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Aeronautical Information Manual (AIM), page 635

5/26/16
12/10/15

CRUISE- Used in an ATC clearance to authorize a
pilot to conduct flight at any altitude from the
minimum IFR altitude up to and including the
altitude specified in the clearance. The pilot may
level off at any intermediate altitude within this block
of airspace. Climb/descent within the block is to be
made at the discretion of the pilot. However, once the
pilot starts descent and verbally reports leaving an
altitude in the block, he/she may not return to that
altitude without additional ATC clearance. Further, it
is approval for the pilot to proceed to and make an
approach at destination airport and can be used in
conjunction with:
a. An airport clearance limit at locations with a
standard/special instrument approach procedure. The
CFRs require that if an instrument letdown to an
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 with-
out a standard/special instrument approach
procedure. Such a clearance is NOT AUTHORIZA-
TION 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.)

Pilot/Controller Glossary

CRUISING LEVEL-
(See CRUISING ALTITUDE.)

CRUISING LEVEL [ICAO]- A level maintained
during a significant portion of a flight.
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
traffic management system computer 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.)

CTOP-
(See COLLABORATIVE TRAJECTORY
OPTIONS PROGRAM)
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.)


PCG C-9

Page 635 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   634 -- Page 635 -- 636