S 866-078
(5)
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 866-082
(6)
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
S 486-057
WARNING: INSTALL RIG PINS A3 AND A4 TO PREVENT MOVEMENT OF THE AILERONS
_______ DURING THE FREEPLAY MEASUREMENT. THE AILERONS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(7)
Install rig pins A3 and A4 in the aileron quadrant as shown
(Fig. 601).
F.
Aileron Freeplay - Check
S 866-058
WARNING: THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND
_______ THE STABLILIZER ARE FULLY POWERED SURFACES. MAKE SURE THAT ALL EQUIPMENT AND PERSONS ARE AWAY FROM THE CONTROL SURFACES BEFORE YOU SUPPLY THE HYDRAULIC POWER. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(1)
Do the applicable group of steps to supply hydraulic power to one of the two aileron PCAs:
(a)
Do this step to supply power to the outboard PCA for the left aileron: 1) Supply pressure to the right hydraulic system only
(Ref 29-11-00/201).
(b)
Do this step to supply hydraulic power to the outboard PCA for the right aileron: 1) Supply pressure to the left hydraulic system only
(Ref 29-11-00/201).
(c)
Do this step to supply hydraulic power to the inboard PCAs for the two ailerons: 1) Supply pressure to the center hydraulic system only
(Ref 29-11-00/201).
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27-02-00
ALL ú ú 01 Page 615 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 226-060
CAUTION:_______ USE SUFFICIENT PADDING ON THE FORCE SCALE TO PREVENT DAMAGE TO
THE AILERON SURFACE. USE A PAD THAT IS AT LEAST 5 INCHES
(12.7 cm) LONG AND HAS A WIDTH OF AT LEAST 5 INCHES (12.7 cm).
(2) Use the force scale to apply a 10-14 pound force (44.5-62.2 newtons) to the bottom of the aileron. Center this force between the PCAs and 2 inches (50.8 mm) forward of the aileron trailing edge.
S 496-093
CAUTION: USE A DIAL INDICATOR WITH AT LEAST A 1-INCH STROKE TO PREVENT
_______ DAMAGE TO THE INDICATOR.
(3)
Do the steps that follow to attach the dial indicator to the top wing structure just outboard of the aileron, or to attach a scale vertically on the fixed structure adjacent to the aileron lower trailing edge.
(a)
Use a double face tape and a steel plate to attach the magnetic base to the top wing structure outboard of the aileron.
(b)
Use adjustable rods to attach the dial indicator to the fixed rod of the magnetic base.
(c)
Put the indicator plunger near the aileron trailing edge.
(d)
Give a load to the dial indicator until the needle moves to approximately mid-travel.
(e)
Adjust the dial indicator to zero.
(f)
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 (pointing to the adjacent fixed surface) to the aileron lower trailing edge with tape.
2) Attach the scale to the fixed surface adjacent to the aileron lower trailing edge with double face tape, and continue after dial indicator instructions given below.
NOTE: Set the aileron neutral position point on the scale
____ with pointer installed on aileron lower trailing edge when attaching the scale.
S 866-121
(4)
Remove the force from the bottom of the aileron.
S 226-061
(5)
Use the force scale to apply a 10-14 pound force (44.5-62.2 newtons) to the top of the aileron. Center this force between the PCAs and 2 inches (50.8 mm) forward of the aileron trailing edge.
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