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. Deicing/anti-icing equipment is not utilized unless encountered for
an extended period of time (over 1 hour).
b. Light- The rate
of accumulation may create a problem if flight is prolonged in this environment
(over 1 hour). Occasional use of deicing/anti-icing equipment removes/prevents
accumulation. It does not present a problem if the deicing/anti-icing equipment
is used.
c. Moderate- The
rate of accumulation is such that even short encounters become potentially
hazardous and use of deicing/anti-icing equipment or flight diversion is
necessary.
d. Severe- The rate
of accumulation is such that deicing/anti-icing equipment fails to reduce or
control the hazard. Immediate flight diversion is necessary.
IDENT- A
request for a pilot to activate the aircraft transponder identification feature.
This will help the controller to confirm an aircraft identity or to identify an
aircraft.
(Refer to AIM.)
IDENT FEATURE- The special
feature in the Air Traffic Control Radar Beacon System (ATCRBS) equipment. It is
used to immediately distinguish one displayed beacon target from other beacon
targets.
(See IDENT.)
IF-
(See INTERMEDIATE FIX.)
IFIM-
(See INTERNATIONAL FLIGHT
INFORMATION MANUAL.)
IF NO TRANSMISSION
RECEIVED FOR (TIME)- Used by ATC in radar approaches to prefix
procedures which should be followed by the pilot in event of lost
communications.
(See LOST COMMUNICATIONS.)
IFR-
(See INSTRUMENT FLIGHT
RULES.)
IFR AIRCRAFT- An aircraft
conducting flight in accordance with instrument flight rules.
IFR CONDITIONS- Weather
conditions below the minimum for flight under visual flight rules.
(See INSTRUMENT
METEOROLOGICAL CONDITIONS.)
IFR DEPARTURE PROCEDURE-
(See IFR TAKEOFF MINIMUMS AND
DEPARTURE PROCEDURES.)
(Refer to AIM.)
IFR FLIGHT-
(See IFR AIRCRAFT.)
IFR LANDING MINIMUMS-
(See LANDING MINIMUMS.)
IFR MILITARY TRAINING
ROUTES (IR)- Routes used by the Department of Defense and associated Reserve and
Air Guard units for the purpose of conducting low-altitude navigation and
tactical training in both IFR and VFR weather conditions below 10,000 feet MSL
at airspeeds in excess of 250 knots IAS.
IFR TAKEOFF MINIMUMS AND
DEPARTURE PROCEDURES- Title 14 Code of Federal Regulations Part 91, prescribes
standard takeoff rules for certain civil users. At some airports, obstructions
or other factors require the establishment of nonstandard takeoff minimums,
departure procedures, or both to assist pilots in avoiding obstacles during
climb to the minimum en route altitude. Those airports are listed in FAA/DOD
Instrument Approach Procedures (IAPs) Charts under a section entitled "IFR
Takeoff Minimums and Departure Procedures." The FAA/DOD IAP chart legend
illustrates the 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.
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 route structure. There
are two types of DP, Obstacle Departure Procedure (ODP), printed either
textually or graphically, and, Standard Instrument Departure (SID), which is
always printed graphically.
(See IFR TAKEOFF MINIMUMS AND
DEPARTURE PROCEDURES.)
(See OBSTACLE DEPARTURE
PROCEDURES.)
(See STANDARD INSTRUMENT
DEPARTURES.)
(Refer to AIM.)
INSTRUMENT DEPARTURE
PROCEDURE (DP) CHARTS-
(See AERONAUTICAL CHART.)
INSTRUMENT FLIGHT RULES-
Rules governing the procedures for conducting instrument flight. Also a term
used by pilots and controllers to indicate type of flight plan.
(See INSTRUMENT
METEOROLOGICAL CONDITIONS.)
(See VISUAL FLIGHT RULES.)
(See VISUAL METEOROLOGICAL
CONDITIONS.)
(See ICAO term INSTRUMENT
FLIGHT RULES.)
(Refer to AIM.)
INSTRUMENT FLIGHT RULES [ICAO]-
A set of rules governing the conduct of flight under instrument meteorological
conditions.
INSTRUMENT LANDING SYSTEM-
A precision instrument approach system which normally consists of the following
electronic components and visual aids:
a. Localizer.
(See LOCALIZER.)
b. Glideslope.
(See GLIDESLOPE.)
c. Outer Marker.
(See OUTER MARKER.)
d. Middle Marker.
(See MIDDLE MARKER.)
e. Approach Lights.
(See AIRPORT LIGHTING.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
INSTRUMENT METEOROLOGICAL
CONDITIONS- Meteorological conditions expressed in terms of visibility, distance
from cloud, and ceiling less than the minima specified for visual meteorological
conditions.
(See INSTRUMENT FLIGHT
RULES.)
(See VISUAL FLIGHT RULES.)
(See VISUAL METEOROLOGICAL
CONDITIONS.)
INSTRUMENT RUNWAY- A
runway equipped with electronic and visual navigation aids for which a precision
or nonprecision approach procedure having straight-in landing minimums has been
approved.
