The indication for the rudder manual trim cancel switch signal is in the L1 column. The indication shows as YES if the switch is pushed or NO if released. If the switch signal is invalid, the indication shows FAULT in amber.
The indication for the rudder trim armed signal is in the R column. The indication shows as YES if armed and NO if not armed. If the armed signal is invalid, the indication shows FAULT in amber.
The rudder trim rate signal is in the R column. The indication shows FAST or SLOW dependent on the condition. If the trim rate signal is invalid, the indication shows FAULT in amber.
The rudder trim direction is in the L1 column. The indication shows LEFT or RIGHT dependent on the rudder direction command. The indication shows NO if there is no rudder trim command. The indication shows L&R in amber if the trim command is for both directions at the same time. The indication shows FAULT in amber if the trim signal is not valid.
The rudder trim brake released indication is in the R column. The indication shows YES when the brake is released or NO when it is not. If the signal is not valid, the field is blank.
The pitch trim arm and control signal indications show in these columns:
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PFCS -INDICATIONS -MAINTENANCE PAGE -ANALOG DISCRETES
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L1 for captain arm
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C for captain control
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L2 for first officer arm
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R for first officer control.
The indication shows UP or DOWN depending on which direction the pilot moves the trim switches. The indication shows NO if the pilot does not move the trim switches. The indication shows UP&DN in amber if the switches signal both up and down commands. If the signal is not valid, the field is blank.
The indication for the STCM brake release pressure is in the C and R columns. The indication shows YES if the brake is released or NO if it is not. If the signal is not valid, the field is blank.
The indication for the STCM hydraulic shutoff relay power is in the C and R columns. The indication shows YES if the relay has power or NO if it does not. If the signal is not valid, the field is blank.
The auto speedbrake limit switch signal is on the L1 column. The indication shows YES if the auto speedbrake actuator is in the retracted position. It shows NO if the actuator is not retracted. If the signal is not valid, the field is blank.
The TAC switch position signal shows in the C column. The signal can be OFF or AUTO. If the signal is not valid, the field becomes blank.
AIMS Discrete Indications
The AIMS monitors the alternate pitch trim lever arm and control switches for activity and direction. The indication in the ACTIVE columns shows YES when the pilot makes a lever command or NO when there is no command. If the signal is not valid, the indication shows FAULT in amber.
The indication in the DIRECTION column shows UP or DOWN dependent on the direction of the alternate pitch trim command. If the signal is not valid, the indication shows FAULT in amber.
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PFCS -INDICATIONS -MAINTENANCE PAGE -ANALOG DISCRETES
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777 AIRCRAFT MAINTENANCE MANUAL
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PFCS -SYSTEM TESTS
General
The PFCs control the operation of the MAT tests. There are 54 system tests for the PFCS.
These are the tests:
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Actuator Confidence
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Actuator Control Electronics Monitors
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Air/Ground System to PFC Interface
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Alternate Pitch Trim Levers
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Column Force Transducer
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Column Position
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Elevator Feel System
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Flap/Slat Electronics Unit Interface to ACE
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Flap/Slat Electronics Unit to PFC Interface
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Gust Suppression Pressure Transducers
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Left Aileron Actuator Confidence
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Left Aileron Alignment
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Left Aileron Position
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Left Elevator Actuator Confidence
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Left Elevator Alignment
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Left Elevator Oscillation Monitor
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Left Elevator Position
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Left Flaperon Actuator Confidence
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Left Flaperon Alignment
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Left Flaperon Position
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Modal Suppression Accelerometer
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Pedal Position
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PFC Disconnect Switch
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