757
MAINTENANCE MANUAL
S 864-005
WARNING:_______ KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER,
FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED
SURFACES. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR
WHEN HYDRAULIC POWER IS SUPPLIED.
(4)
Pressurize the right hydraulic system (Ref 29-11-00).
S 864-006
(5)
Move the horizontal stabilizer until Dimension B on the stabilizer ballscrew actuator is 15.89 | 0.01 inches
(40.36 | 0.025 centimeters) (6 units of trim) (Fig. 401).
S 864-007
(6)
Remove the pressure from the right hydraulic system (Ref 29-11-00).
S 864-008
(7)
Put the L, R, and C FLT CONTROL SHUTOFF switches on the right side panel, P61, to the OFF position.
S 864-009
(8)
Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the control stand panel, P10, to the CUTOUT position.
S 864-010
(9)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11B19, STAB TRIM ALT (IF INSTALLED)
(b)
11C12, STAB TRIM SHUTOFF LEFT
(c)
11C13, STAB TRIM SHUTOFF RIGHT
(d)
11H11 or 11C05, STAB TRIM CONT L
(e)
11H17, FLT CONT SHUTOFF TAIL LEFT
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A
757 MAINTENANCE MANUAL
(f)
11H18, FLT CONT SHUTOFF TAIL CTR
(g)
11H20, STAB TRIM CONT R
(h)
11H28, FLT CONT SHUTOFF TAIL RIGHT
E.
Remove the Torque Box
S 494-011
(1)
Attach identification tags on the captain's and the first officer's elevator control cables (Ref 27-00-01) (Fig. 402).
S 034-012
(2)
Disconnect the captain's and the first officer's elevator control cables from the aft quadrants (Ref 27-00-01).
S 034-013
(3)
Disconnect the decentering springs from the elevator feel unit.
NOTE: The force of the installed spring is 100 pounds
____
(445 newtons).
S 034-014
(4)
Remove the two connecting rods that are between the elevator feel unit and the aft quadrant flanges.
S 034-015
(5)
Remove the two connecting rods that are between the elevator feel unit and the neutral shift mechanism.
S 034-016
(6)
Remove the three connecting rods that are between the autopilot pitch control servos (APCS) and the aft quadrant flanges.
S 034-017
(7)
Remove the APCS from the torque box assembly (3 locations)
(Ref 22-12-01).
S 034-018
(8)
Disconnect the APCS hydraulic lines for access to remove the torque box, if it is necessary.
(9)
Remove the neutral shift and override mechanism (Ref 27-31-21).
(10)
Remove the elevator feel unit (Ref 27-31-17)
S 034-019
S 034-020
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A
757 MAINTENANCE MANUAL
S 034-021
(11) Remove the two grounding springs on the aft side of the neutral shift and override mechanism.
NOTE: The force of each installed spring is 125 pounds
____
(556 newtons).
S 034-022
(12)
Remove the first officer's aft quadrant (Ref 27-31-15)
S 034-023
(13)
Remove the aft quadrant indexer (Fig. 403).
S 034-024
(14)
Remove the captain's aft quadrant (Ref 27-31-15).
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