U.S. DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
Air Traffic Organization Policy

ORDER
JO 7340.2D
Effective Date:
May 2, 2013
 
     

Subject:  Contractions
       Includes: Change 1 effective 8/22/13 and Change 2 effective 12/12/13    
 

[Back to Section 2. Encode]

O

Definition

Contraction

Usage

Obliterate

OBL

GEN

Obscure, obscured, or obscuring

OBSC

ICAO

obscured sky condition

X

NWS

Observation

OBS

NWS

Obstacle

OBST

ICAO

obstacle assessment surface

OAS

ICAO

obstacle clearance altitude

OCA

ICAO

obstacle clearance height

OCH

ICAO

obstacle clearance limit

OCL

ICAO

obstacle clearance surface

OCS

ICAO

Obstacle free zone

OFZ

ICAO

Obstruct

OBST

GEN

Obstruction

OBSTN

GEN

obstruction chart

OC

GEN

Occasional

OCNL

GEN

Occlude

OCLD

NWS

occluded frontal passage

OFP

NWS

Occlusion

OCLN

NWS

occluded front

OCFNT

NWS

Occur

OCR

GEN

ocean station vessel

OSV

NWS

oceanic air route tracking system

OARTS

GEN

oceanic area control

OAC

GEN

oceanic ATC

OCAC

GEN

oceanic control area

OCA

ICAO

Oceanic Display and Planning System

ODAPS

ATC

oceanic navigational error report

ONER

ATC

off watch

OFW

GEN

Office

OFC

GEN

Official

OFFL

GEN

Official Airline Guide

OAG

GEN

Offshore

OFSHR

NWS

omni intersection

OINT

GEN

omnidirectional approach lighting system

ODALS

GEN

on and off instruments

OAOI

ATC

on board

OB

GEN

on course

OC

ATC

on file

O/F

GEN

on ground

OG

ATC

on instruments

OI

ATC

On line data interchange

OLDI

ICAO

on request

O/R

GEN

on shore

ONSHR

NWS

on time

OT

ATC

on top

OTP

ATC

on top and smooth

OTAS

NWS

on watch

ONW

GEN

one way

OW

GEN

Ontario

ONT

NWS

on­the­job training

OJT

GEN

opaque, white type of ice formation

OPA

ICAO

open

OPN

ICAO

operate

OPER

GEN

operate, operator, operational

OPR

ICAO

operating normally

OK

GEN

operation

OPN

GEN

operation and regulation

OANDR

GEN

operational control

OPC

ICAO

operational information system

OIS

ATC

operational meteorological (information)

OPMET

ICAO

operations

OPS

ICAO

operations network

OPSNET

ATC

operations normal

OPNML

GEN

opposite direction traffic

OPDT

GEN

optical landing system

OLS

ATC

optimum working frequency

OWF

GEN

order, indication of

ORD

ICAO

organized track system

OTS

GEN

original

ORIG

GEN

original flight plan

OFP

GEN

Originate

OGN

ICAO

orographic

ORGPHC

NWS

other

OTR

GEN

otherwise

OTRW

GEN

our message

OMSG

GEN

out for maintenance

OFM

GEN

out of control area

OCTLA

ATC

out of controlled airspace

OCAS

ATC

out of service

OTS

GEN

out of tolerance

OOT

GEN

outbound

OBND

ATC

outbound

OUBD

ICAO

outer fix time

OFXT

ATC

outer locator

LO

ICAO

outer marker

OM

ICAO

outlook

OTLK

NWS

outside air temperature

OAT

GEN

over

OVR

GEN

over mountains

OMTNS

NWS

over range station

ORS

ATC

overcast

OVC

NWS

overdue

OVD

GEN

overflight traffic

OTFC

GEN

overhead

OHD

ICAO

overhead

OVHD

GEN

overhead approach

OA

ATC

overlay

OVLA

GEN

overnight

OVNGT

GEN

overrun

OVRN

GEN

overrun lights

ORL

GEN

overseas

OVSEA

GEN

overseas flight assistance service

OFAS

GEN

overtake

OVTK

GEN

overtime

O/T

GEN

oxygen

OXY

GEN

 

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