum Cleaner - Commercial available

 B.  Consumable Materials
 (1)  
B00058 Solution - Soap and Water

 (2)  
G02216 Clean water

 C.  References
　
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