(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 <27 RUDDER RATIO.
(f)
Push the LSK that is adjacent to <27 RUDDER RATIO to show the GROUND TESTS menu for the rudder ratio changer.
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(g) Find the <RUD RATIO ACTR prompt.
NOTE: If INHIBITED shows above <RUD RATIO ACTR, the test will
____
not operate.
(h) If INHIBITED shows above <RUD RATIO ACTR: 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. Rudder Ratio Changer Ground Test
S 745-148
(1)
Push the LSK that is adjacent to the <RUD RATIO ACTR prompt.
(a)
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed. (Push the NEXT PAGE key to see the subsequent pages.)
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ RUDDER, AILERONS AND THE TRAILING EDGE FLAPS. THE RUDDER AND AILERONS CAN MOVE DURING THIS TEST IF HYDRAULIC POWER IS SUPPLIED. THE TRAILING EDGE FLAPS CAN ALSO MOVE AUTOMATICALLY DURING THE TEST. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(b) Push the LSK that is adjacent to START TEST>.
NOTE: IN PROGRESS shows during the test.
____
S 745-149
(2) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <RUD RATIO ACTR.
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) Open and close these circuit breakers on the P7 panel:
NOTE: This is to make sure the right SRM controls the
____
actuators.
a) FLT CONT ELEC 2L AC (C10263)
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b) FLT CONT ELEC 2LDC (C10264) c) FLT CONT ELEC 1LAC (C8782) d) FLT CONT ELEC 1LDC (C8783)
5) Do the rudder ratio ground test a second time.
NOTE: Do not open and close the FLT CONT ELEC 2RAC and the
____ FLT CONT ELEC 2RDC circuit breakers when you do the rudder ratio ground test a second time.
6) Go to the CMCS message index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
NOTE: For CMC messages 27110, 27111, 27210 and 27211, the
____ information that follows applies: If both SRM's show a failed actuator, use the FIM corrective action. However, if only one SRM shows a failed actuator, repair the rudder ratio command wiring from that SRM to the actuator.
F. Procedure 2: (Airplanes with any combination of SRM part numbers installed)
S 865-159
(1)
Supply electrical power (AMM 24-22-00/201).
S 745-160
(2)
Look for existing faults in the rudder ratio changer system
(AMM 45-10-00/201).
(a)
Select <EXISTING FAULTS from the CMC main menu.
(b)
Select <27 RUDDER RATIO from the existing faults menu.
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