Open or opening or opened
OPR Operator or operate or operative or operating or operational
OPS Operations
O/R On request
ORCAM Originating Region Code Assignment Method
OTP On top
P
P… Prohibited area (followed by identification)
PANS Procedures for air navigation services
PAPI Precision Approach Path Indicator
PAR Precision Approach Radar system
PCN Pavement classification number
PDG Procedure design gradient
PERM Permanent
PJE Parachute jumping exercise
PL Ice pellets
PLA Practice low approach
PLN Flight plan
PN Prior notice required
PO Dust/sand whirls (dust devils)
POB Persons on board
PPI Plan position indicator
PPR Prior permission required
PRFG Aerodrome partially covered by fog
PRKG Parking
PROB Probability
PROC Procedure
PROV Provisional
PS Plus
PSN Position
PSP Pierced steel plank
PTN Procedure turn
PWR Power
Q
QDM Magnetic heading (zero wind)
QDR Magnetic bearing
QFE Atmospheric pressure at aerodrome elevation (or at runway threshold)
QFU Magnetic orientation of runway
QNH Atmospheric pressure reduced to MSL by ICAO Standard Atmosphere and altimeter sub-scale setting to obtain aerodrome elevation when on the ground
QTE True bearing from the station
R
R Red
R… Restricted area (followed by identification)
R… Radial (followed by Mag track
R Right (runway identification)
RA Rain
RAF Royal Air Force
RAG Runway arresting gear
RASN Moderate rain and snow
RCA Reach cruising altitude
RCAF Royal Canadian Air Force
RCC Rescue coordination centre
RCF Radio communication failure message
RCL Runway centre line
RDH Reference datum height (for ILS )
RDL Radial
RDO Radio
RE Recent (used to qualify weather phenomena such as rain, e.g. recent rain = RERA)
REC Receive or receiver
REF Reference to… or to …
REG Registration
REP Reporting point
REQ Request or requested
RFL Requested flight level
RFP Replacement Flight Plan
RG Range (lights)
RIF Reclearance öin flight
RMK Remark
RNAV Area Navigation
RNG Radio Range
ROFOR Route forecast (in aeronautical meteorological code)
RON Receiving only
RPL Repetitive flight plan
RPS Radar position symbol
RPT Repeat or I repeat
RQS Request supplementary flight plan message
RSC Rescue sub-centre
RSP Responder beacon
RSR En-route surveillance radar
RT Right turn
RTD Delayed (used to indicate delayed meteorological messages)
RTF Radiotelephone
RTG Radiotelegraph
RTT Radioteletypewriter
RUT Standard regional route transmitter frequencies
RV Rescue vessel
RVR Runway visual range
RWY Runway
S
S South or southern latitude
SA Duststorm, sandstorm, rising dust or rising sand
SAP As soon as possible
SAR Search and Rescue
SARPS Standards and Recommended Practices (ICAO)
Sat Saturday
SB Self-Briefing
SC Straticumulus
SCT Scattered
SE Southeast
SEC Seconds
SELCAL Selective Calling System ( A system which permits the selective calling of individual aircraft over radiotelephony channels linking a ground station with the aircraft)
SEP September
SEV Severe (used e.g. to qualify icing and turbulence reports)
SFC Surface
SG Snow grains
SH Showers
SHF Super high frequency (3000 –30000 MHz)
SHRA Moderate rain shower
SHRASN Moderate shower with rain and snow
SHSN Moderate snow shower
SID Standard instrument departure
SIF Selective identification feature
SIGMET Information concerning en-route weather phenomena which may affect the safety of aircraft operations
SIGWX Significant weather
SIMUL Simultaneous or simultaneously
SIWL Single isolated wheel load
SKC Sky clear
SKED Schedule or scheduled
SLAP Slot Allocation Procedure
SMC Surface movement control
SMR Surface movement radar
SN