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symbol used to alert the pilot to nonstandard takeoff
minimums and departure procedures. When departing
IFR from such airports or from any airports where
there are no departure procedures, DPs, or ATC
facilities available, pilots should advise ATC of any
departure limitations. Controllers may query a pilot
to determine acceptable departure directions, turns,
or headings after takeoff. Pilots should be familiar
with the departure procedures and must assure that
their aircraft can meet or exceed any specified climb
gradients.
IF/IAWP- Intermediate Fix/Initial Approach Waypoint.
The waypoint where the final approach course
of a T approach meets the crossbar of the T. When
designated (in conjunction with a TAA) this
waypoint will be used as an IAWP when approaching
the airport from certain directions, and as an IFWP
when beginning the approach from another IAWP.
IFWP- Intermediate Fix Waypoint
ILS-
(See INSTRUMENT LANDING SYSTEM.)
ILS CATEGORIES- 1. ILS Category I. An ILS
approach procedure which provides for approach to
a height above touchdown of not less than 200 feet
and with runway visual range of not less than 1,800
feet.- 2. ILS Category II. An ILS approach procedure
which provides for approach to a height above
touchdown of not less than 100 feet and with runway
visual range of not less than 1,200 feet.- 3. ILS
Category III:
a. IIIA.-An ILS approach procedure which
provides for approach without a decision height
minimum and with runway visual range of not less
than 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
between the initial approach fix and the intermediate
approach fix or, where applicable, the final approach
fix or point.
2/14/08 Pilot/Controller Glossary
PCG I-3
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
　
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