7.4. Glossary
ºC
Degrees Celsius
ºF
Degrees Fahrenheit
Accuracy
Estimated position accuracy in feet or meters
A/D
Analog to Digital
AC
Alternating Current
ACU
Analog Converter Unit
ADC
Air Data Computer
ADI
Attitude Director Indicator
AFMS
Airplane Flight Manual Supplement
AGL
Above Ground Level
AHRS
Attitude Heading Reference System
AI
Attitude Indicator
AIM
Aeronautical Information Manual
AIRMET
Airman's Meteorological Information
Altitude
Elevation above mean sea level
APPR
Approach
APT
Airport
ARC
Partial Compass Rose, arc format (100°)
ARINC
Aeronautical Radio, Inc.
ATC
Air Traffic Control
ATIS
Automatic Terminal Information Service
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091-00027-001 Rev A EBD Pilots Guide V&H .indb 8
AWOS
Back Course
Battery Time
BC
Bearing
BP
Calibrated Airspeed
CDI
CFR
CM
Comm
Course
Course to Steer
Cross Track
EFD1000 PFD Pilot's Guide
Automated Weather Observation System
Localizer back course approach where the
signal on the back side of the localizer is used
for alignment to the runway opposite of normal
localizer alignment.
The time remaining on the battery before it is
fully discharged.
Back Course
The compass direction from the current position
to the destination.
Bearing Pointer
Indicated airspeed corrected for installation and
instrument errors.
Course Deviation Indicator
Code of Federal Regulations
Configuration Module
Communication radio
The route taken from the starting position to
destination.
The recommended direction to steer in order to
reduce cross-track error and return to the course
line.
The perpendicular distance, left or right, away
from the selected course.
091-00027-001 REV A
8/27/14 8:51 AM
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