Jeppesen Private Pilot Glossary 2025
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ABSOLUTE ALTITUDE - 🧠ANSWER ✔✔actual height above the surface of
the earth, either land or water.
ABSOLUTE CEILING - 🧠ANSWER ✔✔the altitude where a particular
airplane's climb rate reaches zero.
ADIABATIC COOLING - 🧠ANSWER ✔✔process of cooling air through
expansion, as when air moves UP a slope, expands with the reduction of
atmospheric pressure and cools as it expands.
ADIABATIC HEATING - 🧠ANSWER ✔✔process of heating dry air through
compression, as when air moves DOWN a slope and is compressed, which
results in an increase in temperature.
,ADVECTION FOG - 🧠ANSWER ✔✔fog resulting from the movement of
warm, humid air over a cold surface.
AERONAUTICAL DECISION MAKING (ADM) - 🧠ANSWER ✔✔a
systematic approach to the mental process used by aircraft pilots to
consistently determine the best course of action in response to
circumstances.
AGONIC LINE - 🧠ANSWER ✔✔line along which the variation between true
and magnetic values is zero.
AIR DENSITY - 🧠ANSWER ✔✔mass per unit volume of air. dense air has
more molecules per unit volume than less-dense air. air density decreases
with altitude above the surface of the earth and with increasing
temperature.
AIR ROUTE TRAFFIC CONTROL CENTER (ARTCC) - 🧠ANSWER ✔✔a
facility established to provide air traffic control service to aircraft operating
on IFR flight plans within controlled airspace, principally during the enroute
phase of flight.
AIR TRAFFIC CONTROL (ATC) - 🧠ANSWER ✔✔an FAA service to enable
safe, orderly and expeditious flow of air traffic.
,AIRMASS - 🧠ANSWER ✔✔an extensive body of air having fairly uniform
properties of temperature and moisture.
AIRMET - 🧠ANSWER ✔✔in flight weather advisory concerning moderate
icing, moderate turbulence, sustained winds of 30 kts or more at the
surface and widespread areas of ceilings less than 1000 ft and/or visibility
less than 3 miles.
AIRPORT SURVEILLANCE RADAR (ASR) - 🧠ANSWER ✔✔Approach and
departure control radar to detect and display an aircraft's position in the
terminal area.
ALERT AREA - 🧠ANSWER ✔✔special use airspace which may contain
high volume of pilot training activities or an unusual type of aerial activity.
ALTIMETER - 🧠ANSWER ✔✔flight instrument that indicates altitude by
sensing pressure changes.
ALTIMETER SETTING - 🧠ANSWER ✔✔the barometric pressure setting
used to adjust a pressure altimeter for variations in existing atmospheric
pressure and temperature.
ALTITUDE - 🧠ANSWER ✔✔height expressed in units of distance above a
reference plane, usually above mean sea level or above ground level.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, ANGLE OF ATTACK - 🧠ANSWER ✔✔angle between the airfoil chord line
and the relative wind.
ANNUAL INSPECTION - 🧠ANSWER ✔✔recurring examination of an
aircraft that is required to maintain its airworthiness.
ANGLE OF INCIDENCE - 🧠ANSWER ✔✔angle between the chord line of
the wing and the longitudinal axis of the airplane.
ARM - 🧠ANSWER ✔✔the distance from the reference datum at which a
weight may be located. used in weight and balance calculations to
determine moment.
ASPECT RATIO - 🧠ANSWER ✔✔span of a wing divided by its average
chord.
AUTOMATED SURACE OBSERVATION SYSTEM (ASOS) - 🧠ANSWER
✔✔national weather service airport reporting system that provides
comprehensive surface observations every minute via digitized voice
broadcasts and textual reports.
AUTOMATED WEATHER OBSERVING SYSTEM (AWOS) - 🧠ANSWER
✔✔FAA funded airport weather system consisting of one or more sensors,
Expert Verified | Ace the Test
ABSOLUTE ALTITUDE - 🧠ANSWER ✔✔actual height above the surface of
the earth, either land or water.
ABSOLUTE CEILING - 🧠ANSWER ✔✔the altitude where a particular
airplane's climb rate reaches zero.
ADIABATIC COOLING - 🧠ANSWER ✔✔process of cooling air through
expansion, as when air moves UP a slope, expands with the reduction of
atmospheric pressure and cools as it expands.
ADIABATIC HEATING - 🧠ANSWER ✔✔process of heating dry air through
compression, as when air moves DOWN a slope and is compressed, which
results in an increase in temperature.
,ADVECTION FOG - 🧠ANSWER ✔✔fog resulting from the movement of
warm, humid air over a cold surface.
AERONAUTICAL DECISION MAKING (ADM) - 🧠ANSWER ✔✔a
systematic approach to the mental process used by aircraft pilots to
consistently determine the best course of action in response to
circumstances.
AGONIC LINE - 🧠ANSWER ✔✔line along which the variation between true
and magnetic values is zero.
AIR DENSITY - 🧠ANSWER ✔✔mass per unit volume of air. dense air has
more molecules per unit volume than less-dense air. air density decreases
with altitude above the surface of the earth and with increasing
temperature.
AIR ROUTE TRAFFIC CONTROL CENTER (ARTCC) - 🧠ANSWER ✔✔a
facility established to provide air traffic control service to aircraft operating
on IFR flight plans within controlled airspace, principally during the enroute
phase of flight.
AIR TRAFFIC CONTROL (ATC) - 🧠ANSWER ✔✔an FAA service to enable
safe, orderly and expeditious flow of air traffic.
,AIRMASS - 🧠ANSWER ✔✔an extensive body of air having fairly uniform
properties of temperature and moisture.
AIRMET - 🧠ANSWER ✔✔in flight weather advisory concerning moderate
icing, moderate turbulence, sustained winds of 30 kts or more at the
surface and widespread areas of ceilings less than 1000 ft and/or visibility
less than 3 miles.
AIRPORT SURVEILLANCE RADAR (ASR) - 🧠ANSWER ✔✔Approach and
departure control radar to detect and display an aircraft's position in the
terminal area.
ALERT AREA - 🧠ANSWER ✔✔special use airspace which may contain
high volume of pilot training activities or an unusual type of aerial activity.
ALTIMETER - 🧠ANSWER ✔✔flight instrument that indicates altitude by
sensing pressure changes.
ALTIMETER SETTING - 🧠ANSWER ✔✔the barometric pressure setting
used to adjust a pressure altimeter for variations in existing atmospheric
pressure and temperature.
ALTITUDE - 🧠ANSWER ✔✔height expressed in units of distance above a
reference plane, usually above mean sea level or above ground level.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
, ANGLE OF ATTACK - 🧠ANSWER ✔✔angle between the airfoil chord line
and the relative wind.
ANNUAL INSPECTION - 🧠ANSWER ✔✔recurring examination of an
aircraft that is required to maintain its airworthiness.
ANGLE OF INCIDENCE - 🧠ANSWER ✔✔angle between the chord line of
the wing and the longitudinal axis of the airplane.
ARM - 🧠ANSWER ✔✔the distance from the reference datum at which a
weight may be located. used in weight and balance calculations to
determine moment.
ASPECT RATIO - 🧠ANSWER ✔✔span of a wing divided by its average
chord.
AUTOMATED SURACE OBSERVATION SYSTEM (ASOS) - 🧠ANSWER
✔✔national weather service airport reporting system that provides
comprehensive surface observations every minute via digitized voice
broadcasts and textual reports.
AUTOMATED WEATHER OBSERVING SYSTEM (AWOS) - 🧠ANSWER
✔✔FAA funded airport weather system consisting of one or more sensors,
