2/14/08 Pilot/Controller Glossary
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 accumulation is such that
deicing/anti‐icing equipment fails to reduce or
control the hazard. Immediate flight diversion is
necessary.
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
Reserve and Air Guard units for the purpose of
conducting low‐altitude navigation and tactical
training in both IFR and VFR weather conditions
below 10,000 feet MSL at airspeeds in excess of 250
knots IAS.
IFR TAKEOFF MINIMUMS AND DEPARTURE
PROCEDURES- Title 14 Code of Federal
Pilot/Controller Glossary 2/14/08
PCG I-2
Regulations Part 91, prescribes standard takeoff rules
for certain civil users. At some airports, obstructions
or other factors require the establishment of
nonstandard takeoff minimums, departure procedures,
or both to assist pilots in avoiding obstacles
during climb to the minimum en route altitude. Those
airports are listed in FAA/DOD Instrument Approach
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