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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.
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 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 ADVISORY SERVICE.)
HIWAS AREA-
(See HAZARDOUS
INFLIGHT WEATHER ADVISORY SERVICE.)
HIWAS BROADCAST AREA-
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-
An area defined as a 150 NM radius of a HIWAS outlet, expanded as
necessary to provide coverage.
HOLD FOR RELEASE-
Used by ATC 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 an
IFR departure clearance is not valid until a release time or
additional instructions have been received.
(See ICAO term HOLDING POINT.)
HOLD PROCEDURE- A
predetermined maneuver which keeps aircraft within a specified
airspace while awaiting further clearance from air traffic control.
Also used during ground operations to keep aircraft within a specified
area or at a specified point while awaiting further clearance from air
traffic control.
(See HOLDING FIX.)
(Refer to AIM.)
HOLDING FIX- A specified
fix identifiable to a pilot by NAVAIDs or visual reference to the
ground used as a reference point in establishing and maintaining the
position of an aircraft while holding.
(See FIX.)
(See
VISUAL HOLDING.)
(Refer to AIM.)
HOLDING POINT [ICAO]-
A specified location, identified by visual or other means, in the
vicinity of which the position of an aircraft in flight is maintained
in accordance with air traffic control clearances.
HOLDING PROCEDURE-
(See HOLD PROCEDURE.)
HOLD-SHORT POINT- A
point on the runway beyond which a landing aircraft with a LAHSO
clearance is not authorized to proceed. This point may be located
prior to an intersecting runway, taxiway, predetermined point, or
approach/departure flight path.
HOLD-SHORT
POSITION LIGHTS- Flashing in- pavement white lights located at
specified hold-short points.
HOLD-SHORT
POSITION MARKING- The painted runway marking located at the
hold-short point on all LAHSO runways.
HOLD-SHORT
POSITION SIGNS- Red and white holding position signs located
alongside the hold- short point.
HOMING- Flight
toward a NAVAID, without correcting for wind, by adjusting the
aircraft heading to maintain a relative bearing of zero degrees.
(See BEARING.)
(See ICAO term HOMING.)
HOMING [ICAO]- The
procedure of using the direction-finding equipment of one radio
station with the emission of another radio station, where at least one
of the stations is mobile, and whereby the mobile station proceeds
continuously towards the other station.
HOVER CHECK- Used to
describe when a helicopter/VTOL aircraft requires a stabilized hover
to conduct a performance/power check prior to hover taxi, air taxi, or
takeoff. Altitude of the hover will vary based on the purpose of the
check.
HOVER TAXI- Used to
describe a helicopter/VTOL aircraft movement conducted above the
surface and in ground effect at airspeeds less than approximately 20
knots. The actual height may vary, and some helicopters may require
hover taxi above 25 feet AGL to reduce ground effect turbulence or
provide clearance for cargo slingloads.
(See AIR
TAXI.)
(See HOVER CHECK.)
(Refer to AIM.)
HOW DO YOU HEAR
ME?- A question relating to the quality of the
transmission or to determine how well the transmission is being
received.
HZ-
(See HERTZ.)
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