(a)
Make sure a RUD PCU MON message does not come into view on the bottom EICAS display.
S 735-061
(5)
Do the yaw damper system test procedure (AMM 22-21-00/501).
I.
Put the Airplane Back to Its Usual Condition
S 215-006
CAUTION: IF THE RRCM TEST SWITCH IS NOT MOVED TO "NORMAL", THE AMBER
_______ "RUDDER RATIO" LIGHT WILL COME ON. IF THIS LIGHT IS ON, THE AIRPLANE CANNOT BE DISPATCHED.
(1)
Make sure the RRCM test switches are in their NORMAL positions.
S 865-062
(2)
Remove the power from the left, right, and center hydraulic systems (AMM 29-11-00/201).
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-063
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757 MAINTENANCE MANUAL
TASK 27-21-00-825-064
3. Adjustment - Rudder and Rudder Trim Control System__________________________________________________
A. General
(1) SYSTEM ADJUSTMENT SEQUENCE . This task adjusts the rudder control system and its components in the sequence that follows. This sequence is recommended for a complete system adjustment:
~...................................................................... | ADJUSTMENT | COMPONENT/MECHANISM | ........................................................................ | F | Control Cables RA and RB | ........................................................................ | G | Rudder Pedals and Jackshafts | ........................................................................ | H | Rudder Ratio Changer Actuator (RRCA) | ........................................................................ | I | Rudder Ratio Changer LVDT | ........................................................................ | J | Rudder Thermal Compensating Linkage | ........................................................................ | K | Yaw Damper Pogo | ........................................................................ | L and M | Rudder Ratio Changer and Power Control | | | Actuators (PCA) | ........................................................................ | N | Autopilot Rollout Guidance Servos | ........................................................................ | O | Rudder Position Transmitter | ........................................................................ | P | Rudder Trim Indicator | 2..................…...................................................1
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757 MAINTENANCE MANUAL
(2) OUT OF SEQUENCE ADJUSTMENTS - It is possible to adjust some components in a different sequence. You must do some other adjustments before the component adjustment and some adjustments after it is done. The necessary adjustments are as follows:
~....................................................................... | | COMPONENT YOU | ADJUSTMENTS | ADJUSTMENTS| | | WILL ADJUST | YOU MUST | YOU MUST | | ADJUSTMENT | OUT-OF-SEQUENCE | DO BEFORE | DO AFTER | ......................................................................... | F | Control Cables RA and | NONE | NONE | | | RB | | | ......................................................................... | G | Rudder Pedals and | NONE | NONE | | | Jackshafts | | | ......................................................................... | H | Rudder Ratio Changer | NONE | NONE | | | Actuator | | | ......................................................................... | I | Rudder Ratio Changer | NONE | NONE | | | LVDT | | | ......................................................................... | J | Rudder Thermal | NONE | NONE | | | Compensating Linkage | | | ......................................................................... | K | Yaw Damper Pogo | NONE | NONE | ......................................................................... | L and M | Rudder Ratio Changer | G,I *[1] | NONE | | | and PCAs | | | ......................................................................... | N | Autopilot Rollout | NONE | NONE | | | Guidance Servos | | | ......................................................................... | O | Rudder Position | F,G,I,L | NONE | | | Transmitter | | | ......................................................................... | P | Rudder Trim Indicator | F,G,I,L | NONE | 2...............…........................…................….............1 *[1] It is not necressary to do this adjustment if you did not disturb
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