27-02-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 826-030
(4)
Operate the rudder trim switch on the aft electronic control panel, P8, until the rudder trim indicator shows zero units of trim.
(a)
Make sure the rudder is in its neutral position.
S 866-031
(5)
Remove the power from the left hydraulic system (Ref 29-11-00/201).
S 866-032
(6)
Move the FLT CONTROL SHUTOFF L, R, and C switches on the right side panel, P61, to OFF. Attach DO-NOT-OPERATE tags and make sure the switch position lights come on.
S 866-033
(7)
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
F.
Rudder Freeplay - Check
S 866-101
WARNING:_______THE RUDDER IS A FULLY POWERED SURFACE. MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE CONTROL SURFACE BEFORE YOU SUPPLY HYDRAULIC POWER. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Do the applicable group of steps to supply hydraulic power to one of the three PCAs for the rudder (do only the steps for the PCA you want to supply the power to):
NOTE: Measure the freeplay for each of the three PCAs that move the
____ rudder. During the measurement, make sure only one of the three rudder PCAs has power at a time.
(a) Do these steps to supply hydraulic power to the bottom PCA: 1) Supply pressure to the center hydraulic system only (Ref 29-11-00/201).
2) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P11 panel: a) 11H18, FLT CONT SHUTOFF TAIL CTR
3) Remove the DO-NOT-OPERATE tag and move the FLT CONTROL SHUTOFF C switch on the P61 panel to ON.
(b) Do these steps to supply hydraulic power to the middle PCA: 1) Supply pressure to the left hydraulic system only (Ref 29-11-00/201).
2) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P11 panel: a) 11H17, FLT CONT SHUTOFF TAIL LEFT
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ALL ú ú 01 Page 609 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
3) Remove the DO-NOT-OPERATE tag and move the FLT CONTROL SHUTOFF L switch on the P61 panel to ON.
(c) Do these steps to supply hydraulic power to the top PCA: 1) Supply power to the right hydraulic system only (Ref 29-11-00/201).
2) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P11 panel: a) 11H28, FLT CONT SHUTOFF TAIL RIGHT
3) Remove the DO-NOT-OPERATE tag and move the FLT CONTROL SHUTOFF R switch on the P61 panel to ON.
S 486-098
WARNING: DO NOT MOVE THE RUDDER PEDALS DURING THE RUDDER FREEPLAY
_______ MEASUREMENT. THE RUDDER MOVES VERY QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Do the steps that follow to attach the dial indicator or a scale (ruler with 0.001 or 0.010 inch (0.025 or 0.254 mm) increments) against one side of the rudder (dial indicator) or next to the rudder lower trailing edge (scale):
(a)
Use double face tape and a steel plate to attach the magnetic base just aft of the rudder trailing edge.
(b)
Use adjustable rods to attach the dial indicator to the fixed rod of the magnetic base.
(c)
If you do not have a dial indicator or mounting accesories available, you can use a scale with 0.001 or 0.010 inch (0.025 or 0.254 mm) increments with the steps that follow: 1) Attach a pointer longitudinally to the rudder lower
trailing edge with tape.
2) Attach the scale to the tail cone surface horizontally to the rudder lower trailing edge with double face tape, and continue after indicator instructions given below.
NOTE: Set the rudder neutral position point on the scale
____ with pointer installed on rudder lower trailing edge when attaching the scale.
(d)
Put the indicator plunger approximately 1.0 inch (25.4 mm) forward of the trailing edge and 1.0 inch (25.4 mm) above the bottom edge.
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