PETAL II  Preliminary.Eurocontrol.Test.of.Air/Ground.Data. Link,.Phase.II
PETAL IIe  Preliminary.Eurocontrol.Test.of.Air/Ground.Data. Link,.Phase.II.Extension
PF  (.1.).Pilot.Flying.. (.2.).Power.Factor
PFC  Primary.Flight.Computer
PFCS  Primary.Flight.Control.System
PFD  (.1.).Primary.Flight.Director.. (.2.).Primary.Flight.Display..An.EFIS.presentation. substituting.for.the.ADI.
PFIS Passenger.Flight.Information.System PFOV Primary Field Of View PFR Pulse Repetition Frequency. The rate at which
pulses.are.transmitted.
PFS  Product.File.Sets
PGA  Pin.Grid.Array
PHARE  Program.for.Harmonized.ATC.Research.in.
Europe
PHIBUF  Performance.Buffet.Limit
PHINOM  Nominal.Bank.Angle
PHY  Physical.Interface.Device
Phase  A.signal.in.which.the.phase.varies.(with.respect.
Modulation  to.the.original.signal).with.the.amplitude.of.the. modulatory.signal,.while.the.amplitude.of.the. carrier.wave.remains.constant..Similar.to.a. modified frequency modulated signal.
PI  Parameter Identifier
PIA  Performance.Integrity.and.Availability
PICS  Protocol.Implementation.Conformance.
Statements PID ( 1 ) Parameter Identifier .
( 2 ) Primitive Identifier .
( 3 ) Process Identifier PI/O Processor Input/Output

PIRE  Production.or.Pipe.Internal.Roll.Extrusion 
PIREPS  Pilot.Reports 
Pitot Pressure  The.sum.of.the.static.and.dynamic.pressures.and. 
is.the.total.force.per.unit.area.exerted.by.the.air. 
on.the.surface.of.a.body.in.motion. 
Pitot Tube  A.forward.facing.probe.attached.to.the.outside.of. 
the.aircraft.to.sense.the.relative.pressure.of.the. 
aircraft.moving.through.the.atmosphere..Named. 
for Henri Pitot who first used this method of 
measuring fluid flow pressure. 
PL  Parameter.Length 
PLA  (.1.).Power.Level.Angle.. 
(.2.).Programmable.Logic.Array 
PLGR  Precision.Lightweight.GPS.Receiver 
PLL  Phase.Locked.Loop 
PLT  Project.Leadership.Team 
PM  Phase.Modulation 
PMA  (.1.).Parts.Manufacturing.Approval.. 
(.2.).Permanent.Magnet.Alternator 
PMAT  Portable.Maintenance.Access.Terminal 
PMC  (.1.).Provisional.Memory.Cover.. 
(.2.).PCI.Mezzanine.Card 
PME  Processor/Mass Storage Equipment 
PMG  Permanent.Magnet.Generator 
PMO  Program Management Office