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performance data is stored in the operational program for use if
the airline custom PDDB is not loaded.
The aerodynamic model includes this data:
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* Optimum altitudes
* Speed schedules
* Operating limits
* Drag data for dual and single engine operation.
The fuel flow/N1 thrust model is used to calculate fuel flows and
thrust limits corrected for the effects of air conditioning and
airframe anti-ice bleed air demands.
The model/engine performance data base (MEDB) has the
same type of information and does the same function as the
performance default data base. However, the MEDB contains
the data for the 737-600/700/800 series airplanes. The MEDB is
loadable through the data base loader and is not part of the
operational flight program.
The software options data base has the software options that
have been selected. These are the software options:
* Runway position update (runway offset in meters)
* Manual T/O speeds
* GPS navigation
* GPS direct input
* AOC datalink
* Alternate destination
* QRH takeoff speeds
* Plan fuel
* QFE landing reference
* Default RNP
* NDB size
The ACARS datalink data base has the software that permits the
uplink and downlink of data between the FMC and a ground
network.
All these data bases are loadable with a data base loader.
Navigation
The navigation function gives airplane position (FMC position)
and autotuning capability for the navigation radios.
The FMCS uses these sensors to calculate the FMC position:
* Global positioning system
* NAV radio data
* ADIRS.
The flight crew can manually build the route or select it from the
company navigation data base. When the route has been
activated, it shows on the navigation display of the CDS.
Performance
The performance function gives flight profile information and
target engine N1 speeds. This lets the airplane fly at the most
economical altitudes and speeds for the conditions.
The FMC uses this information to calculate performance data:
* CDU data (cost index, CRZ altitude, etc.)
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* Air data and inertial reference information
* Fuel weight
* Engine bleed air data
* Airplane and engine information from the model/engine
performance database.
The economy mode is the primary performance mode for the
climb, cruise, and descent phase of flight. The flight crew can
select other operating modes at any time.
Guidance
The guidance function sends flight path and steering commands
to the digital flight control system (DFCS) and the autothrottle
(A/T).
For lateral navigation (LNAV), the FMC calculates the route and
compares it to the FMC position. If they are different, the FMC
calculates a roll steering command and sends it to the DFCS.
For vertical navigation (VNAV), the FMC calculates speed and
vertical speed targets and sends them to the the DFCS. The
FMC also calculates N1 thrust and speed targets and sends
them to the A/T. The autothrottle and autopilot follow the targets
and commands to keep the airplane on the calculated flight
path.
During climb or descent, the FMCS sends speed and altitude
targets to the DFCS. During level flight, the FMCS sends speed
commands to the A/T.
Other Functions
The aircraft communications and reporting system (ACARS)
lets the FMC receive (uplink) and send (downlink) messages to
the operators ground network. The uplink can be used to send
flight plan data, weather or other pertinent information. The
downlink can be used by the flight crew to request flight
planning or performance data.
The ACARS function controls the messages sent to and from the
ground with ACARS. Some messages show when the crew
selects the correct command on the CDU. Other messages are
automatic. The ACARS configuration data base controls the
automatic messages.
The display function sends display data to the common display
system and the CDUs. The data includes route and position data
and N1 data.
The ALERT function does a check of the FMC status. It turns on
　
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