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Pilot/Controller Glossary

3/29/18

PCG I−1

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 ice accumulation is such

that ice protection systems fail to remove the

accumulation of ice, or ice accumulates in locations

not normally prone to icing, such as areas aft of

protected surfaces and any other areas identified by

the manufacturer.  Immediate exit from the condition

is necessary.

Note:

Severe icing is aircraft dependent, as are the other

categories of icing intensity.  Severe icing may

occur at any ice accumulation rate.

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.)

IDENTIFICATION [ICAO]− The situation which

exists when the position indication of a particular

aircraft is seen on a situation display and positively

identified.
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.)