8/15/19 7/16/20  Pilot/Controller Glossary Pilot/Controller Glossary  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.  (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  CONTROLLED AIRSPACE- An airspace of  defined dimensions within which air traffic control  service is provided to IFR flights and to VFR flights  in accordance with the airspace classification.  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.  (See DISCRETE FREQUENCY.)  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.  CONTROL AREA [ICAO]- A controlled airspace  extending upwards from a specified limit above the  earth.  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.  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.)  CONTINENTAL UNITED STATES- The 49 States  located on the continent of North America and the  District of Columbia .  CONTERMINOUS U.S.- The 48 adjoining States  and the District of Columbia.  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.  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.  PCG C-6 