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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 inpavement
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 holdshort
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
8/5/04 Pilot/Controller Glossary
PCG H−3
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.)

2/19/04 Pilot/Controller Glossary
PCG I−1
I
I SAY AGAIN− The message will be repeated.
IAF−
(See INITIAL APPROACH FIX.)
IAP−
(See INSTRUMENT APPROACH
PROCEDURE.)
IAWP− Initial Approach Waypoint
ICAO−
(See ICAO Term INTERNATIONAL CIVIL
AVIATION ORGANIZATION.)
ICING− The accumulation of airframe ice.
Types of icing are:
a. Rime Ice− Rough, milky, opaque ice formed by
the instantaneous freezing of small supercooled
water droplets.
b. Clear Ice− A glossy, clear, or translucent ice
formed by the relatively slow freezing or large
supercooled water droplets.
c. Mixed− A mixture of clear ice and rime ice.
Intensity of icing:
a. Trace− Ice becomes perceptible. Rate of accumulation
is slightly greater than the rate of sublimation.
　
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