MD-11 Flight Crew Operations Manual
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FMS -
Description and Operation
FMS.10.7
The route of flight is displayed on the ND, and when the descent phase is active,
a vertical deviation indicator is displayed to show aircraft deviation from the
computed flight path.
Software and Database
The FMC software includes the principal FMC operational program, navigation
database, and performance data for the MD-11 aircraft.
The operational program provides the following FMS functions:
Navigation - Radio autotuning, position, velocity, and wind data determination.
Performance - Trajectory determination, definition of guidance and control
targets, flight path predictions.
Guidance - Error determination, lateral steering and control command generation.
EIS - Computation of map and situation data for display.
MCDU - Processing of keystrokes, and flight plan construction.
I/O - Processing of received and transmitted data.
BIT - System monitoring, self-testing and record keeping.
Operating system - Executive control of the operational program, memory
management, and stored routines.
The purpose of the performance database is to reduce the need for the pilot to refer
to a performance manual during flight and to provide the FMC with data required
to transmit pitch and thrust commands to the FCC. The performance database is
also used by the FMC to provide detailed predictions along the entire aircraft
trajectory. The data stored in the database includes accurate aircraft drag and
engine model data, optimal speed data, maximum altitudes, and maximum and
minimum speeds.
The FMC navigation database includes most of the information the pilot would
normally determine by referring to navigation charts. This information can be
displayed on the MCDU or EIS map. The geographic area covered includes all
areas where the aircraft is normally flown. The database is tailored to specific
airline customers. The stored data includes the location of VHF navigation aids,
airports, runways, airways, holding patterns, geographical reference points, and
other airline-selected information such as SIDs, STARs, approaches, and
company routes. Up to 40 additional waypoints can be entered into temporary
database by the pilot.
The FMC contains two sets of navigation data updated by maintenance action
about every month to correspond to the normal revision cycle for navigation
charts. When the navigation chart revision date arrives, the new data should have
been loaded into the FMC and should be ready for pilot activation during preflight.
October 02, 2006
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