Pilot/Controller Glossary

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 a 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-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.)

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.