AUTOPILOT SERVOVALVES
Equipment Connections for Elevator Hardover Test
Figure 513
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A
757 MAINTENANCE MANUAL
(q)
Make sure the indicators are always less than one-half the height of an indicator arrow apart when you move the control column.
(r)
Make sure the indicators move down toward the full travel tick mark when the control column is moved full forward.
NOTE: The indicator arrows must go to the full down tick mark
____ on the EICAS display. The indicators must not go more than the full travel tick mark.
(s) Make sure that the indicators move up toward the full travel tick mark on the EICAS display when the control column is moved full aft.
NOTE: The indicator arrows must go to the full up tick mark on
____ the EICAS display. The indicators must not go more than the full travel tick mark.
(t)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel: 1) 11B19 or 11A19, STAB TRIM ALT (IF INSTALLED) 2) 11C12, STAB TRIM SHUTOFF LEFT 3) 11C13, STAB TRIM SHUTOFF RIGHT 4) 11H11 or 11C05, STAB TRIM CONT L 5) 11H20, STAB TRIM CONT R
(u)
Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel to the NORM position.
F.
Operational Test - Elevator System Override
S 215-022
(1)
Make sure that the left, right, and center hydraulic systems are pressurized (AMM 29-11-00/201).
S 865-023
(2)
Hold the first officer's control column in the neutral position and pull the captain's control column aft.
(3)
Make sure that the left elevator moves up.
S 215-024
NOTE: The right elevator will move up a small distance.
____
S 865-025
(4)
Let the captain's control column go to the neutral position.
S 865-026
(5)
Hold the captain's control column in the neutral position and push the first officer's control column forward.
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S 215-027
(6) Make sure that the right elevator moves down.
NOTE: The left elevator will move down a small distance.
____
S 865-028
(7)
Let the first officer's control column go to the neutral position.
G.
Put the Airplane Back To Its Usual Condition
S 865-029
(1)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-030
(2)
Remove the power from the left, right, and center hydraulic systems if it is not necessary (AMM 29-11-00/201).
TASK 27-31-00-825-031
3. Elevator Control System - Adjustment____________________________________
A. General
(1)
SYSTEM ADJUSTMENT SEQUENCE: The procedure contains steps to adjust the components and mechanisms for the elevator control system. The sequence that follows is recommended for complete system adjustment:
(a)
Control Cables: Refer to the "Control Cable Adjustment" paragraph
(b)
Feel and Centering Unit Mechanical Linkage: Refer to the "Adjust the Mechanical Linkage on the Feel and Centering Unit" paragraph
(c)
Neutral Shift Transducers: Refer to the "Neutral Shift Transducer Adjustment" paragraph
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