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data, altitude alert warnings, and localizer and glideslope
deviation warnings.
The DEUs send these data to the display units to show flight
director commands and DFCS status to the crew.
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FDAU
The FCCs send digital data to the FDAU to save in the flight
recorder.
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General
The MCP sends digital data to these components:
* FCC A and B
* DEU 1 and 2
* Ground proximity warning computer (GPWC).
* Autothrottle (A/T)
* SMYD 1 and 2
* FMC.
FCC
When the flight crew selects mode commands and flight path
variables on the MCP, the data goes to the FCCs on a digital
data bus. These are the data that go to the FCCs:
* Selected heading that the crew chose
* Selected course number 1 and 2 that the crew chose
* Altitude window wrap that shows the altitude that the crew
chose
* MCP maintenance discrete to indicate the type of MCP in the
airplane
* MCP discrete to show the modes that the crew chose
* MCP display change to show when a change is made on one
of the MCP controls
* MCP identification to show the type of MCP.
DEU
The MCP sends selected heading and selected course data to
each DEU to show on the display units.
GPWC
The MCP sends the selected course to the GPWC for use by the
envelop modulation function.
MCP Bus 3
The MCP gets data from both FCCs and also a signal to show
which FCC is the master FCC. The MCP then sends all of the
master FCC data out on MCP bus 3 to these systems:
* Autothrottle
* SMYD 1 and 2
* FMC 1
Autothrottle
The MCP sends this data to the Autothrottle:
* Target mach
* Target airspeed
* Selected altitude
* Spoiler 4 position
* Spoiler 9 position
* Flight path angle rate
* AFDS discrete word 1, 2, and 3 which show the DFCS mode
and status.
The Autothrottle uses this data to compute the thrust lever servo
rates for the A/T servo motors.
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SMYD
The MCP sends AFDS discrete word 4 to the SMYDs to show if
either or both autopilots are engaged in the CMD or CWS mode.
FMC
The MCP sends this data to the FMC:
* Selected course number 1 and 2
* selected airspeed
* selected mach
* Selected altitude
* Flap position
* AFDS discrete word 1 and 3 to give DFCS mode and status
* Digital flight control system (DFCS) BITE response.
The FMC uses this data to determine the status and mode of the
DFCS and it also uses this data to show the BITE data.
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MCP
When the flight crew engages either autopilot in command
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