757 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 2(6)

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 (6) Remove rig pin R3.
 S 865-616
 (7) Move the Left RRCM test switch to NORMAL.
 S 865-408
 (8) Remove the power from the left hydraulic system (AMM 29-11-00/201).
 S 865-409
 (9) Move the L FLT CONTROL SHUTOFF switch on the P61 panel to OFF.
 Install a DO-NOT-OPERATE tag and make sure the switch position light
 comes ON.
 S 865-410
 (10) Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE
 tag:
 (a) 11H17, FLT CONT SHUTOFF TAIL LEFT
 I.  Rudder Ratio Changer LVDT - Adjustment (Fig. 506)
 ú
 ú  S 495-090
 ú  (1) Turn the rudder trim switch on the aft electronic control panel P8
 ú  until rig pin R3 (for the feel, centering, and trim mechanism) can
 ú  be easily installed.
 S 865-009
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN_______
 HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER,
 FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED
 SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR
 WHEN HYDRAULIC POWER IS SUPPLIED.
 (2) Supply pressure to the left hydraulic system (AMM 29-11-00/201).

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 S 865-091
 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P11 panel: (a) 11H17, FLT CONT SHUTOFF TAIL LEFT
 S 865-092
 (4)  Remove the DO-NOT-OPERATE tag and move the FLT CONTROL SHUTOFF switch L on the P61 panel to ON.
 S 865-415
 (5)  Do these steps to extend the rudder ratio changer actuator: (a) Move the left RRCM test switch on the E3 equipment shelf to TEST.
 NOTE:____ The amber RUDDER RATIO light on the P5 panel will come ON and stay ON. An amber RUDDER RATIO message will come into view on EICAS when the RRCM test switch is in
 its TEST position.
 1)  Make sure the IN TEST light stays on for a maximum of 18 seconds.
 2)  After 30 seconds, make sure all the RRCM faultballs are black.
 S 825-397
 (6)  AIRPLANES WITH THE -2 LVDT; Loosen the LVDT adjustment nut and adjust the LVDT until rig pins R5 and R6 can be easily installed at the same time. (a) If rig pin R5 cannot be installed easily, adjust the RRCA support clevis shims (AMM 27-21-12/201). (b) If rig pin R6 cannot be installed easily with rig pin R5 in place, adjust the interconnect rod.
 S 825-398
 (7)  AIRPLANES WITH THE -3 LVDT; Turn the barrel of the LVDT to adjust the LVDT until rig pins R5 and R6 can be easily installed at the same time. (a) If rig pin R5 cannot be installed easily, adjust the RRCA support clevis shims (AMM 27-21-12/201). (b) If rig pin R6 cannot be installed easily with rig pin R5 in place, adjust the interconnect rod.
 S 865-399
 (8)  Do these steps to make sure the rudder ratio changer actuator is fully extended. (a) Remove rig pins R5 and R6. (b) Put the RRCM to the TEST position. (c) Measure and write down the actuator extension length. (d) Adjust the LVDT to fully extend the RRCA.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 (e)  
When the RRCA is at full stroke (at its maximuim extension), measure and write down the actuator extension length.

 (f)  
Compare the first actuator extension measurement with the second actuator extension measurement. 1) The greater actuator extension measurement must be 0.02 -

0.04 inches (0.5-1.0 mm) more than the first actuator extension measurement.
 2)  If it is necessary, Add or remove shims until the greater actuator extension measurement is 0/02 - 0.04 inches (0.5-1.0 mm) more than the small actuator extension measurement.
 (g)  Do the step (6) or (7) again to adjust the LVDT.
　
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