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HAVE NUMBERS - Used by pilots to inform Air Traffic Control that they have received runway, wind and altimeter information only.
HAZARDOUS INFLIGHT WEATHER ADVISORY SERVICE/HIWAS - A program for broadcasting hazardous weather information (Significant Meteorological Information, Convective Significant Meteorological Information, Center Weather Advisories, Airman's Meteorological Information, Severe Weather Forecast Alerts, and Urgent Pilot Weather Reports) on a continuous basis over selected VORs.
HEAVY (AIRCRAFT) - (See Aircraft Classes)
HEIGHT ABOVE AIRPORT/HAA - The height of the minimum descent altitude above the published airport elevation. This is published in conjunction with circling minimums. (See Minimum Descent Altitude)
HEIGHT ABOVE LANDING/HAL - The height above a designated helicopter landing area used for helicopter instrument approach procedures. (Refer to Federal Air Regulations Part 97)
HEIGHT ABOVE TOUCHDOWN/HAT - The height of the Decision Height or Minimum Descent Altitude above the highest runway elevation in the Touchdown Zone (first 3000 feet of the runway). HAT is published on instrument approach charts in conjunction with all straight-in minimums. (See Decision Height, Minimum Descent Altitude)
HELICOPTER/COPTER (P/CG) - Rotorcraft that for its horizontal motion, depends principally on its engine driven rotors.
HELICOPTER (ICAO) - A heavier-than-air aircraft supported in flight by the reactions of the air on one or more power driven rotors on substantially vertical axes.
HELIPAD (P/CG) - A small, designated area, usually with a prepared surface, on a heliport, airport, landing/take-off area, apron/ramp, or movement area used for take-off, landing, or parking of helicopters.
HELIPAD (JCS, NATO) - A prepared area designated and used for the take-off and landing of helicopters. (Include touchdown or hover point).
HELIPORT (P/CG) - An area of land, water, or structure used or intended to be used for the landing and take-off of helicopters and includes its buildings and facilities, if any.
HELIPORT (JCS, NATO) - A facility designated for operating, basing, servicing and maintaining helicopters.
HERTZ/Hz - The standard radio equivalent of frequency in cycles per second of an electromagnetic wave. Kilohertz (kHz) is frequency of one thousand cycles per second. Megahertz (MHz) is a frequency of one million cycles per second.
HIGH FREQUENCY COMMUNICATION/HF COMMUNICATION - High radio frequency (HF) between 3 and 30 Megahertz used for air-to-ground voice communication in overseas Operations.
HIGH FREQUENCY/HF - The frequency band between 3 and 30 Megahertz. (See High Frequency Communication)
HIGH-LEVEL AIR ROUTE, CANADA (CANADIAN FLIP GPH 204) - In high-level airspace, a prescribed track between specified radio aids to navigation, along which Air Traffic Control service is not provided.
HIGH-LEVEL AIRWAY, CANADA (CANADIAN FLIP GPH 204) - In controlled high level airspace, a prescribed track between specified radio aids to navigation, along which Air Traffic Control service is provided.
HIGH SPEED TAXIWAY/EXIT/TURNOFF - A long radius taxiway designed and provided with lighting or marking to define the path of aircraft, traveling at high speed (up to 60 knots), from the runway center to a point on the center of a taxiway. Also reference to a long radius exit or turnoff taxiway. The high speed taxiway is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.
HIWAS BROADCAST AREA (P/CG) - A geographical area of responsibility including one or more HIWAS outlet areas assigned to an AFSS/FSS for hazardous weather advisory broadcasting.
HIWAS OUTLET AREA (P/CG) - An area defined as a 150 NM radius of a HIWAS outlet, expanded as necessary to provide coverage.
HOLD FOR RELEASE - Used by Air Traffic Control to delay an aircraft for traffic management reasons; i.e., weather, traffic volume, etc. Hold for release instructions (including departure delay information) are used to inform a pilot or a controller (either directly or through an authorized relay) that a departure clearance is not valid until a release time or additional instructions have been received.
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