Pilot/Controller Glossary

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.)

HIGH UPDATE RATE SURVEILLANCE" A surveillance system that provides a sensor update rate of less than
4.8 seconds.
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-IN-LIEU OF PROCEDURE TURN- A hold-in-lieu of procedure turn shall be established over a final
or intermediate fix when an approach can be made from a properly aligned holding pattern. The hold-in-lieu
of procedure turn permits the pilot to align with the final or intermediate segment of the approach and/or descend
in the holding pattern to an altitude that will permit a normal descent to the final approach fix altitude. The
hold-in-lieu of procedure turn is a required maneuver (the same as a procedure turn) unless the aircraft is being
radar vectored to the final approach course, when "NoPT" is shown on the approach chart, or when the pilot
requests or the controller advises the pilot to make a "straight-in" approach.
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.)