Pilot/Controller Glossary 

4/20/23 

INSTRUMENT RUNWAY [ICAO]

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 One of the following types of runways intended for the operation of aircraft 

using instrument approach procedures: 

a. 

Nonprecision Approach Runway

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 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

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 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

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 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

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 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. 

INTEGRATED DEPARTURE/ARRIVAL CAPABILITY (IDAC)

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 A Tower/TRACON departure scheduling 

capability within TBFM that allows departures to be scheduled into either an arrival flow or an en route flow. 

IDAC provides a mechanism for electronic coordination of departure release times. 
INTEGRITY

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 The ability of a system to provide timely warnings to users when the system should not be used 

for navigation. 
INTERMEDIATE APPROACH SEGMENT

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(See SEGMENTS OF AN INSTRUMENT APPROACH PROCEDURE.) 

INTERMEDIATE APPROACH SEGMENT [ICAO]

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 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

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 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

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 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

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 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 Chart Supplement U.S.) 

INTERNATIONAL AIRPORT [ICAO]

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 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. 

PCG I

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