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I Say Again: The message will be repeated. (FAA4)

I/O: In-Port Operations (USCG5)

IACP: International Association of Chiefs of Police (NHTSA6)

IAD: Washington Dulles International Airport (FAA11)

IAEA: International Atomic Energy Agency (RSPA1)

IAF: Initial Approach Fix (FAA4)

IAH: Houston Intercontinental Airport (FAA11)

IAP: Instrument Approach Procedure (FAA4)

IAPA: Instrument Approach Procedures Automation (FAA19)

IAS: Indicated Airspeed (14CFR1)

IAT: Internal Air Transport (MTMC1)

IATA: International Air Transport Association (49CFR171)

IBC: Intermediate Bulk Container (49CFR171) (RSPA1)

IBTTA: International Bridge, Tunnel and Turnpike Association (FHWA11)

ICAO: International Civil Aviation Organization (FAA2) (FAA4) (FAA17) (FAA7) (FAA19) (FAA8)

ICBM: Inter-Continental Ballistic Missile (AIA1)

ICC: Intelligent Cruise Control (NHTSA5)

ICC: Interstate Commerce Commission (49CFR390) (BTS2)

ICE: Internal Combustion Engine (TRB1)

Ice Action On Bridge Piers: The force required to break ice, transmitted to bridge piers and other structures in the river. Such a force could damage the structures. (TNDOT1)

Ice Clause: A standard clause in the chartering of ocean vessels. It dictates the course a vessel master may take if the ship is prevented from entering the loading or discharging port because of ice, or if the vessel is threatened by ice while in the port. The clause establishes right and obligations of both vessel owner and charterer if these events occur. (USTTA1)

Ice Gorge: A conglomeration of ice solidly packed from bank to bank which is obstructing the flow of the river and marine traffic. (TNDOT1)

Ice Pier: A heavily constructed cluster of piling or concrete behind which towboats moor or shelter from running ice. (TNDOT1)

Ice Shelf: Seaward extension of an ice sheet, floating but attached to the land on at least one side and bounded on the seaward side by a steep cliff rising 2 to 50 m or more above sea level. (DOI3)

Iceberg: A large mass of detached land ice in the sea or stranded in shallow water. (DOI4)

ICHCA: International Cargo Handling Coordination Association (USTTA1)

ICMTO: Independent Carrier Military Traffic Office (MTMC1)

ICT: Wichita Mid - Continent Airport (FAA11)

IDEAS: Innovations Deserving Exploratory Analysis Program (FHWA15)

Ident: (See also Identification) 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. (FAA4)

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. (FAA4)

Identification: See also Ident.

Identification: The official legends "For Official Use Only" and "US Government," and other legends showing either the full name of the department, establishment, corporation, or agency by which it is used, if such title readily identifies the department, establishment, corporation, or agency concerned. (GSA2)

Identification Lamps: Lamps used to identify certain types of commercial motor vehicles. (49CFR393)

IDL: Interfacility Data Link (FAA8)

Idle Thrust: The jet thrust obtained with the engine power control level set at the stop for the least thrust position at which it can be placed. (14CFR1)

IEEE: Institute of Electrical and Electronics Engineers, Inc. (USCG1)

IF: Intermediate Fix (FAA4)

If No Transmission Received For (Time): Used by Air Traffic Control (ATC) in radar approaches to prefix procedures which should be followed by the pilot in event of lost communications. (FAA4)

IFCN: Inter-Facility Flow Control Network (FAA17)

IFEA: In-Flight Emergency Assistance (FAA8)

IFMS: Interagency Fleet Management System (GSA1)

IFR: Interim Final Rule (RSPA1)

IFS: Inflight Survey (USTTA1)

IFSS: International Flight Service Station (FAA2) (FAA19) (FAA14) (FAA13)

IFTA: International Fuel Tax Agreement (FHWA10)

IGOR: Interactive Guidance On Routes (FHWA15)

IIA: Independent Inspection Agency (RSPA1)

ILA: International Longshoremen's Association (MARAD4)

ILEV: Inherently Low Emission Vehicle (VDOT)

ILS: Instrument Landing System (FAA2) (FAA4) (FAA17) (FAA7) (FAA19) (FAA8)

ILWU: International Longshoremen's and Warehousemen's Union (MARAD4)

IM: Inner Marker (FAA4)

IMA: Individual Mobilization Augmentee (MTMC1)

IMC: Instrument Meteorological Conditions (FAA4) (FAA17) (FAA6) (FAA19)

IMCO: Intergovernmental Maritime Consultative Organization (MTMC1)

IMDGC: International Maritime Dangerous Goods Code (MTMC1)

IMG: International Maintenance Group (FAA7)

Immediately: Used by Air Traffic Control (ATC) when such action compliance is required to avoid an imminent situation. (FAA4)

IMO: International Maritime Organization (MARAD4) (RSPA1)

Imports: Receipts of goods into the 50 States and the District of Columbia from foreign countries and from Puerto Rico, the Virgin Islands, and other U.S. possessions and territories. (DOE3)

Impounding Space: A volume of space formed by dikes and floors which is designed to confine a spill of hazardous liquid. (49CFR193)

Impounding System: Includes an impounding space, including dikes and floors for conducting the flow of spilled hazardous liquids to an impounding space. (49CFR193)

