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lamps give backlight to the three position LCD display. These
lamps and the LCDs are not LRUs.
There are 52 incandescent lamps for the light plate. These
lamps are also not LRUs.
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General
These are the major components of the mode control panel
(MCP):
* ARINC 429 bus selector
* Channel A and B processors
* LCD indicators and controls
* Mode selector and A/P engage switches
* A/T switch and indicator
* A/P switches and indicators
* light sensors.
ARINC 429 Bus Selector
When an FCC becomes the master FCC and takes control of the
MCP displays, it sends an MCP bus select signal to the MCP.
The ARINC 429 bus selector then sends that FCC’s data to the
channel A processor and on to the FMC and the A/T. The MCP
always uses the FCC A data unless the FCC B sends a bus
select signal and the FCC A did not.
Channels A and B Processors
The MCP contains two separate microprocessors; a channel A
processor and a channel B processor.
The channel A processor receives FCC data from the bus
selector. The channel A processor does most of the MCP
functions. The data then goes to the FCC A and to the channel B
processor.
The channel B processor replaces the course 1 select data with
the course 2 select data. The processor then sends all of the
data on to the FCC B.
The channel B processor receives signals from the light
sensors. The signals control the brightness of the LCD
backlights and the mode selector switch LEDs.
The channel B processor calculates the A/P warning signal and
sends it to the captain’s and first officer’s autoflight status
annunciators (ASA).
Mode Selector and Toggle Switches
These switches send data to the channel A processor:
* F/D toggle switches
* A/P engage switches
* Mode selector switches.
The processor sends the A/P engage and mode select signals
to the FCC. The FCC makes sure that all necessary conditions
are satisfactory before it engages the A/P or selects the mode.
Mode Selector and Light Annunciators
The channel A processor receives engagement and mode
select data from the FCC that has control. The processor then
lights these annunciators:
* F/D master light LEDs
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* A/P engage switch LEDs
* Mode selector switch LEDs.
LCDs and Selectors
The channel A processor receives data from these selectors. It
then sends the data to the LCD display:
* Course 1 and 2 selectors
* Altitude selector
* Heading selector.
The channel A processor receives data from the IAS/MACH and
vertical speed selectors and sends this data to the FCC. The
FCC calculates the correct IAS/MACH and vertical speed and
sends it to the MCP to show on their displays.
Autopilot Engage Logic
The engage enable signals, high and low, come from the FCCs.
When the crew selects an autopilot mode, the MCP sends one of
these engage signals to the FCCs:
* CWS only
* CMD only
* CWS and CMD.
The MCP also sends a signal that shows if the flight directors
are on.
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