时间：2011-04-18 00:52来源：蓝天飞行翻译 作者：航空 点击：次
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(See ICAO term CLEARANCE LIMIT.)CLEARANCE LIMIT [ICAO]. The point of which an aircraft is granted an air traffic control clearance. CLEARANCE VOID IF NOT OFF BY (TIME). Used by ATC to advise an aircraft that the departure clearance is automatically canceled if takeoff is not made prior to a specified time. The pilot must obtain a new clearance or cancel his/her IFR flight plan if not off by the specified time. (See ICAO term CLEARANCE VOID TIME.)CLEARANCE VOID TIME [ICAO]. A time specified by an air traffic control unit at which a clearance ceases to be valid unless the aircraft concerned has already taken action to comply therewith. CLEARED APPROACH. ATC authorization for an aircraft to execute any standard or special instrument approach procedure for that airport. Normally, an aircraft will be cleared for a specific instrument approach procedure. (See CLEARED (Type of) APPROACH.)(See INSTRUMENT APPROACH PROCEDURE.)(Refer to 14 CFR Part 91.)(Refer to AIM.)CLEARED (Type of) APPROACH. ATC authoriza-tion for an aircraft to execute a specific instrument Pilot/Controller Glossary approach procedure to an airport; e.g., “Cleared ILS Runway Three Six Approach.” (See APPROACH CLEARANCE.)(See INSTRUMENT APPROACH PROCEDURE.)(Refer to 14 CFR Part 91.)(Refer to AIM.)CLEARED AS FILED. Means the aircraft is cleared to proceed in accordance with the route of flight filed in the flight plan. This clearance does not include the altitude, DP, or DP Transition. (See REQUEST FULL ROUTE CLEARANCE.)(Refer to AIM.)CLEARED FOR TAKEOFF. ATC authorization for an aircraft to depart. It is predicated on known traffic and known physical airport conditions. CLEARED FOR THE OPTION. ATC authoriza-tion for an aircraft to make a touch-and-go, low approach, missed approach, stop and go, or full stop landing at the discretion of the pilot. It is normally used in training so that an instructor can evaluate a student’s performance under changing situations. (See OPTION APPROACH.)(Refer to AIM.)CLEARED THROUGH. ATC authorization for an aircraft to make intermediate stops at specified airports without refiling a flight plan while en route to the clearance limit. CLEARED TO LAND. ATC authorization for an aircraft to land. It is predicated on known traffic and known physical airport conditions. CLEARWAY. An area beyond the takeoff runway under the control of airport authorities within which terrain or fixed obstacles may not extend above specified limits. These areas may be required for certain turbine-powered operations and the size and upward slope of the clearway will differ depending on when the aircraft was certificated. (Refer to 14 CFR Part 1.)CLIMB TO VFR. ATC authorization for an aircraft to climb to VFR conditions within Class B, C, D, and E surface areas when the only weather limitation is restricted visibility. The aircraft must remain clear of clouds while climbing to VFR. (See SPECIAL VFR CONDITIONS.)(Refer to AIM.)CLIMBOUT. That portion of flight operation between takeoff and the initial cruising altitude. PCG C.3 CLOSE PARALLEL RUNWAYS. Two parallel runways whose extended centerlines are separated by less than 4,300 feet, having a Precision Runway Monitoring (PRM) system that permits simultaneous independent ILS approaches. CLOSED RUNWAY. A runway that is unusable for aircraft operations. Only the airport management/ military operations office can close a runway. CLOSED TRAFFIC. Successive operations involv-ing takeoffs and landings or low approaches where the aircraft does not exit the traffic pattern. CLOUD. A cloud is a visible accumulation of minute water droplets and/or ice particles in the atmosphere above the Earth’s surface. Cloud differs from ground fog, fog, or ice fog only in that the latter are, by definition, in contact with the Earth’s surface. CLT. (See CALCULATED LANDING TIME.)CLUTTER. In radar operations, clutter refers to the reception and visual display of radar returns caused by precipitation, chaff, terrain, numerous aircraft targets, or other phenomena. Such returns may limit or preclude ATC from providing services based on radar. (See CHAFF.)(See GROUND CLUTTER.)(See PRECIPITATION.)(See TARGET.)(See ICAO term RADAR CLUTTER.)CMNPS. (See CANADIAN MINIMUM NAVIGATION PERFORMANCE SPECIFICATION AIRSPACE.)COASTAL FIX. A navigation aid or intersection where an aircraft transitions between the domestic route structure and the oceanic route structure. CODES. The number assigned to a particular multiple pulse reply signal transmitted by a transponder. (See DISCRETE CODE.)COMBINED CENTER-RAPCON. An air traffic facility which combines the functions of an ARTCC and a radar approach control facility. (See AIR ROUTE TRAFFIC CONTROL CENTER.)(See RADAR APPROACH CONTROL FACILITY.)COMMON POINT. A significant point over which two or more aircraft will report passing or have reported passing before proceeding on the same or diverging tracks. To establish/maintain longitudinal separation, a controller may determine a common point not originally in the aircraft’s flight plan and then clear the aircraft to fly over the point. (See SIGNIFICANT POINT.)COMMON PORTION. (See COMMON ROUTE.)COMMON ROUTE. That segment of a North American Route between the inland navigation facility and the coastal fix. OR COMMON ROUTE. Typically the portion of a RNAV STAR between the en route transition end point and the runway transition start point; however, the common route may only consist of a single point that joins the en route and runway transitions. COMMON TRAFFIC ADVISORY FREQUENCY (CTAF). A frequency designed for the purpose of carrying out airport advisory practices while operating to or from an airport without an operating control tower. The CTAF may be a UNICOM, Multicom, FSS, or tower frequency and is identified in appropriate aeronautical publications. |
