FLIGHT COMPARTMENT -CAPTAIN/FIRST OFFICER SEAT -INTRODUCTION

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777 AIRCRAFT MAINTENANCE MANUAL

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FLIGHT COMPARTMENT -CAPTAIN/FIRST OFFICER SEAT -OPERATION

Headrest
Pull up or push down on the headrest to adjust the vertical position. Move the headrest cushion to the right and turn it to adjust the headrest angle. The angle adjustment has eight positions.
Recline
To increase the recline angle, pull up and hold the recline control then push aft on the seat back. Release the control to lock the seat back in the new position.
To decrease the recline angle, pull up and hold the recline control. Let the seat back move toward the upright position. Release the control to lock the seat back in the new position.
Lumbar Support
The back cushion has a built in lumbar support. Turn the left lumbar support control to move the back cushion up or down. Turn the right lumbar support control to move the back cushion forward or aft.
Armrests
Adjustment knobs are under the forward end of the armrests. Turn the knob to move the armrest up or down.
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The armrests fold to a vertical position for entry and exit. Lift up on the front of the armrest to fold it up. When the armrest is folded up as far as it will go, you can push it in toward the center of the seat.
Thigh Pads
Turn the thigh pad control to lift or lower the thigh pad.
Horizontal Adjustment
Hold the horizontal control switch in the forward position to move the seat inboard and forward. The seat stops automatically when it is all the way forward. Hold the switch in the aft position to move the seat aft and outboard. The seat stops automatically when it is all the way outboard.
If the power adjustment fails, adjust the horizontal position of the seat manually. Pull up and hold the horizontal movement manual override. This disengages the electric actuator from the track. Move the seat to the desired position. Release the manual override to lock the seat in the new position. Stops on the seat tracks keep the horizontal movement to a limit.
Vertical Adjustment
Hold the vertical control switch in the up position to move the seat up. The seat stops automatically when it is all the way up. Hold the switch in the down position to move the seat down. The seat stops automatically when it is all the way down.
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FLIGHT COMPARTMENT -CAPTAIN/FIRST OFFICER SEAT -OPERATION

If the power adjustment fails, adjust the vertical position of the seat manually. Move some of your weight off the seat then pull up and hold the vertical movement manual override. This disengages the electric actuator. Move the seat to the desired position. Release the manual override to lock the seat in the new position. Internal stops keep the vertical movement to a limit.
Emergency Stop
If the seat continues to move when you release an adjustment switch, use the emergency stop switch.
Inertia Reel Lock
The inertia reel lock has positions for lock and unlock.
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FLIGHT COMPARTMENT -CAPTAIN/FIRST OFFICER SEAT -OPERATION

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FLIGHT COMPARTMENT -CAPTAIN/FIRST OFFICER SEAT -FUNCTIONAL DESCRIPTION

General
The left utility bus supplies 115v ac three phase power to the circuits. The vertical and horizontal control circuits are similar. Phase-switching relays control the direction of the motors. An emergency switch lets you stop the motors if the normal control circuits fail.
The circuits for the captain and first officer seats are similar except for the power source; power for the first officer seat comes from the right utility bus.
Up Operation
Phase C supplies power to the UP/DOWN switch. When you hold the switch in the UP position, power goes through the motor thermal protectors and the emergency switch to the power relay. The relay energizes and supplies three phase power to the up and down relays.
Another set of contacts in the UP/DOWN switch permits power to go through the up limit switch and the down relay to energize the up relay. Three phase power operates the vertical motor to move the seat up. When the seat is up as far as it will go, the up limit switch opens and removes power from the up relay coil. The relay de-energizes and removes power from the motor.
Down Operation
When you hold the switch in the DOWN position, power goes through the motor thermal protectors and the emergency switch to the power relay. The relay energizes and supplies three phase power to the up and down relays.
　
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