S 014-005
(4)
Open the access door for the neutral shift and override mechanism, 313AL (Ref 06-42-00).
S 864-006
(5)
Move the horizontal stabilizer until Dimension B on the stabilizer ballscrew actuator is 15.89 | 0.01 inches
(403.6 +/- 0.25 mm) (Fig. 401).
S 864-007
(6)
Remove the pressure from the right and center hydraulic systems (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)
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757 MAINTENANCE MANUAL
(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
(f)
11H18, FLT CONT SHUTOFF TAIL CTR
(g)
11H20, STAB TRIM CONT R
(h)
11H28, FLT CONT SHUTOFF TAIL RIGHT
E.
Remove the Neutral Shift and Override Mechanism (Fig. 402)
S 494-011
(1)
Install rig pin E/ST7 in the aft quadrants.
S 494-012
(2)
Install rig pin E/ST10 in the neutral shift housing.
S 034-013
(3)
Disconnect the two control rods that connect the neutral shift mechanism to the feel and centering unit.
NOTE: Do not change the adjustment of the control rods.
____
S 034-014
(4)
Remove the three fasteners that connect the neutral shift link to the neutral shift mechanism at the stabilizer input lever.
S 034-015
(5)
Remove the two grounding springs that connect the neutral shift mechanism to the torque box bracket on the elevator aft mechanism.
NOTE: Each spring has a force of 150 pounds (667 newtons).
____
S 034-016
(6)
Remove the four fasteners that attach the neutral shift mechanism to the torque box of the elevator aft mechanism.
(7)
Remove the neutral shift and override mechanism.
S 024-017
TASK 27-31-21-424-018
3. Install the Neutral Shift and Override Mechanism________________________________________________
A. References
(1)
06-42-00/201, Empennage Access Doors and Panels
(2)
24-22-00/201, Electrical Power - Control
(3)
27-31-00/501, Elevator Control System
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MAINTENANCE MANUAL
B. Access
(1)
Location Zones
211/212 Control Cabin
311/312 Area Aft of Pressure Bulkhead to BS 1787.45
313/314 Stabilizer Center Section Compartment
(2)
Access Panels
311AL Forward Stabilizer Compartment
313AL Elevator Neutral Shift and Override Mechanism
C.
Install the Neutral Shift and Override Mechanism (Fig. 402)
S 434-019
(1)
Install the four fasteners to attach the neutral shift mechanism to the torque box for the elevator aft mechanism.
S 434-020
(2)
Install the two grounding springs between the neutral shift mechanism and the torque box for the elevator aft mechanism.
S 434-021
(3)
Install the three fasteners to connect the neutral shift link to the neutral shift mechanism at the stabilizer input lever.
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