To make sure all three AFDCs use data from one MCP processor, all AFDCs use the microprocessor data sent to the master AFDC.
When the left AFDC is master, microprocessor A writes to the LCD displays. The right and center AFDCs receive microprocessor A data through the AFDC cross-channel buses.
When the right AFDC is master, microprocessor B writes to the LCD displays. The left and center AFDCs receive microprocessor B data through the AFDC cross-channel buses.
Training Information Point
If a microprocessor fails or if its interface to the AFDC fails, the MCP sends a request to the CMCF to make an EICAS status message show. The status message is MCP CTRL PANEL LANE.
Fluorescent Tube Control
The fluorescent tube control circuit supplies current to drive the tube and the tube heater.
There is a heater coil around the fluorescent tube. A temperature sensor adjacent to the tube operates the heater when the temperature is less than 40F.
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AFDS -MODE CONTROL PANEL -FUNCTIONAL DESCRIPTION
Liquid Crystal Displays (LCDs) And Control Knob Encoders
There are four LCDs. They show mode reference values. The values change when you turn the selector or when the AFDCs command a new reference value.
Microprocessor A and B drive each LCD. Each selector connects to two encoders. Each encoder sends data to the on-side microprocessor.
Push-Button And Toggle Switches
Each push-button and toggle switch has two sets of contacts. One set connects to microprocessor A and one set connects to microprocessor B. The LED annunciators in the push-button switches also connect to each microprocessor.
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Autopilot (A/P) Engage Switches
Push either switch to engage all available A/P channels. The LEDs in both switches come on.
Autothrottle (A/T) Arm Switches
The switches arm the A/T and digital trimmer control for each engine. Both switches are normally left in the ARM position. When you set the switches to the OFF position, the A/T disconnects.
IAS/MACH Reference Switch
This switch controls the reference the IAS/MACH window shows.
IAS/MACH Window
The window shows indicated airspeed (IAS) or MACH number. IAS shows from 100 to 399 knots in one knot increments. Mach number shows from 0.400 to 0.900 MACH in increments of 0.001 MACH.
At AFDC power up, the window shows 200 knots. The window is normally blank when VNAV is active. If VNAV is not active, the window shows the current target airspeed/mach.
Mode Switches (8)
These switches request A/P, F/D, and A/T modes.
Light Sensor
A photo diode light sensor on the MCP front panel monitors ambient lighting. It controls the brightness of the LCDs.
Heading/Track (HDG/TRK) Reference Switch
This switch controls the reference for the Heading/Track window.
Heading/Track Window
The window shows heading or track angle in increments of one degree. The window range is from 001 to 360 degrees.
At AFDC power-up, the window shows 360 degrees. Runway heading shows at localizer capture.
Vertical Speed/Flight Path Angle (V/S/FPA) Reference Switch
This switch controls the reference for the vertical speed/flight path angle window.
Vertical Speed/Flight Path Angle Window
The vertical speed range is +6000 FPM to -8000 FPM. The flight path angle range is +9.9 degrees to -9.9 degrees.
The window shows four dashes when vertical speed and flight path angle modes are not active.
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Altitude Window
The altitude range is from 0 to 50000 feet. The increment is variable.
The altitude in the window is also the altitude alert value for the caution and warning system. At AFDC power-up the display shows 10000 feet.
Flight Director (F/D) Switches
The F/D switches make the F/D displays show on the primary flight displays (PFDs). When the airplane is on the ground and you move a switch to the ON position, the F/D takeoff (TO) mode indications show on the associated PFD.
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