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Aeronautical Information Manual (AIM), page 653

12/10/15 Pilot/Controller Glossary

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 ADVISO-
RY 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 meteorologi-
cal 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 wide-
spread 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 conjunc-
tion with all straight-in minimums.
(See DECISION HEIGHT.)
(See MINIMUM DESCENT ALTITUDE.)
HELICOPTER- A heavier-than-air aircraft sup-
ported 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/take-
off 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.
HIGH FREQUENCY- The frequency band between
3 and 30 MHz.
(See HIGH FREQUENCY COMMUNICATIONS.)


PCG H-1

Page 653 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

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