(See ICAO term INSTRUMENT
RUNWAY.)
INSTRUMENT RUNWAY [ICAO]-
One of the following types of runways intended for the operation of aircraft
using instrument approach procedures:
a. Nonprecision
Approach Runway-An instrument runway served by visual aids and a nonvisual aid
providing at least directional guidance adequate for a straight-in approach.
b. Precision
Approach Runway, Category I-An instrument runway served by ILS and visual aids
intended for operations down to 60 m (200 feet) decision height and down to an
RVR of the order of 800 m.
c. Precision
Approach Runway, Category II-An instrument runway served by ILS and visual aids
intended for operations down to 30 m (100 feet) decision height and down to an
RVR of the order of 400 m.
d. Precision
Approach Runway, Category III-An instrument runway served by ILS to and along
the surface of the runway and:
1. Intended for
operations down to an RVR of the order of 200 m (no decision height being
applicable) using visual aids during the final phase of landing;
2. Intended for
operations down to an RVR of the order of 50 m (no decision height being
applicable) using visual aids for taxiing;
3. Intended for
operations without reliance on visual reference for landing or taxiing.
Note 1: See Annex 10
Volume I, Part I, Chapter 3, for related ILS specifications.
Note 2: Visual aids need
not necessarily be matched to the scale of nonvisual aids provided. The
criterion for the selection of visual aids is the conditions in which operations
are intended to be conducted.
INTEGRITY- The ability of
a system to provide timely warnings to users when the system should not be used
for navigation.
INTERMEDIATE APPROACH
SEGMENT-
(See SEGMENTS OF AN
INSTRUMENT APPROACH PROCEDURE.)
INTERMEDIATE APPROACH
SEGMENT [ICAO]- That segment of an instrument approach procedure between either
the intermediate approach fix and the final approach fix or point, or between
the end of a reversal, race track or dead reckoning track procedure and the
final approach fix or point, as appropriate.
INTERMEDIATE FIX- The fix
that identifies the beginning of the intermediate approach segment of an
instrument approach procedure. The fix is not normally identified on the
instrument approach chart as an intermediate fix (IF).
(See SEGMENTS OF AN
INSTRUMENT APPROACH PROCEDURE.)
INTERMEDIATE LANDING- On
the rare occasion that this option is requested, it should be approved. The
departure center, however, must advise the ATCSCC so that the appropriate delay
is carried over and assigned at the intermediate airport. An intermediate
landing airport within the arrival center will not be accepted without
coordination with and the approval of the ATCSCC.
INTERNATIONAL AIRPORT-
Relating to international flight, it means:
a. An
airport of entry which has been designated by the Secretary of Treasury or
Commissioner of Customs as an international airport for customs service.
b. A landing rights
airport at which specific permission to land must be obtained from customs
authorities in advance of contemplated use.
c. Airports
designated under the Convention on International Civil Aviation as an airport
for use by international commercial air transport and/or international general
aviation.
(See ICAO term INTERNATIONAL
AIRPORT.)
(Refer to AIRPORT/FACILITY
DIRECTORY.)
(Refer to IFIM.)
INTERNATIONAL AIRPORT [ICAO]-
Any airport designated by the Contracting State in whose territory it is
situated as an airport of entry and departure for international air traffic,
where the formalities incident to customs, immigration, public health, animal
and plant quarantine and similar procedures are carried out.
INTERNATIONAL CIVIL
AVIATION ORGANIZATION [ICAO]- A specialized agency of the United Nations whose
objective is to develop the principles and techniques of international air
navigation and to foster planning and development of international civil air
transport.
a. Regions include:
1. African-Indian
Ocean Region
2. Caribbean Region
3. European Region
4. Middle East/Asia
Region
5. North American
Region
6. North Atlantic
Region
7. Pacific Region
8. South American
Region
INTERNATIONAL FLIGHT
INFORMATION MANUAL- A publication designed primarily as a pilot's preflight
planning guide for flights into foreign airspace and for flights returning to
the U.S. from foreign locations.
INTERROGATOR- The
ground-based surveillance radar beacon transmitter-receiver, which normally
scans in synchronism with a primary radar, transmitting discrete radio signals
which repetitiously request all transponders on the mode being used to reply.
The replies received are mixed with the primary radar returns and displayed on
the same plan position indicator (radar scope). Also, applied to the airborne
element of the TACAN/DME system.
(See TRANSPONDER.)
(Refer to AIM.)
INTERSECTING RUNWAYS- Two
or more runways which cross or meet within their lengths.
(See INTERSECTION.)
INTERSECTION-
a. A point defined
by any combination of courses, radials, or bearings of two or more navigational
aids.
b. Used to describe
the point where two runways, a runway and a taxiway, or two taxiways cross or
meet.
INTERSECTION DEPARTURE- A
departure from any runway intersection except the end of the runway.
(See INTERSECTION.)
INTERSECTION TAKEOFF-
(See INTERSECTION DEPARTURE.)
IR-
(See IFR MILITARY TRAINING
ROUTES.)
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