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Pilot/Controller Glossary

3/29/18

PCG I−6

4. Middle East/Asia Region
5. North American Region
6. North Atlantic Region
7. Pacific Region
8. South American Region

INTERNATIONAL FLIGHT INFORMATION

MANUAL (IFIM)− A publication designed primari-

ly 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.

(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.)

IRREGULAR SURFACE− A surface that is open for

use but not per regulations.
ISR−

(See INCREASED SEPARATION REQUIRED.)