OBS (1) Omnibearing Selector. A panel instrument which contains the controls and circuits to select an omnibearing and determine the TO-FROM indication. (2) Optical Bypass Switch
Octal Base-8 counting system. Numbers include 0,1,2,3,4, 5,6,7,8.
ODAP Oceanic Display And Planning system. Will present oceanic flight data to controllers in a display that will enable better route and altitude assignments.
ODID Operational Display and Input Development
ODL (1) Optical Data Link (2) Oceanic Display and Planning System
OEM Original Equipment Manufacturer
OEU Overhead Electronics Units
Off-Block Time The time that the aircraft leaves the gate. OFP Operational Flight Program
OID Outline Installation Drawing
OIU Orientation/Introduction Unit
OLAN Onboard Local Area Network
OM Outer Marker
OMEGA A navigation system that uses two high-powered transmitter ground stations to broadcast a continuous wave signal. The receiver measures the range differ-ence between the two stations to determine position.
Omnibearing The bearing indicated by a navigational receiver on transmissions from an omnidirectional radio range (VOR).
OMS (1) Onboard Maintenance System (2) Order Management System
OOOI OUT-OFF-ON-IN. An OOOI event is recorded as part of the ACARS operation. The OUT event is recorded when the aircraft is clear of the gate and ready to taxi. The OFF event occurs when the aircraft has lift-
ed off the runway. The ON event occurs when the aircraft has landed. The IN event occurs when the air-
craft has taxied to the ramp area.
On-Block Time The time that the aircraft arrives at the gate.
OPAS Overhead Panel ARINC 629 System
OPBC Overhead Panel Bus Controller
OPR Once Per Revolution
OPS Operations Per Second
OPU Overspeed Protection Unit
OR Operational Requirements
OSC Order Status Report
OSI (1) Open Systems Interconnection
(2) Open System Interface
OTH Over The Horizon
OTS Organized Track System
OVRD Override
oxy Oxygen
P
PA (1) Passenger Address
(2) Power Amplifier
PAC Path Attenuation Compensation
PA/CI Passenger Address/Cabin Interphone
PACIS Passenger Address and Communication Interphone
System
Paired DME channels are paired with a VORTAC or ILS fre
Channels quency and are automatically selected when the VOR
TAC or ILS frequency is selected.Most navigation con
trols have this feature.
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