E.  If you tow the airplane, or move it with its power, open the ACARS AC circuit breaker. The MU will transmit the OUT time if you do not remove the AC power.
 TASK 23-27-00-715-023
 2.  Operational Test - Aircraft Communications Addressing and Reporting System
__________________________________________________________________________
 A.  Prepare for the Operational Test
 S 865-024
 (1)  Connect the VHF-1 antenna cable to the VHF-3 transceiver at electronic equipment rack E-2.
 NOTE: Change the antenna cables only if the RF path is blocked.
____
 S 765-069
 (2)  Supply electrical power (Ref 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
 S 865-025
 (3)  Make sure that these circuit breakers are closed:
 (a)  On the left load control center, P18: 1) ACARS MU AC 2) ACARS MU DC
 B. Procedure
 S 715-026
 (1)  
Make sure the MU FAIL and CU FAIL lights are not on.

 S 715-072

 (2)  
Do an ACARS self test:

 (a)  
Push the line select key (LSK) adjacent to MENU until the ACARS MAIN MENU shows on the IDU.

 (b)  
Push the LSK adjacent to MISCELLANEOUS.

 (c)  
Push the LSK adjacent to ACARS STATUS.

 (d)  
Push the LSK adjacent to SYSTEM STATUS.

 (e)  
Make sure the MU shows OK.

 (f)  
Make sure the IDU shows OK.

 (g)  
Make sure the PRINTER shows OK.

 TASK 23-27-00-735-028
 3.  System Test - Aircraft Communications Addressing and Reporting System_____________________________________________________________________
 A. Prepare for the Test
 S 865-029
 (1)  Connect the VHF-1 antenna cable to the VHF-3 transceiver at electronic equipment rack E-2.
 NOTE: Change the antenna cable only if the RF path is blocked.
____
 S 865-030
 (2)  Supply electrical power (Ref 24-22-00/201).
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 S 865-031
 (3)  
Make sure the parking brake is set.

 S 865-032

 (4)  
Make sure the forward entry door is open.

 S 865-033

 (5)
Make sure that these circuit breakers are closed:

 (a)  On the left load control center, P18: 1) ACARS MU AC 2) ACARS MU DC
 B. Procedure
 S 715-073
 (1)  Do an ACARS self test:
 (a)  
Push the line select key (LSK) adjacent to MENU until the ACARS MAIN MENU shows on the IDU.

 (b)  
Push the LSK adjacent to MISCELLANEOUS.

 (c)  
Push the LSK adjacent to ACARS STATUS.

 (d)  
Push the LSK adjacent to SYSTEM STATUS.

 (e)  
Make sure the MU shows OK.

 (f)  
Make sure the IDU shows OK.

 (g)  
Make sure the PRINTER shows OK.

 S 735-074
 (2)  Do a pre-flight initialization.
 (a)  
Push the LSK adjacent to MENU until the ACARS MAIN MENU shows on the IDU.

 (b)  
Push the LSK adjacent to PRE-FLIGHT.

 (c)  
Push the LSK adjacent to INITIALIZATION.

 (d)  
Put in a FLT NO.
 1) Push the correct numbers for your flight number.
 2) Push ENT.

 (e)  
Put in the current DAY.

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