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

 (f)  
Push the LSK that is adjacent to <21 AIR CONDITIONING to show the GROUND TESTS menu for the air conditioning system.

 (g)  
Push the NEXT PAGE key until you find <PTC-A/ALL PACKS .

 NOTE: If INHIBITED shows above <PTC-A/ALL PACKS,
____
 the test will not operate.

 (h)  If INHIBITED shows above <PTC-A/ALL PACKS: 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 864-038
 (4)  Push the LSK that is adjacent to <PTC-A/ALL PACKS.
 (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.
____
 S 714-039
 (5)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <PTC-A/ALL PACKS.
 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.
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 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 864-040
 (1)  
Set the GND TESTS switch to the NORM position.

 S 414-018

 (2)  
Close the access panel 192MR on the air conditioning equipment bay (AMM 06-09-03/201).

 S 864-041

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 21-28-10-004-019
 4.  Aft Cargo Air Conditioning Flow Regulating Valve Removal________________________________________________________
 A. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AMM 09-11-00/201, Towing

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
SSM 21-28-08

 (5)  
WDM 21-28-51

 B. Access
 (1)  Location Zone
 136 Wing Landing Gear Well, RH

 C. Prepare for Removal
 S 864-020
 (1) Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a)  Main Power Distribution Panel, P6
 1) 6E36, FWD LWR A/C CONT CARGO

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