(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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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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747-400 MAINTENANCE MANUAL
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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