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leg change while enroute, (or 5 seconds while using approach
procedural legs) prior to the TO waypoint. The MSG key light will
not illuminate for this message. The instrument panel WPT alert
annunciator will illuminate steady to alert the pilot of an impending
leg change.
WINDS ALOFT RCVD - Winds aloft data has been received via
AFIS Uplink or AFIS DTU.
WAYPOINT IN USE - This message occurs when attempting to
delete a waypoint from the pilot defined data base which is in use on
the flight plan.
XFILL CONFIG MISMATCH - Crossfill data has been pushed to an
FMS not configured to receive that data type. This message alerts
the crew that crossfill data was sent and received but not accepted.
Once read this message is removed from the MESSAGE page.
400 Hz REF FAIL - 400 Hz (AC) power has failed and there is no
input to the analog roll steering. This message is suppressed if the
system is installed in an "all digital" aircraft. It remains on the
message page as long as the condition exists.
Glossary
2423sv602 Gloss-1
Change 1
GLOSSARY
ABS - Absolute (as contrasted to “relative”). Mode of navigation for
the Omega/VLF Sensor System.
absolute accuracy - The ability to determine true geographic
position.
ACARS - Airborne Communications Addressing and Reporting
System.
ACU - Antenna Coupler Unit; part of the UNC-OSS Sensor System.
ADC - Air Data Computer. Provides True Air Speed (TAS) and
altitude. - see also DADC.
additional secondary factor - Calibration factors designed to
compensate for the difference in propagation characteristics
between land and sea.
ADS - Air Data Sensor.
AFCS - Automatic Flight Control System.
AFIS - Airborne Flight Information Systems.
AHRS - Attitude Heading Reference System.
air data system - A sophisticated system for measuring air
temperature, pitot pressure, and static pressure. Used to obtain
highly accurate TAS, Mach, altitude, and static air temperature. Also
called an “Air Data Computer”. See also ADC.
ALTERR - Altitude Error displayed when the VNAV mode is in use.
The number displayed is the difference, in feet, between the actual
aircraft altitude and VNAV computed on-glideslope altitude for that
point.
ANT - Antenna.
Glossary
Gloss-2 2423sv602
Change 1
APPR - Approach.
area navigation - Navigation along random routes within the area of
coverage of referenced facilities, or within the limits of self-contained
area navigational aids, precluding the need to overfly specific
navigational facilities.
ARINC - Data interface format (e.g., ARINC 429); ARINC is an
abbreviation of “Aeronautical Radio, Inc.”
ARPT - Airport.
ARTU - ARINC Radio Tune Unit.
ASU - Antenna Switching Unit.
baseline - The imaginary great circle line connecting a Loran C
master station with a secondary station, or the imaginary great circle
line connecting two OMEGA or two VLF stations.
baseline extension - The extension of the baseline beyond the
Loran-C master or secondary station, or beyond an OMEGA or VLF
station.
BCD - Binary Coded Decimal (number representation).
BCP - Best Computed Position; as determined by Universal’s FMS.
A typically installed fully integrated FMS processes range
information from the DME, true airspeed from the Air Data
Computer, velocity data from an inertial reference sensor, position
data from the VLF/Omega, Loran C, GPS and aircraft heading in
order to derive the one best computed position and velocity as a
weighted average of the various sensor inputs.
CCU - Cockpit Control Unit.
CDI - Course Deviation Indicator.
CEP - Circular Error Probable.
Glossary
2423sv602 Gloss-3
Change 1
Checksum - A process (transparent to the user) which generates
and checks, special control characters used in validating that data is
properly transferred/stored between (computer) components.
CHP - Course Heading Panel.
Clutter - In radar operations, clutter refers to the reception and
visual display of radar returns caused by precipitation, chaff, terrain,
numerous aircraft targets, or other phenomena.
coast-in - The first point of land reached when flying from seaward.
coast-out - The last point of land crossed when departing seaward.
COMM - Communication.
CPU - A computer’s Central Processing Unit.
cross track distance - The distance and direction right or left
between the aircraft and the desired track.
CRS - Course.
CRT - Cathode Ray Tube.
CSDB - Commercial Standard Data Bus.
DA - Drift Angle.
DADC - Digital Air Data Computer - see also ADC.
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