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2) Install the spacers [17] between the neutral shift mechanism [1] and support brackets.
a) Add or remove spacers [17], if necessary.
(b) Install the bolts [2], washers [3] (under the nuts), and nuts [4] to attach the left side of the
neutral shift mechanism [1] to the left support bracket.
(c) Install the bolts [11], washers [12] (under the nuts), and nuts [13] to attach the right side of
the neutral shift mechanism [1] to the right support bracket.
WARNING: MAKE SURE YOU TURN THE CRANK OF THE NEUTRAL SHIFT MECHANISM IN
THE UP DIRECTION. IF YOU INSTALL THE CRANK INCORRECTLY, THE
STABILIZER CAN MOVE QUICKLY WHEN YOU ENGAGE THE AUTOPILOT. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(d) Make sure the crank of the neutral shift mechanism [1] is in the up direction and connected
to the mach trim actuator.
1) Install the bolt [6] from the left to the right side (bolt head on the left side).
2) Install the washers [7] (under the nut) and nut [8].
a) Tighten the nut [8] to 85-100 pound-inches (9.6-11.3 newton-meters).
CAUTION: DO NOT TIGHTEN THE NUT [10] AGAIN AFTER YOU TIGHTEN THE NUT
[8]. YOU CAN CAUSE DAMAGE TO THE BOLT ASSEMBLY.
3) Install the washer [9] and nut [10].
a) Tighten the nut [10] to 30-35 pound-inches (3.4-3.9 newton-meters).
(e) Connect the controls rods [27] and control rods [23] to the neutral shift mechanism [1].
1) Install the bolts [25], washers [24], washers [26], and nuts [28].
SUBTASK 27-31-91-080-001
(3) Remove the rig pin E-5 of the rig pin kit, SPL-1585 from the aft control quadrant.
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SUBTASK 27-31-91-860-003
(4) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 2 C00849 AFCS STABILIZER TRIM
C 4 C00456 AFCS SYS A MACH TRIM AC
D 1 C01049 AFCS SYS A WARN LIGHT (BAT)
D 2 C01045 AFCS SYS A FCC DC
D 3 C01048 AFCS SYS A ENGAGE INTLK
D 4 C00457 AFCS SYS A MACH TRIM DC
D 5 C01044 AFCS MCP DC 1
F/O Electrical System Panel, P6-2
Row Col Number Name
B 1 C00374 AFCS SYS B WARN LIGHT (BAT)
B 2 C01064 AFCS SYS B MACH TRIM DC
B 3 C01046 AFCS SYS B FCC DC
B 4 C00716 AFCS SYS B ENGAGE INTLK
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
C 1 C01037 AFCS SYS B MACH TRIM AC
C 2 C01042 AFCS SYS B SNSR EXC AC
C 3 C01047 AFCS MCP DC 2
D 10 C00840 FLIGHT CONTROL STAB TRIM ACTUATOR
SUBTASK 27-31-91-080-002
(5) Remove the lock, SPL-1672 from the stabilizer trim wheel (Figure 402).
SUBTASK 27-31-91-860-004
(6) Do this task: Put the Elevator Systems A and B Back to the Condition Before the Pressure
Removal, TASK 27-31-00-840-802.
SUBTASK 27-31-91-820-001
(7) Adjust the neutral shift mechanism. To adjust it, do this task: Input Rods of the Elevator Neutral
Shift Mechanism and Output Rod of the Feel and Centering Unit - Adjustment,
TASK 27-31-00-820-804.
SUBTASK 27-31-91-730-001
(8) Do this task: Neutral Shift - Test, TASK 27-31-00-700-810.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-31-91-410-001
(1) Install this access panel:
Number Name/Location
318BR Tailcone Access Door
SUBTASK 27-31-91-410-002
(2) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
------------------------- END OF TASK ---------------------------
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ELEVATOR NEUTRAL SHIFT MECHANISM - INSPECTION/CHECK
1. General
A. This procedure contains this task:
(1) Elevator Neutral Shift Mechanism Inspection
(a) This task supplies the data for a dimensional inspection of the elevator neutral shift
mechanism.
(b) This task does not remove or install the elevator neutral shift mechanism, refer to the
Elevator Neutral Shift Mechanism - Removal/Installation for procedures to remove and
install the elevator neutral shift mechanism.
TASK 27-31-91-200-801
2. Elevator Neutral Shift Mechanism - Inspection
(Figure 601)
A. General
(1) This procedure gives wear limits and repair data for the elevator neutral shift mechanism.
B. References
Reference Title
27-31-91-000-801 Elevator Neutral Shift Mechanism Removal (P/B 401)
27-31-91-400-801 Elevator Neutral Shift Mechanism Installation (P/B 401)
C. Tools/Equipment
Reference Description
　
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