IAC | Instrument approach chart (followed by name/title) |
IAF | Initial approach fix |
IAO | In and out of clouds |
IAP | Instrument approach procedure |
IAR | Intersection of air routes |
IAS | Indicated air speed |
IATA | International Air Transport Association |
IBN | Identification beacon |
IC | Ice crystals (very small ice crystals in suspension, also known as diamond dust) |
ICAO | International Civil Aviation Organization |
ICE | Icing |
ID | Identifier or identify |
IDENT | Identification |
IF | Intermediate approach fix |
IFPS | Initial Flight Plan Processing System |
IFR | Instrument flight rules |
IGA | International general aviation |
ILS | Instrument landing system |
IM | Inner marker |
IMC | Instrument meteorological conditions |
IMG | Immigration |
IMPR | Improve or improving |
IMT | Immediate or immediately |
INA | Initial approach |
INBD | Inbound |
INC | In cloud |
INCERFA | Uncertainty phase |
INFO | Information |
INOP | Inoperative |
INP | If not possible |
INPR | In progress |
INS | Inertial navigation system |
INSTL | Install or installed or installation |
INSTR | Instrument |
INT | Intersection |
INTL | International |
INTRG | Interrogator |
INTRP | Interrupt or interruption or interrupted |
INTSF | Intensify or intensifying |
INTST | Intensity |
IR | Ice on runway |
ISA | International standard atmosphere |
ISO | International organisation for standartisation |
ISOL | Isolated |