AIRCRAFT ABBREVIATIONS

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O Open
O Orange
O/C Open Circuit
O/P Output
Org Per Organic Peroxide
Oxy M Oxidizing Material
OAT Outside Air Temperature
OBRM On Board Replaceable Module
OBS Omni Bearing Selector
OBSV Observation
OBSVR Observer
OC On Condition
OC Open Circuit
OC Order Card
OC Overcurrent
OCCPD Occupied
OCCPNT Occupant
OCL Obstacle Clearance Limit
OCS Obstacle Clearance Surface
OD Outside Diameter
OEB Operating Engineering Bulletin
OEW Operational Empty Weight
OF Overfrequency
OFFR Off/Reset
OFST Offset
OGV Outlet Guide Vane
OH Opposite Hand
OHSC Overhead Stowage Compartment
OHU Optical Head Unit
OIT Oil Inlet Temperature
OIT Operator Information Telex
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
OMTBF Observed Mean Time between Failure
OMV Overhaul Manual Vendor
ONS Omega Navigation System
OOT Oil Outlet Temperature
OP Opalescent
OP Operational
OPAL Order Processing Automated Line
OPER Operative/Operation/Operating
OPNG Opening
OPP Opposite
OPS Operation
OPS Operations
OPT Optimum
OPT Optional
OPTL Optional
OPU Overspeed Protection Unit
OPV Overpressure Valve
ORF Orifice
ORM Onboard Replaceable Module
ORT Owner Requirement Table
ORZ Omni Range Zero
OSC Oscillator
OSG Overspeed Safety Governor
OTOW Operational Take-Off Weight
OUT Outlet
OUT Output
OUTB Outbound
OUTBD Outboard
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
OVV Overvoltage
OW Outer Wing
OWE Operating Weight Empty
OXY Oxygen
OZ Ounce
O2 Oxygen (Symbol)
OAMS Onboard Asynchronous Messaging Service
OANC Onboard Airport Navigation Computer
OANS Onboard Airport Navigation System
OBCE On-Board Control Equipment
OBCEww On-Board Control Equipment worldwide
OBOGS On Board Oxygen Generation System
OCM Outflow valve Control Module
OCSM Outflow valve Control and Sensor Module
ODU Optical Display Unit
OFDM Onboard Flight Data Monitoring
OFF/R Off Reset
OFMV Oil Flow Management Valve
OFV Outflow Valve
OHDS OverHeat Detection System
OHDU Overheat Detection Unit
OIS Onboard Information System
OMT Onboard Maintenance Terminal
OMTS On-Board Mobile Telephony System
OPMS Oleo Pressure Monitoring System
OPTS Oleo Pressure and Temperature Sensor
ORVD Overpressure Relief Valve with Dump Function
OS Operating System
OSCU Oxygen System Control Unit
OU Outlet Unit
OUTFLW Outflow
OWD Open World Diode
OC Oceanic Clearance
OIT Onboard Information Terminal
OBCE-WW On-Board Control Equipment - WorldWide
OCU Outflow Valve Control Unit
ODMS Oil Debris Monitoring System
OEA Oxygen Enriched Air
OVTEMP Overtemperature
OWS Open World Shell
OIT Operator Information Transmission

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