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airport is necessary, the pilot shall make the letdown
in accordance with a standard/special instrument
approach procedure for that airport, or
b. An airport clearance limit at locations that are
within/below/outside controlled airspace and without
a standard/special instrument approach
procedure. Such a clearance is NOT AUTHORIZATION
for the pilot to descend under IFR conditions
below the applicable minimum IFR altitude nor does
it imply that ATC is exercising control over aircraft
in Class G airspace; however, it provides a means for
the aircraft to proceed to destination airport, descend,
and land in accordance with applicable CFRs
governing VFR flight operations. Also, this provides
search and rescue protection until such time as the
IFR flight plan is closed.
(See INSTRUMENT APPROACH
PROCEDURE.)
CRUISE CLIMB- A climb technique employed by
aircraft, usually at a constant power setting, resulting
in an increase of altitude as the aircraft weight
decreases.
CRUISING ALTITUDE- An altitude or flight level
maintained during en route level flight. This is a
constant altitude and should not be confused with a
cruise clearance.
(See ALTITUDE.)
(See ICAO term CRUISING LEVEL.)
CRUISING LEVEL-
(See CRUISING ALTITUDE.)
CRUISING LEVEL [ICAO]- A level maintained
during a significant portion of a flight.
2/14/08 Pilot/Controller Glossary
PCG C-9
CT MESSAGE- An EDCT time generated by the
ATCSCC to regulate traffic at arrival airports.
Normally, a CT message is automatically transferred
from the Traffic Management System computer to the
NAS en route computer and appears as an EDCT. In
the event of a communication failure between the
TMS and the NAS, the CT message can be manually
entered by the TMC at the en route facility.
CTA-
(See CONTROLLED TIME OF ARRIVAL.)
(See ICAO term CONTROL AREA.)
CTAF-
(See COMMON TRAFFIC ADVISORY
FREQUENCY.)
CTAS-
(See CENTER TRACON AUTOMATION
SYSTEM.)
CTRD-
(See CERTIFIED TOWER RADAR DISPLAY.)
CURRENT FLIGHT PLAN [ICAO]- The flight
plan, including changes, if any, brought about by
subsequent clearances.
CURRENT PLAN- The ATC clearance the aircraft
has received and is expected to fly.
CVFP APPROACH-
(See CHARTED VISUAL FLIGHT PROCEDURE
APPROACH.)
CWA-
(See CENTER WEATHER ADVISORY and
WEATHER ADVISORY.)
JO 7110.65S 2/14/08
-2
2/14/08 Pilot/Controller Glossary
PCG D-1
D
D‐ATIS-
(See DIGITAL‐AUTOMATIC TERMINAL
INFORMATION SERVICE.)
DA [ICAO]-
(See ICAO Term DECISION
ALTITUDE/DECISION HEIGHT.)
DAIR-
(See DIRECT ALTITUDE AND IDENTITY
READOUT.)
DANGER AREA [ICAO]- An airspace of defined
dimensions within which activities dangerous to the
flight of aircraft may exist at specified times.
Note:The term “Danger Area” is not used in
reference to areas within the United States or any
of its possessions or territories.
DAS-
(See DELAY ASSIGNMENT.)
DATA BLOCK-
(See ALPHANUMERIC DISPLAY.)
DEAD RECKONING- Dead reckoning, as applied
to flying, is the navigation of an airplane solely by
means of computations based on airspeed, course,
heading, wind direction, and speed, groundspeed,
and elapsed time.
DECISION ALTITUDE/DECISION HEIGHT
[ICAO]- A specified altitude or height (A/H) in the
precision approach at which a missed approach must
be initiated if the required visual reference to
continue the approach has not been established.
Note 1:Decision altitude [DA] is referenced to
mean sea level [MSL] and decision height [DH] is
referenced to the threshold elevation.
Note 2:The required visual reference means that
section of the visual aids or of the approach area
which should have been in view for sufficient time
for the pilot to have made an assessment of the
aircraft position and rate of change of position, in
relation to the desired flight path.
DECISION HEIGHT- With respect to the operation
of aircraft, means the height at which a decision must
be made during an ILS, MLS, or PAR instrument
approach to either continue the approach or to execute
a missed approach.
(See ICAO term DECISION
ALTITUDE/DECISION HEIGHT.)
DECODER- The device used to decipher signals
received from ATCRBS transponders to effect their
display as select codes.
(See CODES.)
(See RADAR.)
DEFENSE VISUAL FLIGHT RULES- Rules
applicable to flights within an ADIZ conducted under
the visual flight rules in 14 CFR Part 91.
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