(d)  
Install the turnbuckle locking clips on the cables.

 (4)  
Install the crank and the coupling.

 S 434-015
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747-400
MAINTENANCE MANUAL

A
A
ACTUATOR END
ROD INPUT
LOCATION FOR RIG PIN SB-3
FLIGHT CAM
DETENT
ROLLER FWD
A-A
Rig Pin SB-3 Location Figure 402
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747-400 MAINTENANCE MANUAL
 S 414-016
 (5)  Do this task: "Speed Brake Sequence Mechanism Installation" (Ref 27-62-06/401).
 S 094-017
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  Do this task: "Wing Landing Gear Door Lock Installation" (Ref 32-00-30/201).
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 1.

2.

3.

4.

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747-400 MAINTENANCE MANUAL
 SPOILER POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
General (Fig. 1)
_______
 A.  The spoiler position indicating system provides visual indication on the flight deck of the angular position of the No. 4 and No. 12 spoilers. The spoiler position indicators appear on the EICAS status page as part of the surface position display.
 B.  Components used by the spoiler position indicating system are the two spoiler position transmitters, the spoiler/aileron surface position digitizer card, and the EIU's and EICAS display. The system is powered by 28 volts dc from the 28 vdc bus 4 and by 28 volts ac from the 28 vac bus 4 through circuit breakers on the P6 panel.
Spoiler Position Transmitter
____________________________
 A.  The spoiler position transmitters are located on the wing rear spar at the No. 4 and No. 12 spoilers. An adjustable control rod attaches each transmitter crank to the spoiler. With the spoiler in the down position, the control rod can be adjusted to set the spoiler position readout on the EICAS flight controls maintenance page to zero.
Surface Position Digitizer
__________________________
 A.  The forward surface position digitizer card YMLA17 receives the signals from the spoiler position transmitters and converts the signals to a serial digital format for transmission to the EIU's on an ARINC 429 bus.
Operation (Figs. 2 and 3)
_________
 A.  Functional Description
 (1)  
As the spoiler is deflected upwards from its down 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 spoiler 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 spoiler angular displacement as numeric readouts for system adjustment and trouble shooting.

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