(4)  
Make sure the hydraulic connections at the shutoff valve do not have leaks.

 F.
Put the Airplane Back to Its Usual Condition

 S 414-027
 (1)  
Close the access door 312A (Ref 06-09-05/201).

 S 864-028

 (2)  
Fill the hydraulic reservoirs (Ref 12-12-01/301).

 S 864-029

 (3)
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-23-01
 ALL  ú ú 01 Page 406 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

4.

5.

A
747-400 MAINTENANCE MANUAL
 RUDDER POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
General
_______
 A.  The rudder position indicating system provides visual indication on the flight deck of upper and lower rudder angular displacement. The rudder position indicators appear on the EICAS status page as part of the surface position display.
 B.  Components used by the rudder position indicating system are the upper and the lower rudder position transmitters, the rudder/elevator surface position digitizer circuit card, and the EIU's and EICAS display. The system is powered by 28 volts dc from the 28 vdc bus 3 and by 28 volts ac from the 28 vac bus 3 through circuit breakers on the P6 panel.
 C.  A separate electrical indication system drives the rudder trim position pointer on the aileron/rudder trim control module in the flight compartment.
Rudder Position Transmitter
___________________________
 A.  The rudder position transmitters are located between each rudder and the vertical stabilizer rear bulkhead. An adjustable control rod attaches the transmitter to the rudder. With the rudder in the neutral position, the control rod can be adjusted to set the rudder position readout on the EICAS flight controls maintenance page to zero.
Surface Position Digitizer
___________________________
 A.  The aft surface position digitizer circuit card YM5A001 receives the signals from the rudder position transmitters and converts the signals to a serial digital format for transmission to the EIU's on an ARINC 429 bus. The card is located in the SPD card file M8011 in the E8 aft electrical equipment rack.
Rudder Trim Position Indication
_______________________________
 A.  Flight deck indication of rudder trim is provided by the rudder trim indicator on the P8 pilots' control stand. The indicator contains a motor-driven tape pointer and a circuit card. The indicator receives rudder trim position information from an RVDT in the rudder trim actuator (Ref 27-21-00).
Operation (Figs. 2 and 3)
_________
 A.  Functional Description
 (1)  
When the rudder is deflected from the neutral position, the attached control rod drives the transmitter crank which pivots the transmitter shaft. The transmitter electrical output varies as the shaft pivots. The output signal passes to the surface position digitizer which processes the signal and routes it to the EIU's for display on EICAS.

 B.  
Control

 (1)  
Operation of the rudder position indicating system is automatic. The EICAS surface position display appears when the EICAS status page is invoked.

 (2)  
The flight controls maintenance page may be called up on the auxiliary EICAS display. This page displays the values of rudder angular displacement as numeric readouts for system adjustment and trouble shooting.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-28-00
 ALL  ú ú 01 Page 1 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

RUDDER POSITION INDICATION ON AUXILIARY EICAS DISPLAY
SEE B
RUDDER TRIM INDICATION
ON AILERON AND RUDDER
TRIM CONTROL MODULE

SEE A
RUDDER TRIM INDICATOR
UPPER RUDDER
RUDDER TRIM
105 0 510

NOSE LEFT UNITS NOSE RIGHT
AILERON
NOSE
NOSE
LEFT

R
RIGHT
　
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