(2)  
Access Panels
 561AB Aileron Quadrant (Left)
 661AB Aileron Quadrant (Right)

 E.
Install Aileron Position Transmitter (Fig. 401)

 S 124-015
 (1)  
Use a rotary bonding brush or a rotary abrasive disk to clean and prepare the transmitter and bracket mating surfaces (Ref 20-10-22). Make sure to get a good electrical bond.

 S 434-016

 (2)  
Install the transmitter in its bracket. Install the screws in the bracket but do not tighten them.

 NOTE: Make sure that the screw that is nearest the transmitter
____ shaft is in the transmitter body groove (Fig. 401).
 S 824-017
 (3)  
Install the screw, washer and nut that hold the crank on the transmitter shaft. Do the checks that follow:

 (a)  
Make sure that the slot in the crank is aligned with the zero index mark on the transmitter shaft (Fig. 401).

 (b)  
Make sure that the screw is in the transmitter shaft groove. Tighten the nut.

 S 824-018
 (4)  
Keep the crank aligned with the index mark and install the transmitter bracket at 84 to 86 degrees to the crank (View A-A). Tighten the screws.

 S 224-019

 (5)  
Make sure that the resistance between the bracket and the
 transmitter is not more than 0.0025 ohms.

 (6)  
Apply the tamperproof putty.

 S 824-021

 (7)  
Align the transmitter bracket with the mounting bracket and the crank with the transmitter control rod.

 S 434-020
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-18-01
 ALL  ú ú 02 Page 404 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 434-022
 (8)  
Install the bolts, washers, and nuts that attach the transmitter bracket to the mounting bracket. Tighten the nut to 30-35 pound-inches.

 S 434-023

 (9)  
Install the screw, washer, and nut that connect the crank to the control rod. Tighten the nut to 5-10 pound-inches (0.6-1.1 Nm).

 S 824-024

 (10)
 Adjust the aileron position transmitter (Ref 27-18-00).

 F.
Put the Airplane Back to its Usual Condition

 S 864-025
 (1)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead panel, P11:

 (a)  
11J14, AILERON POS LEFT

 (b)  
11J22 or 11J23, AILERON POS RIGHT

 S 094-002
 WARNING:_______USE AMM 32-00-15/201 TO REMOVE THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Remove the door locks from the landing gear doors and close the doors (Ref 32-00-15).

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

 (4)
Close access panel 561AB (left) or 661AB (right) (Ref 06-44-00).

 S 864-026
 S 414-027
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-18-01
 ALL  ú ú 01 Page 405 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 RUDDER AND RUDDER TRIM CONTROL SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________________________
 1.  General_______
 A.  The rudder and rudder trim control system provides directional control and stability around the vertical axis. This section provides a detailed description of the rudder control system components and their operation. Tail hydraulic shutoff valve description and operation is found in Section 27-23-00. Rudder position indication system description and operation is found in Section 27-28-00.
 B.  Description and operation of the rudder ratio changer modules (RRCMs) is covered in the following paragraphs. Removal and installation of the modules is covered in 27-09-00/201.
　
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