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GROUND VISIBILITY−
(See VISIBILITY.)
GS−
(See GROUND STOP.)
8/5/04 Pilot/Controller Glossary
PCG H−1
H
HAA−
(See HEIGHT ABOVE AIRPORT.)
HAL−
(See HEIGHT ABOVE LANDING.)
HANDOFF− An action taken to transfer the radar
identification of an aircraft from one controller to
another if the aircraft will enter the receiving
controller’s airspace and radio communications with
the aircraft will be transferred.
HAR−
(See HIGH ALTITUDE REDESIGN.)
HAT−
(See HEIGHT ABOVE TOUCHDOWN.)
HAVE NUMBERS− Used by pilots to inform ATC
that they have received runway, wind, and altimeter
information only.
HAZARDOUS INFLIGHT WEATHER ADVISORY
SERVICE− Continuous recorded hazardous
inflight weather forecasts broadcasted to airborne
pilots over selected VOR outlets defined as an
HIWAS BROADCAST AREA.
HAZARDOUS WEATHER INFORMATION−
Summary of significant meteorological information
(SIGMET/WS), convective significant meteorological
information (convective SIGMET/WST), urgent
pilot weather reports (urgent PIREP/UUA), center
weather advisories (CWA), airmen’s meteorological
information (AIRMET/WA) and any other weather
such as isolated thunderstorms that are rapidly
developing and increasing in intensity, or low
ceilings and visibilities that are becoming widespread
which is considered significant and are not
included in a current hazardous weather advisory.
HEAVY (AIRCRAFT)−
(See AIRCRAFT CLASSES.)
HEIGHT ABOVE AIRPORT− 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− The height above a
designated helicopter landing area used for helicopter
instrument approach procedures.
(Refer to 14 CFR Part 97.)
HEIGHT ABOVE TOUCHDOWN− The height of
the Decision Height or Minimum Descent Altitude
above the highest runway elevation in the touchdown
zone (first 3,000 feet of the runway). HAT is
published on instrument approach charts in conjunction
with all straight-in minimums.
(See DECISION HEIGHT.)
(See MINIMUM DESCENT ALTITUDE.)
HELICOPTER− Rotorcraft that, for its horizontal
motion, depends principally on its engine-driven
rotors.
(See ICAO term HELICOPTER.)
HELICOPTER [ICAO]− A heavier-than-air aircraft
supported in flight chiefly by the reactions of the air
on one or more power-driven rotors on substantially
vertical axes.
HELIPAD− A small, designated area, usually with a
prepared surface, on a heliport, airport, landing/takeoff
area, apron/ramp, or movement area used for
takeoff, landing, or parking of helicopters.
HELIPORT− An area of land, water, or structure used
or intended to be used for the landing and takeoff of
helicopters and includes its buildings and facilities if
any.
HELIPORT REFERENCE POINT (HRP)− The
geographic center of a heliport.
HERTZ− The standard radio equivalent of frequency
in cycles per second of an electromagnetic wave.
Kilohertz (KHz) is a frequency of one thousand
cycles per second. Megahertz (MHz) is a frequency
of one million cycles per second.
HF−
(See HIGH FREQUENCY.)
HF COMMUNICATIONS−
(See HIGH FREQUENCY COMMUNICATIONS.)
HIGH ALTITUDE REDESIGN (HAR)− A level of
non−restrictive routing (NRR) service for aircraft
that have all waypoints associated with the HAR
program in their flight management systems or
RNAV equipage.
Pilot/Controller Glossary 8/5/04
PCG H−2
HIGH FREQUENCY− The frequency band between
3 and 30 MHz.
(See HIGH FREQUENCY COMMUNICATIONS.)
HIGH FREQUENCY COMMUNICATIONS− High
radio frequencies (HF) between 3 and 30 MHz used
for air-to-ground voice communication in overseas
operations.
HIGH SPEED EXIT−
(See HIGH SPEED TAXIWAY.)
HIGH SPEED TAXIWAY− 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 referred to as long radius
exit or turn-off taxiway. The high speed taxiway is
designed to expedite aircraft turning off the runway
after landing, thus reducing runway occupancy time.
HIGH SPEED TURNOFF−
(See HIGH SPEED TAXIWAY.)
HIWAS−
(See HAZARDOUS INFLIGHT WEATHER
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