27-21-00
ALL ú ú 05 Page 544 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
5) Use new tape and make a mark of the rudder position on the tail cone index plate (use the left side of the rudder trailing edge).
6) Move the left RRCM test switch to TEST and do these checks:
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.
a) Make sure the IN TEST light stays on for a maximum of 18 seconds. b) After 30 seconds, make sure all the RRCM faultballs are black. 7) Move the input levers for the top and bottom PCAs fully clockwise at the same time.
NOTE: This is to release unwanted hydraulic pressure and
____ will let the rudder position become stable.
8) Make a mark of the rudder position on the tape
NOTE: Use the left side of the rudder trailing edge.
____
9) Make sure the distance between the two marks (low speed and high speed rudder positions) is less than 0.05 inch
(1.27 mm).
(q) Do the above step again if the distance is more than 0.05 inch
(1.27 mm).
(r) Remove the tape from the tail cone.
S 825-120
(6) Middle PCA - Adjustment
NOTE: Before this procedure is done, make sure the airplane is
____ stable at ambient air temperature |10.0 degrees F (|5.5 degrees C). Before adjustments or adjustment checks are made, make sure the temperature has been stable for at least one hour.
(a)
Move the left RRCM test switch to NORMAL and do these checks: 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.
(b)
Make sure only the left hydraulic system has power
(AMM 29-11-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-21-00
ALL ú ú 05 Page 545 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(c) Do these steps to adjust input rod for the middle PCA: 1) Hold the input levers for the top and bottom PCAs fully clockwise.
NOTE:____ This will remove the unwanted hydraulic pressure from the top and bottom PCAs.
2) 3) 4) Adjust the input rod for the middle PCA until the rudder is approximately 0.50 inch (12.7 mm) to the right of its neutral position.Release the top and bottom input levers.Adjust the input rod for the middle PCA until the rudder trailing edge is in its neutral position (use a tolerance of 0.05 inch (1.27 mm)).
NOTE:____ Make sure you move the rudder from right to left when the adjustment is done.
5) Tighten the jamnuts on the middle PCA input rod and do these checks:
(d) (e) (f) a) Make sure the rudder position does not change. b) Make sure you can see input rod threads in at least one-half of the inspection hole for the input rod.Remove the power from the left hydraulic system (AMM 29-11-00/201).Move the FLT CONTROL SHUTOFF L switch on the P61 panel to OFF. Attach a DO-NOT-OPERATE tag and make sure the switch position light comes ON.Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE tag: 1) 11H17, FLT CONT SHUTOFF TAIL LEFT
WARNING:_______ DO NOT DISCONNECT THE THREE PCA INPUT RODS AT THE SAME
TIME WITH HYDRAULIC POWER ON. THE RUDDER WILL MOVE
QUICKLY TO ITS FULL LEFT POSITION AND CAN CAUSE INJURY TO
PERSONS OR DAMAGE TO EQUIPMENT. 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(12)