Improper Loading: Loading, including weight shifting, of a vessel causing instability, limited maneuverability, or dangerously reduced freeboard. (USCG2)

Improper Lookout: No proper watch; the failure of the operator to perceive danger because no one was serving as lookout, or the person so serving failed in that regard. (USCG2)

IMS: Intermodal Management System (VDOT)

In Bulk: The transportation, as cargo, of property, except Class A and B explosives and poison gases, in containment systems with capacities in excess of 3,500 water gallons. (49CFR387)

In Draft: Current moving across the lock entrance toward the shore. (TNDOT1)

In Shape: Term used when a tow is properly aligned for entering a lock or passing through a narrow channel or opening between bridge piers. (TNDOT1)

In the Marks: Proceeding along the channel line as described in the channel report. Well on the line (imaginary) running from one mark to the other or from one light to the other. (TNDOT1)

In-Out Racks: Dry land boat storage on a vertical rack system. (BOC2)

In-Use Mile Per Gallon (MPG): A Miles Per Gallon (MPG) that was adjusted for seasonality and annual miles traveled. (DOE4) (DOE5)

Inactive Aircraft: All legally registered civil aircraft which flew zero hours. (FAA2) (FAA9)

Inboard-Outboard: Also referred to as inboard/outdrive. Regarded as inboard because the power unit is located inside the boat. (USCG2)

Incerfa (Uncertainty Phase): A situation wherein uncertainty exists as to the safety of an aircraft and its occupants. (FAA4)

Incident: See also, Accident, Casualty, Collision, Crash, Derailment, Event, Fatality, Injury, Truck Crash.

Incident: Collisions, derailments, personal casualties, fires, and property damage in excess of $1000, associated with transit agency revenue vehicles; all other facilities on the transit property; and service vehicles, maintenance areas and rights-of-way (ROW). (FTA1) (FTA2)

Incident Reporting Thresholds: For an incident to be reportable, it must involve a transit vehicle or occur on transit property, and result in death, injury, or property damage in excess of $1,000. (FTA1)

Incline Railway: Railway used to traverse steep slopes. (DOI3)

Inclined Plane: A railway operating over exclusive right-of-way on steep grades with unpowered vehicles propelled by moving cables attached to the vehicles and powered by engines or motors at a central location not on board the vehicle. (APTA1)

Inclined Plane Vehicles: Special type of passenger vehicles operating up and down slopes on rails via a cable mechanism. (FTA1)

Income Taxes For the Period: Provisions for Federal, State, local and foreign taxes, which are based upon net income. (BTS4)

IND: Indianapolis International Airport (FAA11)

Independent Surveillance: A system which requires no airborne compatible equipment. (FAA8)

Indicated Airspeed: The speed of an aircraft as shown on its pitot static airspeed indicator calibrated to reflect standard atmosphere adiabatic compressible flow at sea level uncorrected for airspeed system errors. (14CFR1)

Indication: The information conveyed by the aspect of a signal. (49CFR236)

Indication Locking: [with respect to rail operations] Electric locking which prevents manipulation of levers that would result in an unsafe condition for a train movement if a signal, switch, or other operative unit fails to make a movement corresponding to that of its controlling lever, or which directly prevents the operation of a signal, switch, or other operative unit, in case another unit which should operate first fails to make the required movement. (49CFR236)

Indirect Employment: In respect to waterways industry not necessarily engaged directly in river activities, but dependent upon the river. (TNDOT1)

Inductor: A track element consisting of a mass of iron, with or without a winding, that simulates the train control, train stop, or cab signal mechanisms on the rail vehicle. (TRB1)

Industrial Sector: Construction, manufacturing, agricultural and mining establishments. (DOE6)

Industrial Special: Any use of an aircraft for specialized work allied with industrial activity, excluding transportation and aerial application eg. pipeline patrol, survey, advertising, photography, helicopter hoist, etc. (FAA10)

Industrial Terminal: A specialized terminal whose primary purpose is manufacturing, not transportation services. (TNDOT1)

Industrial Track: A switching track serving industries, such as mines, mills smelters, and factories. (49CFR245)

Industry Briefing: Appearance of Coast Guard standards trained personnel before a gathering of boat and\or associated equipment manufacturers and/or dealers. (USCG1)

Industry Track: A switching track, or series of tracks, serving the needs of a commercial industry other than a railroad. (FRA2)

Inertial Navigation System: An Area Navigation (RNAV) system which is a form of self-contained navigation. (FAA4)

Inflight Survey (IFS): The Inflight Survey is administered to United States (U.S.) and foreign travelers departing the U.S. as a means of providing data on visitor characteristics, travel patterns and spending habits, and for supplying data on the U.S. international travel dollar accounts as well as to meet balance of payments estimation needs. The Inflight Survey (IFS) covers about 70% of U.S. carriers and 35% of foreign carriers who voluntarily choose to participate. (USTTA1)

Informal Factory Visit: A visit by Coast Guard personnel to a manufacturing facility to acquaint the manufacturer with the existence of the law, regulations, general administrative requirements affecting him, and possible penalties for violations. (USCG1)

Information Request: A request originated by an Flight Service Station (FSS) for information concerning an overdue Visual Flight Rules (VFR) aircraft. (FAA4)