S 865-188
(1)
Hold the captain's control wheel in its neutral position.
S 215-189
(2)
Turn the first officer's control wheel fully clockwise, then counterclockwise, and release.
(a)
Do these checks: 1) Make sure the right aileron operates when you turn the control wheel.
2) Make sure the control wheel moves smoothly and does not need too much force.
S 865-190
(3)
Hold the first officer's control wheel in its neutral position.
S 215-191
(4)
Turn the captain's control wheel fully clockwise, then
counterclockwise, and release.
(a)
Do these checks: 1) Make sure the left aileron operates when you turn the control wheel.
2) Make sure the control wheel moves smoothly and does not need too much force.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 865-192
(5) Remove electrical power if it is not necessary (Ref 24-22-00/201).
TASK 27-11-00-715-193
6. Single Hydraulic System Aileron Control - Test______________________________________________
NOTE: This is a scheduled maintenance task.
____
A. References
(1)
24-22-00/201, Electrical Power - Control
(2)
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems
B.
Prepare for the Test
S 865-194
(1)
Supply electrical power (Ref 24-22-00/201).
S 215-195
(2)
Make sure these circuit breakers on the overhead panel, P11, are closed:
(a)
EICAS (6 locations)
S 865-196
(3) Push the STATUS switch on the display select panel, P9, to show the aileron position indicator on the bottom EICAS display.
S 865-197
WARNING: TO PREVENT INJURY OR DAMAGE, MOVE ALL PERSONS AND EQUIPMENT
_______ AWAY FROM THE CONTROL SURFACES BEFORE HYDRAULIC POWER IS SUPPLIED. STAY AWAY FROM THE CONTROL SURFACES DURING THEIR OPERATION.
(4)
Supply pressure to the left, right, and center hydraulic systems (Ref 29-11-00/201).
C.
Single Hydraulic System Aileron Control - Test
S 865-198
(1) Remove the power from the center and right hydraulic systems (Ref 29-11-00/201).
NOTE: If an aileron does not have power, it can move down a small
____ distance. This condition is not unusual.
The aileron surface can move up when the control wheel is turned. This is because of the breakout of the wing override mechanism, and the aileron PCU summing lever which moves the rod ends then the PCU control valve bottoms.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-11-00
ALL ú ú 02 Page 536 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 215-200
(2) Turn the captain's control wheel fully clockwise and do these
checks:
(a) Make sure the right aileron moves up.
(b) Make sure the left aileron does not move.
S 215-201
(3) Turn the control wheel fully counterclockwise and do these checks:
NOTE: You may experience an increase in the resistance near the____
end of the control wheel travel. This is because of the
tension in the override mechanism.
(a) Make sure the right aileron moves down.
(b) Make sure the left aileron does not move.
S 865-202
(4) Remove the power from the left hydraulic system (Ref 29-11-00/201).
S 865-203
(5) Supply pressure to the center hydraulic system only
(Ref 29-11-00/201).
S 215-204
(6) Turn the control wheel fully clockwise and do these checks:
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