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700 feet.
b. IIIB.−An ILS approach procedure which provides
for approach without a decision height
minimum and with runway visual range of not less
than 150 feet.
c. IIIC.−An ILS approach procedure which provides
for approach without a decision height minimum
and without runway visual range minimum.
ILS PRM APPROACH− An instrument landing
system (ILS) approach conducted to parallel runways
whose extended centerlines are separated by less than
4,300 feet and the parallel runways have a Precision
Runway Monitoring (PRM) system that permits
simultaneous independent ILS approaches.
IM−
(See INNER MARKER.)
IMC−
(See INSTRUMENT METEOROLOGICAL
CONDITIONS.)
IMMEDIATELY− Used by ATC or pilots when such
action compliance is required to avoid an imminent
situation.
INCERFA (Uncertainty Phase) [ICAO]− A situation
wherein uncertainty exists as to the safety of an
aircraft and its occupants.
INCREASE SPEED TO (SPEED)−
(See SPEED ADJUSTMENT.)
INERTIAL NAVIGATION SYSTEM− An RNAV
system which is a form of self-contained navigation.
(See Area Navigation/RNAV.)
INFLIGHT REFUELING−
(See AERIAL REFUELING.)
INFLIGHT WEATHER ADVISORY−
(See WEATHER ADVISORY.)
INFORMATION REQUEST− A request originated
by an FSS for information concerning an overdue
VFR aircraft.
INITIAL APPROACH FIX− The fixes depicted on
instrument approach procedure charts that identify
the beginning of the initial approach segment(s).
(See FIX.)
(See SEGMENTS OF AN INSTRUMENT
APPROACH PROCEDURE.)
INITIAL APPROACH SEGMENT−
(See SEGMENTS OF AN INSTRUMENT
APPROACH PROCEDURE.)
INITIAL APPROACH SEGMENT [ICAO]− That
segment of an instrument approach procedure
8/5/04 Pilot/Controller Glossary
PCG I−3
between the initial approach fix and the intermediate
approach fix or, where applicable, the final approach
fix or point.
INLAND NAVIGATION FACILITY− A navigation
aid on a North American Route at which the common
route and/or the noncommon route begins or ends.
INNER MARKER− A marker beacon used with an
ILS (CAT II) precision approach located between the
middle marker and the end of the ILS runway,
transmitting a radiation pattern keyed at six dots per
second and indicating to the pilot, both aurally and
visually, that he/she is at the designated decision
height (DH), normally 100 feet above the touchdown
zone elevation, on the ILS CAT II approach. It also
marks progress during a CAT III approach.
(See INSTRUMENT LANDING SYSTEM.)
(Refer to AIM.)
INNER MARKER BEACON−
(See INNER MARKER.)
INREQ−
(See INFORMATION REQUEST.)
INS−
(See INERTIAL NAVIGATION SYSTEM.)
INSTRUMENT APPROACH−
(See INSTRUMENT APPROACH
PROCEDURE.)
INSTRUMENT APPROACH PROCEDURE− A
series of predetermined maneuvers for the orderly
transfer of an aircraft under instrument flight conditions
from the beginning of the initial approach to a
landing or to a point from which a landing may be
made visually. It is prescribed and approved for a
specific airport by competent authority.
(See SEGMENTS OF AN INSTRUMENT
APPROACH PROCEDURE.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
a. U.S. civil standard instrument approach procedures
are approved by the FAA as prescribed under
14 CFR Part 97 and are available for public use.
b. U.S. military standard instrument approach
procedures are approved and published by the
Department of Defense.
c. Special instrument approach procedures are
approved by the FAA for individual operators but are
not published in 14 CFR Part 97 for public use.
(See ICAO term INSTRUMENT APPROACH
PROCEDURE.)
INSTRUMENT APPROACH PROCEDURE
[ICAO]− A series of predetermined maneuvers by
reference to flight instruments with specified protection
from obstacles from the initial approach fix, or
where applicable, from the beginning of a defined
arrival route to a point from which a landing can be
completed and thereafter, if a landing is not completed,
to a position at which holding or en route
obstacle clearance criteria apply.
INSTRUMENT APPROACH PROCEDURES
CHARTS−
(See AERONAUTICAL CHART.)
INSTRUMENT DEPARTURE PROCEDURE
(DP)− A preplanned instrument flight rule (IFR)
departure procedure published for pilot use, in
graphic or textual format, that provides obstruction
clearance from the terminal area to the appropriate en
　
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