27-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 2)  Set the GND test switch on the overhead maintenance panel, P461, to the ENABLE position.
 3)  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 <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. g) Find the <RUD RATIO EXTEND prompt.
 NOTE:____If INHIBITED shows above <RUD RATIO EXTEND. The test will not operate.
 h)  If INHIBITED shows above <RUD RATIO EXTEND, do the steps that follow:
 -Push the LSK that is adjacent to the test prompt.
 -Do the steps shown on the CDU.
 -Push the LSK that is adjacent to <RETURN to show the ground test menu again.
 (b)  Do the rudder ratio changer actuator extend procedure. 1) Push the LSK that is adjacent to the <RUD RATIO EXTEND prompt.
 2)  When the the test preconditions page shows, make sure each instruction on the page is done (push the next page key to see subsequent pages).
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ RUDDER AND AILERONS. THE RUDDER AND AILERONS CAN MOVE DURING THIS TEST IF HYDRAULIC POWER IS SUPPLIED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 3)  Push the LSK that is adjacent to START TEST>.
 NOTE:____IN PROGRESS shows during the test. The upper and lower rudder ratio actuators will remain extended until this test is stopped.
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 27-21-00
 ALL  ú ú 01 Page 525 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 735-161
 WARNING:_______ MAKE SURE THE FLAPS ARE RETRACTED.  IF THE FLAPS ARE NOT
 RETRACTED, THEY CAN MOVE WHEN YOU PRESSURIZE THE
 PITOT-STATIC SYSTEM.  THIS CAN CAUSE INJURY TO PERSONS OR
 DAMAGE TO EQUIPMENT.

 (14)
 Procedure 2 (airplanes with any combination of SRM part numbers installed), supply a 3.37 - 3.52 psig pressure (363 - 371 knots) to the pitot port of the top right and the top left pitot probes (AMM 34-11-00/201).

 (a)  
If the upper rudder moved more than 0.06 inch, adjust the input rod for the rudder ratio changer. Adjust the input rod until the rudder moves less than 0.06 inch.

 S 835-139
 (15)
 Do these steps to adjust the input rod for the rudder ratio changer of the upper rudder (Fig. 504, and 505).

 (a)  
Install rig pin R-4 in the feel, centering, and trim mechanism.

 (b)  
Make sure rig pin E-1 is installed (Fig. 501).

 (c)  
If the rudder moved in a right direction when you pressurized the pitot system, make the input rod shorter. If the rudder moved in a left direction when you pressurized the pitot system, make the input rod longer.

 (d)  
Large adjustment: 1) Loosen the clamp bolt on the input rod.

 NOTE: This is at the feel, centering, and trim mechansim
____ end of the input rod.
 2) Disconnect the input rod from the output crank of the feel, centering, and trim mechanism. 3) Turn the rod end or the knurled adjuster nut.
 NOTE: One full turn of the rod end and the knurled
____ adjuster nut together is equivalent to 2.1 inches of travel at the rudder trailing edge. One full turn of the rod end (when the knurled adjuster nut does not move) is equivalent to 1.6 inches of travel at the rudder trailing edge.
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