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DB - Data Base.
DDA - Double-Density ARINC board. Resides in the Nav Computer
Unit.
DDU - Disk Drive Unit.
dead reckoning - The directing of an aircraft and the determination
of its position by the application of direction and speed information to
a previous position.
Glossary
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desired track - In VOR/DME based RNAV, the Rhumb Line course
between selected waypoints. In long-range navigation, the Great
Circle course between selected waypoints.
DEV - Deviation; compass error caused by magnetism within the
aircraft.
deviation - Compass error caused by magnetism within the aircraft.
DEXP - Date of Expiration of stored navaid data base.
DGPS - Differential GPS.
differential GPS - An addition to the NAVSTAR/GPS system which
uses corrections from a ground station for the purpose of enhancing
GPS accuracy for all users within range of the associated ground
station.
direct wave - Radiated energy which follows a line-of-sight path
between the source and the receiver or sensor.
diurnal effect - Variation in the height of the ionosphere caused by
sunlight; a daily phenomenon.
DME/P - Precision Distance Measuring Equipment.
DMU - Data Management Unit.
DOD - Department of Defense.
dP - Pressure Differential (e.g., cabin to outside).
DR - Dead Reckoning.
DRIFT - Drift angle in degrees left (L) or right (R) of the aircraft
heading (caused by wind).
drift - Displacement from the direction in which the aircraft is headed
caused by a crosswind component.
Glossary
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drift angle - The angle between aircraft heading and the desired
track, expressed in terms of right or left according to the direction in
which the aircraft has drifted.
DTK - Desired Track.
DTO - Direct-To; direct route or course.
DTU - Data Transfer Unit.
DZH - Drop Zone (Axis) Heading.
DZL - Drop Zone Length.
EADI - Electronic Attitude Director Indicator.
EFIS - Electronic Flight Information System.
EFIS/MFD - Electronic Flight Information System Multifunction
Display.
EHSI - Electronic Horizontal Situation Indicator.
EMI - Electromagnetic Interference.
EOA - End of Approach.
ephemeris - The position of an astronomical body.
ERP - EFIS Radar Panel.
ESAD - Equivalent Still Air Distance. Distance aircraft has flown
through air mass eliminating the effect of the wind. This is used
extensively by airlines flying fixed routes for comparing operational
efficiency.
extended range modal interference - Modal interference affecting
OMEGA/VLF signal propagation at ranges that vary from 1,000 to
2,000 nautical miles.
FACF - Final Approach Course Fix.
Glossary
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FAF - See Final Approach Fix.
FAP - See Final Approach Point.
FGS - Flight Guidance System.
Final Approach Fix - The fix from which the final approach (IFR) to
an airport is executed and which identifies the beginning of the final
approach segment.
Final Approach - IFR - The flight path of an aircraft which is
inbound to an airport on a final instrument approach course,
beginning at the final approach fix or point and extending to the
airport or the point where a circle to land maneuver or a missed
approach is executed.
Final Approach Point - The point, applicable only to a nonprecision
approach with no depicted FAF (such as an on-airport VOR), where
the aircraft is established inbound on the final approach course from
the procedure turn and where the final approach descent may be
commenced.
Flight Management System - A computer system that uses a large
data base to allow routes to be preprogrammed and fed into the
system by means of a data loader. The system is constantly
updated with respect to position accuracy by reference to
conventional navigation aids. The sophisticated program and its
associated data base insures that the most appropriate aids are
automatically selected during the information update cycle.
FMS - See Flight Management System.
FMS XFILL - Transfer data from one FMS to another in a multiple
FMS configuration.
FPA - Flight Path Angle (glide slope) in degrees required for the
approach segment between the FR and TO waypoints (current leg).
FPCDU - Flat Panel Control Display Unit. Consists of a color liquid
crystal display and a keyboard with function and alphanumeric keys.
Main interface between the operator and the Navigation and Flight
Management Systems on other Universal products.
Glossary
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FSS - Flight Service Station.
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