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Aeronautical Information Manual (AIM), page 659

5/26/16
12/10/15

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.

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.)

Pilot/Controller Glossary

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 OPERATIONS
[ICAO]* An approach and landing using instruments
for navigation guidance based on an instrument
approach procedure. There are two methods for
executing instrument approach operations:
a. A two-dimensional (2D) instrument approach
operation, using lateral navigation guidance only;
and
b. A three-dimensional (3D) instrument approach
operation, using both lateral and vertical navigation
guidance.
Note: Lateral and vertical navigation guidance
refers to the guidance provided either by:
a) a ground-based radio navigation aid; or
b) computer-generated navigation data from
ground-based, space-based, self-contained

navigation aids or a combination of these.
(See ICAO term INSTRUMENT APPROACH
PROCEDURE.)


PCG I-3

Page 659 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   658 -- Page 659 -- 660