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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 2/19/04
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
Procedures (IAPs) Charts under a section entitled
“IFR Takeoff Minimums and Departure Procedures.”
The FAA/DOD IAP chart legend illustrates the
symbol used to alert the pilot to nonstandard takeoff
minimums and departure procedures. When departing
IFR from such airports or from any airports where
there are no departure procedures, DPs, or ATC
facilities available, pilots should advise ATC of any
departure limitations. Controllers may query a pilot
to determine acceptable departure directions, turns,
or headings after takeoff. Pilots should be familiar
with the departure procedures and must assure that
their aircraft can meet or exceed any specified climb
gradients.
IF/IAWP− Intermediate Fix/Initial Approach Waypoint.
The waypoint where the final approach course
of a T approach meets the crossbar of the T. When
designated (in conjunction with a TAA) this waypoint
will be used as an IAWP when approaching the
airport from certain directions, and as an IFWP when
beginning the approach from another IAWP.
IFWP− Intermediate Fix Waypoint
ILS−
(See INSTRUMENT LANDING SYSTEM.)
ILS CATEGORIES− 1. ILS Category I. An ILS
approach procedure which provides for approach to
a height above touchdown of not less than 200 feet
and with runway visual range of not less than 1,800
feet.− 2. ILS Category II. An ILS approach procedure
which provides for approach to a height above
touchdown of not less than 100 feet and with runway
visual range of not less than 1,200 feet.− 3. ILS
Category III:
a. IIIA.−An ILS approach procedure which provides
for approach without a decision height minimum
and with runway visual range of not less than
　
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