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MAINTENANCE MANUAL
S 865-192
(2)
Align the left, center and right IRUs in the NAV mode
(AMM 34-21-00/201).
S 865-195
(3)
Prepare the upper yaw damper or lower yaw damper for the test:
(a) Push and release the engage switch of the upper (or lower) yaw damper on the P5 panel to engage the upper (or lower) yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.
S 865-196
(4)
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.
S 865-197
(5)
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 LSK that is adjacent to <22 YAW DAMPER to show the GROUND TESTS menu for the yaw damper system.
(f)
If INHIBITED shows above <UPPER YDM TEST or <LOWER YDM TEST: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU (Push the NEXT PAGE key to
see the subsequence pages). 3) Push the LSK that is adjacent to <RETURN to show the ground test menu again.
F. Yaw Damper Ground Test
S 745-198
(1) Push the LSK that is adjacent to the applicable prompt (<UPPER YDM TEST or <LOWER YDM TEST).
(a) Make sure that the INOP annunciator of the upper (or lower) yaw damper on the P5 panel comes on then goes off.
NOTE: The INOP annunciator can come on and then go off two
____ or three times because of the YDM BITE test. The INOP annunciator will go off permanently in less than 15 seconds.
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747-400 MAINTENANCE MANUAL
NOTE: IN PROGRESS shows during the test.
____
S 745-199
(2) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <UPPER YDM TEST or <LOWER YDM TEST.
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.
G. Put the Airplane Back to Its Usual Condition
S 865-200
(1)
Set the GND TESTS switch to the NORM position.
S 865-201
(2)
Push and release the engage switch of the upper (or lower) yaw damper on the P5 panel to disengage the yaw damper system.
S 865-202
(3)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
S 865-204
(4)
Set all the mode selector switches on the IRS control panel (P5) to the OFF position if it is not necessary (AMM 34-21-00/201).
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