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Pilot/Controller Glossary 

6/17/21 

CONFLICT RESOLUTION

 The resolution of 

potential conflictions between aircraft that are radar 
identified and in communication with ATC by 
ensuring that radar targets do not touch. Pertinent 
traffic advisories shall be issued when this procedure 
is applied. 

Note: This procedure shall not be provided utilizing 

mosaic radar systems. 

CONFORMANCE

 The condition established when 

an aircraft’s actual position is within the conformance 
region constructed around that aircraft at its position, 
according to the trajectory associated with the 
aircraft’s Current Plan. 

CONFORMANCE REGION

 A volume, bounded 

laterally, vertically, and longitudinally, within which 
an aircraft must be at a given time in order to be in 
conformance with the Current Plan Trajectory for that 
aircraft. At a given time, the conformance region is 
determined by the simultaneous application of the 
lateral, vertical, and longitudinal conformance 
bounds for the aircraft at the position defined by time 
and aircraft’s trajectory. 

CONSOLAN

 A low frequency, long-distance 

NAVAID used principally for transoceanic naviga-
tions. 

CONTACT

 

a. 

Establish communication with (followed by the 

name of the facility and, if appropriate, the frequency 
to be used). 

b. 

A flight condition wherein the pilot ascertains 

the attitude of his/her aircraft and navigates by visual 
reference to the surface. 

(See CONTACT APPROACH.) 

(See RADAR CONTACT.) 

CONTACT APPROACH

 An approach wherein an 

aircraft on an IFR flight plan, having an air traffic 
control authorization, operating clear of clouds with 
at least 1 mile flight visibility and a reasonable 
expectation of continuing to the destination airport in 
those conditions, may deviate from the instrument 
approach procedure and proceed to the destination 
airport by visual reference to the surface. This 
approach will only be authorized when requested by 
the pilot and the reported ground visibility at the 
destination airport is at least 1 statute mile. 

(Refer to AIM.) 

CONTAMINATED RUNWAY

 A runway is 

considered contaminated whenever standing water, 
ice, snow, slush, frost in any form, heavy rubber, or 
other substances are present. A runway is contami-
nated with respect to rubber deposits or other 
friction-degrading substances when the average 
friction value for any 500-foot segment of the runway 
within the ALD fails below the recommended 
minimum friction level and the average friction value 
in the adjacent 500-foot segments falls below the 
maintenance planning friction level. 

CONTERMINOUS U.S.

  The 48 adjoining States 

and the District of Columbia. 

CONTINENTAL UNITED STATES

 The 49 States 

located on the continent of North America and the 
District of Columbia

CONTINGENCY HAZARD AREA (CHA)

 Used 

by ATC. Areas of airspace that are defined and 
distributed in advance of a launch or reentry 
operation and are activated in response to a failure. 

(See AIRCRAFT HAZARD AREA.) 
(See REFINED HAZARD AREA.) 
(See TRANSITIONAL HAZARD AREA.) 

CONTINUE

 When used as a control instruction 

should be followed by another word or words 
clarifying what is expected of the pilot. Example: 
“continue taxi,” “continue descent,” “continue 
inbound,” etc. 

CONTROL AREA [ICAO]

 A controlled airspace 

extending upwards from a specified limit above the 
earth. 

CONTROL SECTOR

 An airspace area of defined 

horizontal and vertical dimensions for which a 
controller or group of controllers has air traffic 
control responsibility, normally within an air route 
traffic control center or an approach control facility. 
Sectors are established based on predominant traffic 
flows, altitude strata, and controller workload. Pilot 
communications during operations within a sector 
are normally maintained on discrete frequencies 
assigned to the sector. 

(See DISCRETE FREQUENCY.) 

CONTROL SLASH

 A radar beacon slash repre-

senting the actual position of the associated aircraft. 
Normally, the control slash is the one closest to the 
interrogating radar beacon site. When ARTCC radar 
is operating in narrowband (digitized) mode, the 
control slash is converted to a target symbol. 

PCG C