TASK 27-28-00-805-013
 3.  Adjustment - Rudder Position Indicating System______________________________________________
 A. Special Tools and Equipment
 (1)  G12001-50, Rig Pin Kit
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 (2)
MS20392-4C Rig Pin or equivalent diameter rod (0.309-0-311 inch)

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
SSM 27-28-01

 (3)  
WDM 27-28-11

 C.
Access

 (1)  
Location Zone
 324 Vertical Stabilizer Rear Spar to Trailing Edge

 (2)  
Access Panel
 324FL Rudder Components Inspection Access Panel

 D.
Adjust the Rudder Position Indicating System

 S 865-014
 (1)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-016

 (2)  
Set the FLT CONTROL HYD POWER TAIL switches on the P461 Pilots' Overhead Maintenance Panel to SHUTOFF.

 (a)  
Make sure that the four VALVE CLOSED lights come on.

 S 865-017
 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180, DC Power Distribution Panel
 1) 180H8, ELEV/RUD VLV SYS 1
 2) 180E7, ELEV/RUD VLV SYS 2
 3) 180H23, ELEV/RUD VLV SYS 3
 4) 180E22, ELEV/RUD VLV SYS 4

 (4)  
Open the access panel 324FL.

 S 865-019

 (5)  
Set the rudder to the neutral position with the rudder trim knob on the control stand.

 S 015-018
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747-400 MAINTENANCE MANUAL
 S 865-020
 (6)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a) P7, Overhead Circuit Breaker Panel
 1) 7D16, RUD TRIM CONT
 S 495-021
 (7)  Install the rig pin R-4 into the input crank of the rudder feel and
 centering mechanism
 S 495-022
 (8)  Install the rig pin MS20392-4C through the slot in the transmitter
 crank and the inner rig pin hole of the transmitter bracket.
 S 835-023
 (9)  Make sure the applicable rudder position indication on the EICAS
 flight controls maintenance page is 0|0.2 degrees.
 (a) If the indication is out of the tolerance, adjust the control
 rod until it shows 0|0.2 degree.
 (b) If you cannot adjust the control rod to zero, adjust the
 transmitter body in the bracket:
 1) Move the rig pin M520392-4C from the inner to the outer rig
 pin hole of bracket.
 2) Loosen the transmitter clamping screws.
 3) Adjust the transmitter body to zero.
 4) Tighten the transmitter clamping screws.
 a) Make sure you do not turn the transmitter body.
 b) Tighten the transmitter clamping screws to 5-10
 pound-inches.
 5) Do the close adjustment if it is necessary:
 a) Move the rig pin M520392-4C to the inner hole.
 b) Adjust the control rod.
 (c) Install a lockwire to the thumb nut of the control rod.
 S 095-024

 (10) Remove the rig pin MS20392-4C from the transmitter assembly.

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A
747-400 MAINTENANCE MANUAL
 S 095-025
　
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