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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 Air Traffic Control is exercising control over aircraft in uncontrolled airspace; however, it provides a means for the aircraft to proceed to destination airport, descend and land in accordance with applicable Federal Air Regulations 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/LEVEL (P/CG) - An altitude or Flight Level maintained during enroute level flight. This is a constant altitude and should not be confused with a cruise clearance. (See Altitude)
CRUISING ALTITUDE (JCS, NATO) - A level determined by vertical measurement from Mean Sea Level, maintained during a flight or portion thereof.
CRUISING LEVEL (JCS, NATO, ICAO) - A level maintained during a significant portion of a flight.
CURRENT FLIGHT PLAN (ICAO) - The Flight plan, including changes, if any, brought about by subsequent clearances.
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.
DECISION ALTITUDE/DA (JCS, NATO) - An altitude related to the highest elevation in the Touchdown Zone, specified for a glide slope approach, at which a missed-approach procedure must be initiated if the required visual reference has not been established. (See Decision Height)
DECISION ALTITUDE/HEIGHT/DA/DH (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 reference to Mean Sea Level (MSL) and Decision Height (DH) is reference 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/DH (P/CG) - With respect to the operation of aircraft, means the height at which a decision must be made, during an Instrument Landing System, Microwave Landing System or Precision Approach Radar instrument approach, to either continue the approach or to execute a missed approach.
DECISION HEIGHT/DH (JCS, NATO) - A height above the highest elevation in the Touchdown Zone, specified for a glide slope approach, at which a missed-approach procedure must be initiated if the required visual reference has not been established.
DECODER - The device used to decipher signals received from Air Traffic Control Radar Beacon System transponders to effect their display as select codes. (See Codes, Radar).
DEFENSE VISUAL FLIGHT RULES/DVFR - Rules applicable to flight within an Air Defense Identification Zone conducted under the Visual Flight Rules in Federal Air Regulations Part 91. (See Air Defense Identification Zone) (Refer to Federal Air Regulations Part 99).
DELAY INDEFINITE (REASON IF KNOWN) EXPECT FURTHER CLEARANCE (TIME) - Used by Air Traffic Control to inform a pilot when an accurate estimate of the delay time and the reason for the delay cannot immediately be determined; e.g., a disabled aircraft on the runway, terminal or center area saturation, weather below landing minimums, etc. (See Expect Further Clearance).
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