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A
757
MAINTENANCE MANUAL
S 862-081
CAUTION:_______ AVOID RUDDER SURFACE TRAVEL TO THE EXTREME FAR LEFT PRIOR TO OR
DURING RUDDER ADJUSTMENT. FULL LEFT TRAVEL OF THE RUDDER
BEFORE RIGGING COMPLETION RESULTS IN FULL RETRACTION OF THE
PCA'S. THIS MAY CAUSE SURFACE CONTACT BETWEEN THE RUDDER
LEADING EDGE AND A PCA.
(6) Move the rudder pedals to their full right position and do these steps:
CAUTION: INSTALL THE AFT QUADRANT LOCKOUT TOOL BEFORE THE PCA
_______ LOCKOUT TOOL. STRUCTURAL DAMAGE CAN OCCUR IF THE TWO TOOLS ARE NOT USED TOGETHER AND IN THE CORRECT SEQUENCE.
(a)
Install the aft quadrant lockout tool (Fig. 203).
(b)
Release the rudder pedals.
S 862-008
(7) Remove the power from the left, right, and center hydraulic systems (Ref 29-11-00).
S 492-009
WARNING: DO NOT INSTALL THE PCA LOCKOUT TOOL WHEN HYDRAULIC PRESSURE IS
_______ SUPPLIED. THE RUDDER CAN MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(8)
On a PCA where maintenance is not necessary, immediately install the PCA lockout tool (Fig. 203).
S 862-010
(9)
Remove the pressure from the hydraulic system that supplies the PCA you will remove (Ref 29-11-00).
NOTE: The right system supplies the top PCA.
____ The left system supplies the middle PCA. The center system supplies the bottom PCA.
S 492-011
(10) Move the towing lever on the metering valve module to the tow position and install the towing lever lockpin in the nose gear (Fig. 202).
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MAINTENANCE MANUAL
S 862-013
(11)
Move the FLT CONTROL SHUTOFF switches L, C, and R on the right side panel, P61, to OFF. Attach DO-NOT-OPERATE tags and make sure the amber switch position legend lights come ON.
S 862-014
(12)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11H17, FLT CONT SHUTOFF TAIL LEFT
(b)
11H18, FLT CONT SHUTOFF TAIL CTR
(c)
11H28, FLT CONT SHUTOFF TAIL RIGHT
(d)
11J10, PCU MON SENSOR
(e)
11J11, PCU MON MOD
F.
Remove the PCA (Fig. 201)
S 032-015
(1)
Disconnect these components:
(a)
The input rod (18) that is connected between the actuator shearout lever (17) and the torque tube (1)
NOTE: Do not remove the shearout lever from the PCA.
____
(b)
The electrical connector (25) from the rudder PCA monitor sensor (24)
(c)
The hydraulic lines (2) from the actuator (12) and do this step: 1) Seal the hydraulic lines with caps.
S 032-016
(2)
Remove these components:
(a)
The bolts (5) that connect the actuator (12) and reaction link (3) rod ends to the rudder front spar (4)
(b)
The two bolts (20) nearest the access panel that hold the actuator (12) to the trunnion block (19).
S 822-017
(3)
Do these steps to compress the actuator:
(a)
Make sure the actuator return port does not have a cap installed.
(b)
Turn the shearout lever (17) in a counterclockwise direction to remove unwanted hydraulic pressure.
(c)
Compress the actuator.
NOTE: It is possible to use 90 pounds (400 newtons) of force
____ when the actuator is compressed.
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