| IAC |
International Aerobatics Club |
| IADS |
Integrated air defence system |
| IAP |
International airport |
| IAS |
Indicated airspeed |
| IATA |
International Air Transport Association |
| ICAO |
International Civil Aviation Organization |
| ICBM |
Inter-continental ballistic missile |
| ICNIA |
Integrated Communications, Navigation and
Identification Avionics (USAF/USN) |
| ID |
Identification |
| IF |
Intermediate frequency |
| IFALPA |
International Federation of Air Line Pilots
Associations |
| IFE |
In-flight entertainment |
| IFF |
Identify friend or foe |
| IFR |
Instrument flight rules;
also: in-flight refueling |
| IGE |
In ground effect; refers to helicopter hovering
performance close to horizontal surface |
| IIR |
Imaging infra-red |
| IIRS |
Instrument inertial reference set |
| ILS |
Instrument landing system |
| IMC |
Instrument meteorological conditions |
| IMN |
Indicated Mach number |
| Imp gal |
Imperial gallon (= 1.201 US gallon; = 4.546
litres) |
| IMS |
Information management system;
also: integrated management system |
| INAS |
Integrated navigation/attack system |
| Inc |
Incorporated |
| incidence |
Angle at which wing is set to fore/aft axis of
aircraft |
| INEWS |
Integrated Electronic Warfare System (USAF/USN) |
| INF |
Intermediate range nuclear forces |
| ins |
Inches (= 2.54 cm) |
| INS |
Inertial navigation system; measures all
accelerations on aircraft; calculates present |
| |
position from known starting position using the
integration of accelerations&time |
| integral construction |
Construction machined from 1 part instead of
assembled from seperate parts |
| integral tank |
A (fuel) tank formed by sealing off part of the
aircraft structure |
| interdiction |
Attack on tactical targets deep inside enemy
territory |
| IP |
Instructor pilot; also:
intermediate pressure |
| IOC |
Initial operational capability |
| IOR |
Immediate operational requirement |
| IR |
Infra-red |
| IRAN |
Inspection and repair as necessary (US) |
| IRCM |
Infra-red countermeasures |
| IRCCM |
Infra-red counter countermeasures |
| IRLS |
Infra-red line scan |
| IRS |
Inertial reference system |
| IRST |
Infra-red search and track |
| IRU |
Inertial reference unit |
| IRWR |
Infra-red warning receiver |
| ISA |
International standard atmosphere |
| ISAR |
Inverted synthetic aperture radar |
| ISD |
In service date |
| ISO |
International Standardisation Organisation |
| ITP |
Intent to purchase; also:
instruction to proceed |
| ITT |
Invitation to tender |
| IVS |
Interactive voice system |
| IWS |
Integrated weapon system |