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control panel (MCP).
The MCP sends this data to the FMCS:
* Local selected course
* Foreign selected course
* Selected altitude
* Trailing edge flap position
* DFCS mode discretes
* DFCS BITE response
* Selected airspeed
* Selected mach.
The FMCS uses the selected course data in the navigation subfunction.
The selected altitude and trailing edge flap position
are used in the performance and guidance sub-functions. The
mode discretes show VNAV/LNAV switch position, TO/GA
switch position, and system status.
A/T
The autothrottle computer sends A/T BITE response to the
FMCS.
ADIRU
The ADIRUs send this inertial reference (IR) data to the FMCS:
* Present position Latitude
* Present position Longitude
* Ground speed
* True heading
* Magnetic heading
* Pitch angle
* Roll angle
* Inertial altitude
* Inertial vertical speed
* N-S velocity
* E-W velocity.
The ADIRUs send this air data reference (ADR) data to the
FMCS:
* Uncorrected barometric altitude
* Baro corrected altitude
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* Mach
* Computed airspeed
* True airspeed
* Total air temperature
* Static air temperature.
The FMCS uses this data to calculate these functions:
* Aircraft position (latitude, longitude and altitude)
* Groundspeed
* Flight path angle
* Drift angle
* Track angle
* Wind velocity and direction
* Horizontal position accuracy (actual navigation
performance).
ADIRU Selection
The FMC sees the inertial reference (IR) data and the air data
reference (ADR) data as two different sensors.
Usually, the FMC receives inertial data from the left ADIRU. If
the left ADIRU malfunctions or is in the ATT or ALIGN mode, the
FMC uses the data from the right ADIRU.
The FMC uses the same air data source as the DFCS. Flight
control computer (FCC) A gets ADR data from the left ADIRU
and FCC B gets ADR data from the right ADIRU. If FCC A is
engaged, the FMC uses ADR data from the left ADIRU. If FCC B
is engaged, the FMC uses ADR data from the right ADIRU.
DEU
The display electronic units (DEUs) send CDS BITE response
data and EFIS control panel mode discretes to the FMCS.
The DEUs send these EFIS control panel discretes to the FMC:
* Center display format
* Airports selected
* Route data selected
* Waypoint selected
* Ground station data selected
* Position data selected
* PFD/ND display format
* Plan mode selected
* Map mode selected
* VOR mode selected
* Approach mode selected
* Range selected.
The DEUs also send APU and main engine EEC BITE response
data on the same bus. There is no direct BITE interface between
the FMCS and the APU and EEC. The DEUs are a buffer
between the APU, EEC, and the FMCS.
FQPU
The fuel quantity processor unit (FQPU) calculates total fuel
weight and sends it to the FMCS. Fuel quantity BITE response
data also comes from the FQPU.
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General
The FMC data on bus 01 and 02 goes directly to the ADIRUs.
The other user systems get this FMC data through the transfer
relays.
Data Output
Bus 01 and 02 have this data:
* Distance-to-go (waypoint)
* Groundspeed
* VOR/DME frequencies
* Set latitude
* Set longitude
* Set magnetic heading
* Origin/destination
* Destination runway
* Destination estimated time of arrival (ETA)
* Gross weight
* Total fuel
* FMC target altitude
* FMC target airspeed
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