Acronyms
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I
| Acronym | Meaning | Source |
| IA | Inspection authorisation | FAR |
| IAC | Instrument approach chart (followed by name/title) | ICAO/AIP |
| IAF | Initial Approach Fix | AIS |
| IAL | Instrument Approach and Landing Chart | AIS |
| IAO | In and out of clouds | AIS |
| IAP | Instrument Approach Plate | |
| IAR | Intersection of air routes | ICAO |
| IAS | Indicated air speed | ICAO |
| IATA | International Air Transport Association | |
| IAW | In Accordance With | |
| IAWP | Initial Approach Way-point | AIS |
| IBN | Identification Beacon | AIS |
| IC | Ice Crystals (MET code) | AIS |
| ICA | Instructions for continuing airworthiness (issued by manufacturer or designer) | CAR 1998 |
| ICAO | International Civil Aviation Organization | ICAO |
| ICE | Icing, Ice | AIS |
| ICUS | In-command Under Supervision | |
| ID | Identifier, identify | AIS |
| IDENT | Identification | AIS |
| IF | Instrument Flight | |
| IF | Intermediate Approach Fix | AIS |
| IFF | Identification Friend/Foe | AIS |
| IFR | Instrument flight rules | ICAO/AIP |
| IFSD | In-flight Shutdown | |
| IG | Implementation Group | |
| IGA | International general aviation | /AIPICAO |
| ILS | Instrument Landing System | AIS |
| IM | Inner Marker | AIS |
| IMC | Instrument meteorological conditions (other than VMC) | CAR 1988 |
| IMC | Indirect Maintenance Cost | WATOG |
| IMG | Immigration | AIS |
| IMI | Interrogation sign | ICAO |
| IMPR | Improve, Improving, Improvement | AIS |
| IMT | Immediate, Immediately | AIS |
| INA | Initial approach | ICAO |
| INBD | Inbound | AIS |
| INC | In Cloud | AIS |
| INCERFA | Uncertainty Phase | AIS |
| INDEX | Integrated Data Exchange | |
| INFO | Information | AIS |
| INOP | Inoperative | AIS |
| INP | If not possible | ICAO |
| INPR | In progress | ICAO |
| INS | Inertial Navigation System | AIS |
| INSTL | Install, Installed, Installation | AIS |
| INSTR | Instrument | AIS |
| INT | Intersection | AIS |
| INTER | Intermittent, Intermittently (meteorological) | AIS |
| INTL | International | AIS |
| INTRG | Interrogator | AIS |
| INTRP | Interrupt, Interruption, Interrupted | AIS |
| INTSF | Intensify, Intensifying | AIS |
| INTST | Intensity | AIS |
| IoA | Instrument of appointment | CAR 1988 |
| IOC | Indirect Operating Cost | WATOG |
| IOE | Initial Operational Experience | |
| IPC | Illustrated Parts Catalogue | WATOG |
| IR | Ice on runway | ICAO |
| IREX | Instrument Training Examination | |
| IRM | Immediately Reportable Matters | |
| IRS | Internal Reporting System | |
| ISA | International Standard Atmosphere | AIS |
| ISB | Independent Sideband | AIS |
| ISG | CASA's Information Services Group | CASA |
| ISIM | Integrated Safety Investigation Methodology | |
| ISO9000 | International Organization for Standardization | |
| ISOL | Isolated | AIS |
| ITT | Interstage Turbine Temperature | |
| IWI | Illuminated Wind Indicator | AIS |
| IWP | Intermediate Way-point | AIS |