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

ORDER
JO 7340.2D
Effective Date:
April 3, 2014
 
     

Subject:  Contractions
       Includes: Change 1 effective 8/22/13, Change 2 effective 12/12/13, and Change 3 effective
       4/3/14
 
 

[Back to Section 1. Decode]

O

Contraction

Definition

Usage

O/F

on file

GEN

O/R

on request

GEN

O/T

overtime

GEN

OA

overhead approach

ATC

OAC

oceanic area control

GEN

OAG

Official Airline Guide

GEN

OANDR

operation and regulation

GEN

OAOI

on and off instruments

ATC

OARTS

oceanic air route tracking system

GEN

OAS

obstacle assessment surface

ICAO

OAT

outside air temperature

GEN

OB

on board

GEN

OBL

obliterate

GEN

OBND

outbound

ATC

OBS

observation

NWS

OBSC

obscure, obscured, or obscuring

ICAO

OBST

obstacle

ICAO

OBST

obstruct

GEN

OBSTN

obstruction

GEN

OC

obstruction chart

GEN

OC

on course

ATC

OCA

obstacle clearance altitude

ICAO

OCA

oceanic control area

ICAO

OCAC

oceanic ATC

GEN

OCAS

out of controlled airspace

ATC

OCFNT

occluded front

NWS

OCH

obstacle clearance height

ICAO

OCL

obstacle clearance limit

ICAO

OCLD

occlude

NWS

OCLN

occlusion

NWS

OCNL

occasional

GEN

OCR

occur

GEN

OCS

obstacle clearance surface

ICAO

OCTLA

out of control area

ATC

ODALS

omnidirectional approach lighting system

GEN

ODAPS

Oceanic Display and Planning System

ATC

OFAS

overseas flight assistance service

GEN

OFC

office

GEN

OFFL

official

GEN

OFM

out for maintenance

GEN

OFP

occluded frontal passage

NWS

OFP

original flight plan

GEN

OFSHR

offshore

NWS

OFW

off watch

GEN

OFXT

outer fix time

ATC

OFZ

Obstacle free zone

ICAO

OG

on ground

ATC

OGN

Originate

ICAO

OHD

overhead

ICAO

OI

on instruments

ATC

OINT

omni intersection

GEN

OIS

operational information system

ATC

OJT

on­the­job training

GEN

OK

operating normally

GEN

OK

We agree or it is correct

ICAO

OLDI

On line data interchange

ICAO

OLS

optical landing system

ATC

OM

outer marker

ICAO  

OMSG

our message

GEN

OMTNS

over mountains

NWS

ONER

oceanic navigational error report

ATC

ONSHR

on shore

NWS

ONT

Ontario

NWS

ONW

on watch

GEN

OOT

out of tolerance

GEN

OPA

opaque, white type of ice formation

ICAO

OPC

operational control

ICAO

OPDT

opposite direction traffic

GEN

OPER

operate

GEN

OPMET

operational meteorological (information)

ICAO

OPN

open

ICAO

OPN

operation

GEN

OPNML

operations normal

GEN

OPR

operate, operator, operational

ICAO

OPS

operations

ICAO

OPSNET

operations network

ATC

ORD

order, indication of

ICAO

ORGPHC

orographic

NWS

ORIG

original

GEN

ORL

overrun lights

GEN

ORS

over range station

ATC

OSV

ocean station vessel

NWS

OT

on time

ATC

OTAS

on top and smooth

NWS

OTFC

overflight traffic

GEN

OTLK

outlook

NWS

OTP

on top

ATC

OTR

other

GEN

OTRW

otherwise

GEN

OTS

organized track system

GEN

OTS

out of service

GEN

OUBD

outbound

ICAO

OV

location (PIREP only)

ATC

OVC

overcast

NWS

OVD

overdue

GEN

OVHD

overhead

GEN

OVLA

overlay

GEN

OVNGT

overnight

GEN

OVR

over

GEN

OVRN

overrun

GEN

OVSEA

overseas

GEN

OVTK

overtake

GEN

OW

one way

GEN

OWF

optimum working frequency

GEN

OXY

oxygen

GEN

 

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