(a)  
Make sure there are no N1 and N2 indications on the EICAS status page for a minimum of 3 minutes.

 S 865-020
 (6)  
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.

 S 865-026

 (7)  
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 <49 APU.

 (f)  
Push the LSK that is adjacent to <49 APU to show the GROUND TESTS menu for the APU.

 NOTE: If the INHIBITED indication is shown above the test
____ prompt, the test will not operate.
 (g)  If the INHIBITED indication shows above the test prompt: 1) Push the LSK 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.
 F. APU Ground Test
 S 745-049
 (1)  
Push the LSK adjacent to the <APU prompt.

 S 745-054

 (2)  
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed.

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

 NOTE: The IN PROGRESS indication is shown during the test.
____
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747-400 MAINTENANCE MANUAL
 S 745-051
 (3)  When the IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <APU.
 NOTE: If a PASS indication is shown, no failures occured during
____
 the test.

 (a)  If FAIL> shows: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG page for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all the CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go to the 49-CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 G.  Put the Airplane in Its Usual Condition
 S 865-029
 (1)
Set the GND TESTS switch on the P461 panel to the NORM position.

 S 865-030

 (2)
Set the STANDBY POWER switch on the P5 panel to the OFF position.

 (3)  
Set the BATTERY switch on the P5 panel to the OFF position.

 S 865-032

 (4)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 865-031
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 AUXILIARY POWER UNIT - INSPECTION/CHECK
_______________________________________
 1. General
_______
 A. This procedure has the task to inspect the APU.
 TASK 49-11-00-206-013
 2. APU Inspection
______________
 A. References
 (1)  
AMM 49-21-07/801, Load Gearbox Front Housing

 B.
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 C.
Prepare for the Inspection

 S 866-023
　
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