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Aeronautical Information Manual (AIM), page 657

5/26/16
12/10/15


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
Pilot/Controller Glossary

I
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.)
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.)

IFR LANDING MINIMUMS-
(See LANDING MINIMUMS.)
IFR MILITARY TRAINING ROUTES (IR)- Routes
used by the Department of Defense and associated

PCG I-1

Page 657 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   656 -- Page 657 -- 658