O

O
O	Open
O	Orange
O/C	Open Circuit
O/P	Output
O/W	Out Standing Work / Outstanding Work
O2	Oxygen (Symbol)
OAMS	Onboard Asynchronous Messaging Service
OANC	Onboard Airport Navigation Computer
OANS	Onboard Airport Navigation System
OAT	Outside Air Temperature
OBCE	On-Board Control Equipment
OBCE-WW	On-Board Control Equipment - WorldWide
OBCEww	On-Board Control Equipment worldwide
OBOGS	On Board Oxygen Generation System
OBRM	On Board Replaceable Module
OBS	Omni Bearing Selector
OBSV	Observation
OBSVR	Observer
OC	Oceanic Clearance
OC	On Condition
OC	Open Circuit
OC	Order Card
OC	Overcurrent
OCCPD	Occupied
OCCPNT	Occupant
OCED	Operator-Customized ECAM Database
OCL	Obstacle Clearance Limit
OCM	Outflow valve Control Module
OCS	Obstacle Clearance Surface
OCSM	Outflow valve Control and Sensor Module
OCU	Outflow Valve Control Unit
OD	Outside Diameter
ODD	On Dock Date
ODMS	Oil Debris Monitoring System
ODR	On-Demand Repository
ODR	Operator Differences Requirement
ODSM	Open world Data Storage Module
ODU	Optical Display Unit
OEA	Oxygen Enriched Air
OEB	Operating Engineering Bulletin
OEW	Operational Empty Weight
OF	Overfrequency
OFDM	Onboard Flight Data Monitoring
OFF/R	Off Reset
OFFR	Off/Reset
OFMV	Oil Flow Management Valve
OFP	Operational Flight Program
OFST	Offset
OFV	Outflow Valve
OFW	Outer False Work
OGV	Outlet Guide Vane
OH	Opposite Hand
OHDS	OverHeat Detection System
OHDU	Overheat Detection Unit
OHSC	Overhead Stowage Compartment
OHU	Optical Head Unit
OIS	Onboard Information System
OIT	Oil Inlet Temperature
OIT	Onboard Information Terminal
OIT	Operator Information Telex
OIT	Operator Information Transmission
OK	Correct
OLIVER	Output Level Intended for Very Excellent Reproduction
OLMS	Operational Loads Monitoring System
OLW	Operational Landing Weight
OM	ILS Outer Marker
OM	Outer Marker
OM	Overhaul Manual
OMM	Overhaul Manual Manufacturer
OMS	Onboard Maintenance System
OMT	Onboard Maintenance Terminal
OMTBF	Observed Mean Time between Failure
OMTS	On-Board Mobile Telephony System
OMV	Overhaul Manual Vendor
ONS	Omega Navigation System
OOOI	Out of the gate, Off the ground, On the ground, Into the gate
OOT	Oil Outlet Temperature
OP	Opalescent
OP	Operational
OPAL	Order Processing Automated Line
OPER	Operative/Operation/Operating
OPMS	Oleo Pressure Monitoring System
OPNG	Opening
OPP	Opposite
OPS	Operation
OPS	Operations
OPSOV	Over-Pressure Shut Off Valve
OPT	Optimum
OPT	Optional
OPTL	Optional
OPTS	Oleo Pressure and Temperature Sensor
OPU	Overspeed Protection Unit
OPU	Overvoltage Protection Unit
OPV	Overpressure Valve
OR IVCP	Operational Reliability Integration Value Creation Project
ORF	Orifice
Org Per	Organic Peroxide
ORM	Onboard Replaceable Module
ORT	Owner Requirement Table
ORVD	Overpressure Relief Valve with Dump Function
ORZ	Omni Range Zero
OS	Offerability Specification
OS	Operating System
OSC	Oscillator
OSCM	Oxygen System Control and Monitoring
OSCU	Oxygen System Control Unit
OSF	Open world Server Function
OSFC	Open world Server Function Cabinet
OSG	Overspeed Safety Governor
OSP	Open Software Platform
OSW	OPERATIONAL SOFTWARE
OSW	Out of Sequence Work
OTOW	Operational Take-Off Weight
OTSSU	Outboard Transmission Speed Sensor Unit
OU	Outlet Unit
OUT	Outlet
OUT	Output
OUTB	Outbound
OUTBD	Outboard
OUTFLW	Outflow
OUTR	Outer
OV	Over
OVBD	Overboard
OVF	Over Frequency
OVFL	Overflow
OVHD	Overhead
OVHT	Overheat
OVLD	Overload
OVPRESS	Overpressure
OVRD	Override
OVSP	Overspeed
OVSTEER	Oversteer
OVTEMP	Overtemperature
OVV	Overvoltage
OW	Outer Wing
OWD	Open World Diode
OWD	Overwing Door
OWE	Operating Weight Empty
OWS	Open World Shell
Oxy M	Oxidizing Material
OXY	Oxygen
OZ	Ounce