(b)  
Turn the left and right ratio-changer output cranks from their high speed (cranks in) position to their low speed (cranks out) position. Make sure the output cranks move freely.

 (c)  
Turn the left output crank and install rig pin R5.

 NOTE:  Because of the spring load, rig pin R5 will fit tightly. You can use the handle - output arm tool, B27045-5, to turn the output crank.

 (d)  
Connect the actuator (1) rod end to the left output crank. 1) Install the bolt, bushing, washer and nut.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-12
 ALL  ú ú 02 Page 213 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 2)  Align the actuator (1) until the anti-rotation clevis is engaged.
 (e)  Connect the actuator (1) to the actuator mount (16). 1) Make sure the actuator mount is aligned with the ratio changer actuator (1). 2) Make sure the bolt that connects the ratio-changer
 actuator (1) to the actuator mount (16) fits freely. 3) If the bolt does not fit correctly, install or remove shims
 (17)
 from behind the actuator mount.

 (f)  
Make sure that rig pin R6 can be easily installed. If rig pin R6 cannot be easily installed, adjust the interconnect rod as necessary.

 (g)  
Remove rig pins R5 and R6.

 S 432-040
 (8)  
Connect the LVDT electrical connectors (38) to the LVDT (7).

 S 432-041

 (9)  
Install the lockwire on the LVDT connectors (38).

 S 422-042

 (10)
 Complete the installation of the ratio-changer actuator and do the applicable ajustment/test procedure (Ref 27-21-13).

 S 822-043

 (11)
 Adjust the rudder ratio-changer mechanism (Ref 27-21-00).

 S 092-002

 (12)
 Remove rig pins R3 and R4.

 S 822-044

 (13)
 Move the left and right ratio-changer output cranks to their high speed position and do this check:

 (a)
Make sure that rig pins R5 and R6 can be easily installed and removed. Adjust the interconnect rod if it is necessary.

 S 492-045
 (14)
 Install rig pin R6.

 (15)
 Do these steps to test the primary control rod operation:

 S 712-046
 NOTE: The nut which holds the control rod is a temporary
____ connection. The shear pin will be installed after you check the operation of the control rod.
 (a)  
Turn the aft quadrant to its full clockwise position and hold it there.

 (b)  
Do a check on the primary control rod for the ratio-changer. Make sure the bearings are free to move and that there is some clearance around the nuts.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-12
 ALL  ú ú 03 Page 214 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 (c)  
Turn the aft quadrant to its full counterclockwise position and hold it there.

 (d)  
Do a check on the primary control rod for the ratio-changer. Make sure the bearings are free to move and that there is some clearance around the nuts.

 (e)  
Release the aft quadrant.

 (f)  
Remove rig pin R6 and let the output cranks go to the low speed position.

 S 712-001
 (16)
 Do the above step again to examine primary control rod operation with the output cranks in the low speed position.

 S 422-050

 (17)
 Remove the bolt, washer, and nut that temporarily hold the primary control rod to the right ratio-changer output crank. Use the installation procedure below to install the shear pin (4).

 S 222-051

 (18)
 Do a test on the rudder ratio-changer mechanism (see below).

 H.
Install the Shear Pin in the Ratio-Changer Mechanism (Fig. 204)

　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 2(57)