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A
747-400 MAINTENANCE MANUAL
 S 865-027
 (3)  
Make sure the central maintenance computer system is serviceable (AMM 45-10-00/201).

 S 865-028

 (4)  
Make sure the flight management computer system is serviceable (AMM 34-61-00/501).

 S 865-029

 (5)  
Make sure the integrated flight display system is serviceable (AMM 31-61-00/501).

 TASK 34-55-00-715-051
 3.  Ground Test - DME System________________________
 A. General
 (1)  
The Ground Test examines the Left and Right DME interrogators. The selection of DME-L or DME-R on the ground tests menu page on the CDU will initiate the Ground Tests. The Ground Test is the same as the Self-Test that can be done from the front panel of DME interrogator.

 (2)  
At the end of the ground test, the test results will be shown on the GROUND TEST MENU.

 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 865-050
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)  
Set the FMC L/R switch to L.

 (3)  
Set the captain's EIU SOURCE SELECT switch to AUTO.

 (4)  
Set the first officer's EIU SOURCE SELECT switch to AUTO.

 S 865-035

 (5)  
Push the STAT button on the EICAS display panel to show the status message page on the auxiliary EICAS display.

 S 865-046

 (6)  
Prepare the CDU for the test:

 S 865-031
 S 865-030
 S 865-034
 (a) Push the MENU key on the CDU to show the MENU.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 (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 <34 NAVIGATION RADIOS.

 (f)  
Push the LSK that is adjacent to <34 NAVIGATION RADIOS to show the GROUND TESTS menu for the navigation radios system.

 (g)  
Push the NEXT PAGE key until you find <DME-L or <DME-R.

 NOTE: If INHIBITED shows above <DME-L or <DME-R, the test will
____
 not operate.

 (h)  If INHIBITED shows above <DME-L or <DME-R: 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.  DME System Ground Test
 S 745-047
 (1)  Push the LSK that is adjacent to the applicable prompt (<DME-L or <DME-R).
 NOTE: IN PROGRESS shows during the test.
____
 S 745-048
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <DME-L or <DME-R.
 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 the 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 865-049
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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