(g)  If INHIBITED shows above <CPCS-A or <CPCS-B: 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.
 E. Cabin Pressure Control System (CPCS) Ground Test
 S 745-100
 WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE CLEAR OF THE OUTFLOW VALVES
_______ DURING THIS TEST. THE OUTFLOW VALVES WILL MOVE DURING THIS TEST AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Push the LSK that is adjacent to <CPCS-A or <CPCS-B.
 (a)  
When the TEST PRECONDITIONS pages shows, make sure each instruction on the page is completed.

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

 NOTE: IN PROGRESS shows during the test.
____
 S 745-086
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <CPCS-A or <CPCS-B.
 NOTE: If PASS shows, no failures occurred during the test.
____
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 S 745-087
 (3)  If FAIL> shows:
 (a)  
Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG page for the failure.

 (b)  
Push the NEXT PAGE key until you find all the GROUND TEST MSG pages.

 (c)  
Make a list of all the CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.

 (d)  
Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.

 F. Put the Airplane in its Usual Condition
 S 865-095
 (1)  Remove the electrical power, if it is not necessary
 (AMM 24-22-00/201).

 TASK 21-31-00-705-098
 3.  Overboard Valve System Ground Test__________________________________
 A. General
 (1)  The ground test for the overboard valve system commands the forward overboard valve to close then fully open. If the valve does not move to its commanded position, the test fails.
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Prepare for the Test
 S 865-089
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-097

 (2)  
Make sure the MAN-L and MAN-R switch-lights, on the overhead panel, P5, are in the off positions.

 S 865-090

 (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 LSK that is adjacent to <AIR CONDITIONING to show the GROUND TESTS for the air conditioning system.

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 (f) Push the NEXT PAGE key until you find <OVBD VALVE SYSTEM.
 NOTE: If INHIBITED shows above <OVBD VALVE SYSTEM, the
____
 test will not operate.

 (g)  If INHIBITED shows above <OVBD VALVE SYSTEM: 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.
 E. Overboard Valve System Ground Test
 S 745-091
 (1)  Push the LSK that is adjacent to <OVBD VALVE SYSTEM.
　
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