27-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
(g)
Put tape on the tail cone index plate and make a mark of the rudder position (use the left side of the rudder trailing edge, this is the low speed position).
(h)
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.
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. 3) Make sure you can easily install and remove rig pins R5 and R6 in the ratio changer mechanism.
NOTE: If you cannot install rig pins R5 and R6, do the
____ "Rudder Ratio Changer LVDT - Adjustment" steps (AMM 27-21-00/501).
(i) 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.
(j)
Use the tape on the tail cone and make a mark of the rudder position (use the left side of the rudder trailing edge, this is the high speed position).
(k)
If this mark is less than 0.05 inch (1.27 mm) away from the first mark, do not do the "Rudder Ratio Changer System -Adjustment" group of steps.
(l)
If this mark is more than 0.05 inch (1.27 mm) away from the first mark, do the "Rudder Ratio Changer System - Adjustment" group of steps.
(4)
Rudder Ratio Changer System - Adjustment
S 825-119
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.
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27-21-00
ALL ú ú 04 Page 541 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 745-553
(5)
Move the left RRCM test switch to NORMAL and do these checks:
(a)
Make sure the IN TEST light stays on for a maximum of 18 seconds. 1) After 30 seconds, make sure all the RRCM faultballs are
black.
(b)
Move the input levers for the top and bottom PCA fully clockwise at the same time.
NOTE: This is to release unwanted hydraulic pressure and will
____ let the rudder position become stable.
WARNING: DO NOT DISCONNECT THE TWO INPUT RODS FOR THE RATIO CHANGER
_______ AT THE SAME TIME WITH HYDRAULIC POWER ON. THE RUDDER WILL MOVE QUICKLY TO ITS FULL LEFT POSITION AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(c)
Disconnect the outboard (right) input rod from the ratio changer mechanism (Fig. 506).
(d)
Loosen the jamnuts on the top end of the inboard (left) input rod for the ratio changer.
(e)
Adjust the inboard (left) input rod until the rudder trailing edge is less than 0.05 inch (1.27 mm) away from the second mark (high speed position) on the tape.
NOTE: Make sure the rudder moves from right to left during the
____
adjustment.
Move the top and bottom PCA input levers fully clockwise to release hydraulic pressure if it is necessary. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 2(10)
