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Pilot/Controller Glossary

3/29/18

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 ADVISO-

RY SERVICE (HIWAS)− 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 (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 14 CFR 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 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− 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.)