OAC Oceanic Area Control Center OAG Official Airline Guide OAS Oceanic Automation System OAT ( 1 ) Operational Acceptance Test .
( 2 ) Optional Auxiliary Terminal. The OAT may be
in.the.form.of.a.CRT/Keyboard.device.capable. of.interfacing.with.other.sources.of.data.on.the. aircraft.and.supplying.data.to.a.hard.copy.printer.. (Used.in.an.ACARS.system.)..
( 3 ) Outside Air Temperature. The uncorrected
reading.of.the.outside.temperature.gauge..
Different types of gauges require different correct
ion.factors.to.obtain.static.air.temperature.
OATS Orbit and Attitude Tracking OBP Operational Build Plan OBS ( 1 ) Omnibearing Selector. A panel instrument
that.contains.the.controls.and.circuits.to.select.
an omnibearing and determine the TO-FROM
indication...
( 2 ) Optical Bypass Switch OCA Oceanic Control Area OCC Operations Control Center OCD Oceanic Clearance Delivery OCIG Oceanic Communications Improvement Group OCL Oceanic CLearance OCM Options Configuration Module OCP Oceanic Clearance Processor Octal Base-8.counting.system..Numbers.include.0,.1,.2,.
3,.4,.5,.6,.7.
ODAPS  Oceanic Display And Planning System. Will present oceanic flight data to controllers in a display.that.will.enable.better.route.and.altitude. assignments.
ODAR  Organizational Designated Airworthiness
Representative
ODID  Operational Display and Input Development

ODL  ( 1 ) Optical Data Link . 
( 2 ) Oceanic Data Link 
ODN  Open Data Network 
OEM  Original Equipment Manufacturer 
OEU  Overhead Electronics Units 
Off-Block Time  The.time.that.the.aircraft.leaves.the.gate. 
Off-Side  Same.as.cross-side.of.the.cockpit. 
OFP  Operational Flight Program 
OFST  Offset 
OGE  Operational Ground Equipment 
OHU  Overhead Unit (HUD) 
OID  Outline Installation Drawing 
OIU  Orientation/Introduction Unit 
OLAN  Onboard Local Area Network 
OLDI  On-Line Data Interchange 
O&M  Operating and Maintenance 
OM  Outer Marker Beacon: MB used in conjunction 
with.ILS,.intercepts.glideslope.approximately.