(2)  
20-10-24/201, Rigging Pins

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

 (4)  
27-21-00/501, Rudder and Rudder Trim Control System

 (5)  
27-21-13/201, Rudder Ratio Changer Actuator

 (6)  
29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-12
 ALL  ú ú 02 Page 211 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 F.  Access
 (1)  
Location Zone
 113 Area Forward of NLG wheel well (Left)
 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
 324CL Rudder Hinge and PCU's

 G.  
Install Rudder Ratio-Changer Mechanism (Fig. 201)

 S 392-033
 (1)  
Apply a thin layer of corrosion preventive compound to the
 ratio-changer bolts and bushings.

 S 432-034

 (2)  
Do these steps to connect the rudder ratio-changer mechanism to its brackets:

 (a)  
Align the ratio-changer mechanism (13) with its brackets (24, 32).

 (b)  
Install the bushing (33) and bolt assembly (26) on the left support bracket (32).

 (c)  
Install the bearing (38), bushing (27), washer (25), and bolt assembly (26) on the right support bracket (24).

 (d)  
Install the inner washers (40) and nuts (28). Tighten the nuts to 50-60 pound-inches (5.7-6.7 newton-meters).

 (e)  
Install the outer washers (39) and nuts (30). Tighten the nuts to 10 pound-inches (1.13 newton-meters).

 NOTE: Be careful not to turn the inner nuts.
____
 (f)  On the left ratio-changer bracket, make sure there is no clearance between the ratio-changer mechanism and the left ratio-changer bracket. If there is clearance, do these steps: 1) Clean the surfaces and apply adhesive to the ratio-changer
 mechanism.
 2)  Bond washers (AN960KD616L) to the ratio-changer mechanism until the clearance is removed.
 3)  Apply pressure to the washer stack, and let the adhesive cure as follows: a) 2 hrs at 160°F b) 3 hrs at 120°F c) 24 hrs at 65°F
 S 432-035
 (3)  
Connect these components:

 (a)  
Connect the control rods (21) from the feel, centering and trim mechanism to the ratio changer.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-12
 ALL  ú ú 02 Page 212 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 (b)  Connect the control rod (2) to the right ratio-changer crank. Use a bolt, washer, and nut as an alternative to the shear pin (4).
 NOTE:  The bolt installation is temporary.
____
 S 432-036
 (4)  Connect the control rod (2) to the summing lever.
 NOTE:  Make sure the grease fittings point in the aft direction when
____
 the rod end bearings are installed.

 S 432-037
 (5)  Connect the pogo (8) to the left ratio-changer crank.
 NOTE:  Make sure the grease fittings point in the aft direction when
____
 the rod end bearings are installed.

 S 432-038
 (6)  
Connect the pogo (8) to the summing lever. Adjust the pogo length until rig pin R7 can be easily installed and removed.

 S 432-039

 (7)  
Do these steps to install the actuator mount (16) and shim (17) to the support:

 NOTE:  If you install new shims, do the task to install the
____ Rudder Ratio Changer Actuator Support Clevis to find the corrrect shim thickness.
 (a)  Apply sealant to the actuator mount (16), and use the washer (14) and nut (15) to install it. Tighten the nut to 90-125 pound-inches (10.2-14.1 newton-meters).
　
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(56)