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
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
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
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
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
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 interna-
tional 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
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 interna-
tional general aviation.
(See ICAO term INTERNATIONAL AIRPORT.)
(Refer to Chart Supplement U.S.)
(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 ORGA-
NIZATION [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 repetitious-