(13)
 Operate the control lever for the speed brake.

 (a)
Make sure the cables move freely through the seals.

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747-400 MAINTENANCE MANUAL
 S 414-075
 (14) Do this task: "Floor Panel Installation" (AMM 53-21-02/401).
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747-400 MAINTENANCE MANUAL
 CONTROL WHEEL, CONTROL COLUMN, RUDDER PEDAL, AND SPEED BRAKE
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 LEVER POSITION INDICATION - DESCRIPTION AND OPERATION

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General
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 A.  The position of the aileron control wheel, elevator control column, and rudder pedals is sensed by position transmitters for display on the EICAS flight controls maintenance page and for use by the flight data recorder system (Ref 31-31-00). The electrical signal from the position transmitters is processed by the column/rudder pedal position digitizer card for transmission to the EIU's.
 B.  The position of the speed brake control lever is sensed by a triple RVDT transmitter for use by the autopilot/flight director system (Ref 22-10-00), which also sends the position information to the flight data recorder system (Ref 31-31-00). The electrical outputs of the position transmitter are processed by the three flight control computers.
Control Wheel Position Transmitter (Fig. 1)
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 A.  CONTROL WHEEL POSITION TRANSMITTER WITH DIRECT DRIVE DESIGN; the control wheel position transmitter is located below the captain's aileron drum assembly. The transmitter contains a synchro transducer. Rotation of the aileron drum is transferred to the position transmitter shaft. The transmitter is adjusted to zero the WHEEL readout on the EICAS flight controls maintenance page when the control wheel is in the neutral position.
 B.  CONTROL WHEEL POSITION TRANSMITTER WITH NEGATOR SPRING DESIGN; the control wheel position transmitter is located next to the captain's aileron drum assembly below the flight deck. The transmitter contains a synchro transducer. Rotation of the aileron drum is transferred to the position transmitter shaft through a flat negator spring. The transmitter is adjusted to zero the WHEEL readout on the EICAS flight controls maintenance page when the control wheel is in the neutral position.
Control Column Position Transmitter (Fig. 1)
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 A.  The control column position transmitter is located at the left end of the elevator torque tube below the captain's control column. The transmitter contains a synchro transducer. Movement of the torque tube is transferred to the position transmitter shaft through a short actuator shaft. The transmitter is adjusted to zero the COLUMN readout on the EICAS flight controls maintenance page when the control column is in the neutral position.
Rudder Pedal Position Transmitter (Fig. 1)
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 A.  The rudder pedal position transmitter is located in front of the rudder right forward quadrant near the first officer's rudder pedals. The transmitter contains a synchro transducer. Movement of the rudder pedals is transferred to the position transmitter shaft through a crank and a control rod attached to the rudder forward quadrant. The transmitter is adjusted to zero the PEDAL readout on the EICAS flight controls maintenance page when the rudder pedals are in the neutral position.
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747-400
　
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