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NWS ----------------- National Weather Service
OALT ---------------- Operational Acceptable Level of Traffic
OAT ------------------ Outside Air Temperature
OBS ------------------ Omni Bearing Selector
OC, O/C ------------- On Course
OCU ------------------ Operational Conversion Unit
ODAPS -------------- Oceanic Display and Planning System
OEI ------------------- One Engine Inoperative
OEM ----------------- Original Equipment Manufacturer
OF -------------------- Over Frequency
OFT ------------------ Outer Fix Time
OFZ ------------------ Obstacle Free Zone
OM ------------------- ILS Outer Marker
OMC ----------------- Onboard Maintenance Computer
ONC ------------------ Operational Navigation Charts
ONER ---------------- Oceanic Navigational Error Report
ONS ------------------ Omega Navigation System
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 654
OP AMP ------------- Operational Amplifier
OROCA ------------- Off-Route Obstruction Clearance Altitude
OSS ------------------- Over Station Sensor
OTR ------------------ Oceanic Transition Route
OTS ------------------ Organized Track System
OV -------------------- Overvoltage
OVAS ---------------- Ocular Vergence and Accommodation Sensor
PA -------------------- Passenger Address
PAFAM ------------- Performance and Failure Assessment Monitor
PAM ----------------- Pulse Amplitude Modulation
Pam ------------------ Ambient Pressure
PAMA --------------- Professional Aviation Maintenance Association
PAPI ----------------- Precision Approach Path Indicator
PAR ------------------ Precision Approach Radar
PAR ------------------ Preferential Arrival Route
PARA/SER --------- Parallel-to-Serial
PAS ------------------- Performance Advisory System
P ATT ---------------- Pitch Attitude
PATWAS ------------ Pilots Automatic Telephone Weather Answering Service
PB -------------------- Burner Pressure
PBB ------------------ Pitch Bar Bias
PBCT ---------------- Proposed Boundary Crossing Time
PBE ------------------ Protective Breathing Equipment
PC -------------------- Personal Computer
PCA ------------------ Positive Control Area
PCA ------------------ Power Control Actuator
PCB ------------------ Plenum Chamber Burning
PCB ------------------ Printed Circuit Board
PCCD ---------------- Profiled Charge-Coupled Device
PCL ------------------ Pilot Controlled Lighting
PCM ----------------- Pulse-Code Modulation
PCPL ---------------- Pitch Couple
PCU ------------------ Power Control Unit
PCWS ---------------- Pitch Control Wheel Steering
PDAR ---------------- Preferential Departure and Arrival Route
PDCS ---------------- Performance Data Computer System
PDO ------------------ Phosphorus-Doped Oxide
PDR ------------------ Preferential Departure Route
PDU ------------------ Pilot’s Display Unit
PECO ---------------- Pitch Erection Cutoff
PELS ----------------- Precision Emitter Location System
PFD ------------------ Primary Flight Display
P-FET ---------------- P-type conduction Field Effect Transistor
PGM ----------------- Precision Guided Munition
P Hold --------------- Pitch Hold
Phot-SCR ----------- Photosensitive Silicon Controlled Rectifier
PIBAL --------------- Pilot Balloon Observation
PIDP ----------------- Programmable Indicator Data Processor
PIO ------------------- Pilot Induced Oscillation
PIREP --------------- Pilot Report
PIU ------------------- Peripheral Interface Unit
PJFET --------------- P-type Junction-conduction Field Effect Transistor
PLA ------------------ Power Lever Angle
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 655
PLA ------------------ Programmable Logic Array
PLL ------------------ Phase-Locked Loop
PM -------------------- Phase Modulated
PMA ----------------- Parts Manufacturer Approval
PMAT --------------- Portable Maintenance Access Terminal
PMB ------------------ Plastic Media Blasting
PMOS ---------------- P-type Metal Oxide Silicon semiconductor
PMS ------------------ Performance Management System
PNCS ---------------- Performance Navigation Computer System
PND ------------------ Primary Navigation Display
POS ------------------ Positive
POT ------------------ Potentiometer
PPI ------------------- Plan Position Indicator
PPM ------------------ Parts Per Million
PPM ------------------ Pulse Position Module
PR -------------------- Pressure Ratio
PRAM --------------- Programmable Analog Module
PRF ------------------ Pulse Repetition Frequency
PRL ------------------ Parallel
　
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