757
MAINTENANCE MANUAL

 S 212-038
 (8)  
Turn the rudder trim switch on the P8 panel to its full right position and hold it there until the rudder movement stops. Do these checks:

 (a)  
Make sure the rudder trim indicator shows at least 15.2 units of right rudder trim.

 (b)  
Make sure the rudder position indicator moves right to a position that is approximately two-thirds of full scale.

 S 212-039
 (9)  
Turn the rudder trim switch on the P8 panel to its full left position and hold it there until the rudder movement stops. Do these checks:

 (a)  
Make sure the rudder trim indicator shows at least 15.2 units of left rudder trim.

 (b)  
Make sure the rudder position indicator moves left to a position that is approximately two-thirds of full scale.

 S 212-040
 (10)
 Move the rudder trim switch to zero units of trim and do this check:

 (a)  
Make sure the rudder goes back to its neutral position.

 S 212-060
 (11)
 Do the test of the Captain's Rudder Pedal Force (AMM 27-21-00/501).

 K.
Put the Airplane Back to Its Usual Condition

 S 092-048
 WARNING: STAY AWAY FROM THE NOSE WHEELS WHEN THE LOCKPIN IS REMOVED.
_______ THE WHEELS CAN TURN TO THE CENTER POSITION QUICKLY, AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Make sure the nose wheels are in their center position and remove the towing lever lockpin from the nose gear (Fig. 204).

 S 862-041

 (2)  
Remove the power from the left, right, and center hydraulic systems (Ref 29-11-00).

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

 (4)  
Close access panels 324AL and 324CL (Ref 06-42-00).

 (5)  
Close access door 311AL, if necessary (Ref 06-42-00).

 S 862-042
 S 412-043
 S 412-046
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 27-21-06
 ALL  ú ú 01 Page 215 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 RUDDER RATIO CHANGER MECHANISM - MAINTENANCE PRACTICES
______________________________________________________
 1.  General_______
 A.  This procedure contains six tasks. The first task contains the data that is necessary to remove the rudder ratio-changer mechanism and its components. The second task supplies the data that is necessary to install the rudder ratio-changer and its components. The third task contains the data that is necessary to remove the ratio-changer LVDT. The fourth task contains the data that is necessary to install the ratio-changer LVDT. The fifth task contains the data necessary to remove the support clevis of the rudder ratio-changer. The sixth taxk contains the data necessary to install the support clevis of the rudder ratio-changer.
 TASK 27-21-12-022-011
 2.  Remove Rudder Ratio-Changer Mechanism and Components____________________________________________________
 A.  General
 (1)  This task contains two procedures, one to remove the rudder ratio-changer mechanism, and one to remove the ratio-changer shear pin. Because this task contains two procedures, only the applicable group of steps must be done.
 To start one of these procedures, do the "Prepare for Removal" group of steps. Then, do the group of steps that is necessary to remove the component.
 B.  Equipment
 (1)  
Rig Pins from Set B20003-XX (Ref 20-10-24):

 (a)  
R3 - P/N B20003-16

 (b)  
R4 - P/N B20003-19

 (2)  
Nose Gear Towing Lever Lockpin - A09003-1

 C.  
References

 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
20-10-24/201, Rigging Pins

 (3)  
24-22-00/201, Electrical Power - Control

 (4)  
27-21-13/201, Rudder Ratio Changer Actuator

 (5)  
29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 D.  
Access

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

 (2)  
Access Panels
 324AL Body to Fin Seal
 324BL Aft Side of Rear Spar and Rudder Hinge
　
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