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 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 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 interna-tional 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 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-ly 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.