|
Definition
|
Contraction
|
Usage
|
|
ICAO
Middle East/Asia Region
|
MID/ASIA
|
ATC
|
|
ice
crystals (weather reports only)
|
IC
|
METAR
|
|
ice on
runway
|
IR
|
NWS
|
|
ice pellet
showers
|
SHPL
|
METAR
|
|
ice
pellets
|
PL
|
METAR
|
|
icing
|
ICG
|
NWS
|
|
icing
(PIREP only)
|
IC
|
ATC
|
|
icing in
clouds
|
ICGIC
|
NWS
|
|
icing in
clouds and precipitation
|
ICGICIP
|
NWS
|
|
icing in
precipitation
|
ICGIP
|
NWS
|
|
identification
|
ID
|
GEN
|
|
identification
beacon
|
IBN
|
ICAO
|
|
identification
friend/foe
|
IFF
|
ICAO
|
|
identify
or identifier or identification
|
IDENT
|
GEN
|
|
if
approach missed proceed
|
IFAMP
|
ATC
|
|
if
authorized by ATC, DME may be used
|
IAATCD
|
ATC
|
|
if flight
visibility becomes less than
|
IFVLS
|
ATC
|
|
if holding
|
IFHOL
|
ATC
|
|
if
incorrect advise
|
IIA
|
GEN
|
|
if
incorrect service direct
|
IISD
|
GEN
|
|
if
instrument conditions encountered
|
IFINS
|
ATC
|
|
if not off
|
INOF
|
GEN
|
|
if not
possible
|
INP
|
GEN
|
|
if unable
|
IFUN
|
GEN
|
|
if
visibility remains
|
IFVR
|
ATC
|
|
IFR
military training route
|
IR
|
GEN
|
|
ILSpartial
|
ILSP
|
GEN
|
|
immediate
|
IMDT
|
NWS
|
|
immediate
or immediately
|
IMT
|
GEN
|
|
immediately
after passing
|
IMAP
|
ATC
|
|
immigration
|
IMG
|
ICAO
|
|
important
|
IMPT
|
GEN
|
|
impracticable
|
IMP
|
GEN
|
|
improve
|
IMPR
|
ICAO
|
|
improve
|
IPV
|
GEN
|
|
impulse
|
IMPL
|
GEN
|
|
in
accordance with
|
IAW
|
GEN
|
|
in and out
of clouds
|
IAO
|
ICAO
|
|
in clouds
|
INC
|
ICAO
|
|
in
overcast
|
IOVC
|
NWS
|
|
in
progress
|
INPR
|
ICAO
|
|
in RVR
indicates visibility greater than highest reportable sensor value (e.g.
P600FT)
|
P
|
METAR
|
|
in RVR
indicates visibility less than lowest reportable sensor value (e.g. M600)
|
M
|
METAR
|
|
in
temperature field means “minus” or below zero
|
M
|
METAR
|
|
in the
vicinity of
|
INVOF
|
ATC
|
|
in valleys
|
VAL
|
ICAO
|
|
in VFR
conditions
|
IVFRC
|
ATC
|
|
inadequate
|
INADQT
|
GEN
|
|
inbound
|
IBND
|
ATC
|
|
inbound
|
INBD
|
ICAO
|
|
inbound
radial
|
IRAD
|
ATC
|
|
inch
|
IN
|
GEN
|
|
include
|
INCL
|
GEN
|
|
inclusive
|
INCLV
|
GEN
|
|
incomplete
|
INCOMP
|
GEN
|
|
incorporated
|
INC
|
GEN
|
|
incorrect
|
INCOR
|
GEN
|
|
increase
|
INCR
|
GEN
|
|
indefinite
|
INDEF
|
GEN
|
|
independent
sideband
|
ISB
|
ICAO
|
|
indicate
|
INDC
|
GEN
|
|
indicated
air speed
|
IAS
|
ATC
|
|
Indication
of a request
|
RQ
|
ICAO
|
|
individual
development plan
|
IDP
|
GEN
|
|
individual
flight plans from this point
|
IFPFP
|
ATC
|
|
industrial
|
INDUS
|
GEN
|
|
inertial
navigation system
|
INS
|
ICAO
|
|
information
|
INFO
|
GEN
|
|
information
request
|
INREQ
|
GEN
|
|
initial
approach
|
INA
|
ICAO
|
|
initial
approach fix
|
IAF
|
GEN
|
|
initial
point
|
IP
|
ATC
|
|
initial
point/Hhour control line
|
IP/HHCL
|
ATC
|
|
initial
training
|
INIT
|
GEN
|
|
inland
|
INLD
|
NWS
|
|
inland
|
LAN
|
ICAO
|
|
inland
navigation facility
|
INF
|
GEN
|
|
inner
marker
|
IM
|
GEN
|
|
inoperative
|
INOP
|
GEN
|
|
inspect
|
INSP
|
GEN
|
|
instability
|
INSTBY
|
NWS
|
|
install
|
INSTL
|
GEN
|
|
instruct
|
INSTR
|
GEN
|
|
instructor
pilot
|
IP
|
GEN
|
|
instrument
|
INST
|
GEN
|
|
instrument
|
INSTR
|
ICAO
|
|
instrument
approach chart (followed by name/title)
|
IAC
|
ICAO
|
|
instrument
approach procedure
|
IAP
|
GEN
|
|
instrument
flight rules
|
IFR
|
GEN
|
|
instrument
landing system
|
ILS
|
GEN
|
|
instrument
low approach
|
ILAS
|
ATC
|
|
instrument
meteorological conditions
|
IMC
|
GEN
|
|
instruments
authorized
|
INSTA
|
ATC
|
|
insufficient
scheduled time available
|
INSUF
|
GEN
|
|
intend
|
INTD
|
GEN
|
|
intense
|
INTS
|
NWS
|
|
intensify
|
INTSFY
|
NWS
|
|
intensify
or intensifying
|
INTSF
|
ICAO
|
|
intensity
|
INTST
|
GEN
|
|
Intensity
unknown (weather reports only)
|
IMI
|
ICAO
|
|
intensity
unknown (weather reports only)
|
U
|
NWS
|
|
intentions
|
INTNS
|
GEN
|
|
Interagency
Group on International Aviation
|
IGIA
|
GEN
|
|
intercept
|
INTCP
|
GEN
|
|
intercontinental
|
INTCNTL
|
GEN
|
|
Interdepartmental
Radio Advisory Committee
|
IRAC
|
GEN
|
|
Interface
Control Document
|
ICD
|
ATC
|
|
Interface
Revision Notices
|
IRN
|
ATC
|
|
interfacility
data
|
IDAT
|
GEN
|
|
interference
|
INTFC
|
GEN
|
|
interim
standard microwave landing system
|
ISMLS
|
GEN
|
|
interior
|
INTR
|
NWS
|
|
intermediate
|
INTMD
|
GEN
|
|
intermediate
approach fix
|
IF
|
ICAO
|
|
intermediate
fix
|
IF
|
GEN
|
|
intermittent
|
INTER
|
ICAO
|
|
intermittent
|
INTMT
|
GEN
|
|
intermittent
instruments
|
I/IFR
|
ATC
|
|
InterMountain
Region
|
INTRMTRGN
|
NWS
|
|
international
|
INTL
|
GEN
|
|
International
Administrative Aeronautical Radio Conference
|
IAARC
|
GEN
|
|
International
Aeronautical Telecommunications Switching Center
|
IATSC
|
GEN
|
|
International
Air Transport Association
|
IATA
|
GEN
|
|
International
Civil Aviation Organization
|