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P F S P roduct Fi le Se ts
P G A Pin Grid Array
P H A R E P rogram for Ha rm on ized ATC Resea rch in Euro pe
P H I B U F Perform a nce Buffet Limit
P H I N O M Nominal Ba nk Ang le
P H Y P hys ical In terface Device
Phase A s ignal in wh ich the phase va ries (wi th res pect to th e
M o d u l a t i o n original signal) wi th the amplitude of the modula tory
s ign a l , wh i le the amplitude of the carrier wave
remains con sta n t . S i m i lar to a modi fied freque nc y
m odula ted sign a l .
P I Pa ra me ter Id e n t i fier
P I A Perform a nce In tegri ty and Ava i la bi l i ty
P I C S P ro toc ol Im ple me n ta t ion Conform a nce Sta te me n ts
P D B Perform a nce Da ta Ba se
P D C P re - De pa rt u re Clea ra nce
P D C U Panel Da ta Conce n tra tor Un i t
P D D Pack age Des ign Docume n t
P D D I P roduct Defi n i t ion Da ta In terface. S ta n d a rdizes digi ta l
d esc ri p t ions of pa rt configu ra t ions and pro pert ies
n eed ed for manu fact u ri ng.
P D F P ri m a ry Display Funct ion
P D L P rogram Des ign Langu age
P- D M E P rec i s ion Dista nce Mea s u ri ng Equi pme n t
P D N P u bl ic Da ta Ne twork (CC ITT / ISD )
P D O P Pos i t ion Dilution Of Prec i s ion . A G PS term for error
i n troduced into the GPS calcula t ion s.
P D O S Powered Door Ope n i ng Syste m
P D R P re l i m i n a ry Des ign Review
P D S P ri m a ry Display Syste m
P D U ( 1 ) Power Distri b u t ion Un i t
( 2 ) Power Drive Un i t
( 3 ) P ro toc ol Da ta Un i t . The N-PDU is a com bi n a t ion
of the N-PCI and the N-UD or N-SDU. The
N - PDU is the to tal inform a t ion that is tra n sferred
be tween peer network me m bers (OSIModel)
as a un i t .
P E C T Peer En t i ty Con tact Ta ble
P E P Peak Enve lo pe Power
P E R F Perform a nce
Performance A re la t ive num ber used to com pa re the perform a nce
I n d ex of di fferent radar syste m s. It is calcula ted from
tra n s m i t ter peak power, a n tenna ga i n , p ul se width , prf,
a n tenna beam width and the rece iver noi se figu re.
P E R T P rogram Eva l u a t ion Review Tech i n que
P E S Pa sse nger En terta i nment Syste m
7 4
7 7
P N F P i lot Not Flyi ng
P N R Point of No Re t u rn
P OA Plain Old ACA RS
P O C P roof Of Conce p t
Polled Mode An ACA RS mode of opera t ion in wh ich the airborn e
system tra n s m i ts only in res pon se to rece ived upl i nk
messages (pol l s ).
P O P Point of Prese nce
P O R Pac i fic Ocean Region
P O S Pos i t ion
POS INIT Pos i t ion In i t ia l iz a t ion
POS REF Pos i t ion Refere nce
P OT Po te n t iome ter
P OT S Plain Old Te le p h one Syste m / Service
P P D U P hys ical Layer Pro toc ol Da ta Un i t
P P I Pla n n ed Pos i t ion In dic a tor. A type of radar di s play
wh ich shows airc raft pos i t ions and airways ch a rt on
the sa me di s play.
P P L P rocessor- to - P rocessor Link
p p m pages per minu te
P P M ( 1 ) P ul se Pos i t ion Modula t ion
( 2 ) Pa rts Per Million
P P O S P resent Pos i t ion
P P P Poi n t - to - Point Pro toc ol
P P S ( 1 ) Packe ts Per Sec on d
( 2 ) P rec i se Pos i t ion i ng Service
( 3 ) P ul se Per Sec on d
P R A I M P redict ive Rece iver Au ton om o us In tegri ty Mon i tori ng
P R A M P rerec ord ed An n o unce ment Mach i n e
P R E L I M P re l i m i n a ry Da ta
P I D ( 1 ) Pa ra me ter Id e n t i fier
( 2 ) P ri m i t ive Id e n t i fier
( 3 ) P rocess Id e n t i fier
P I / O P rocessor Inp u t / O u tp u t
P I R E P roduct ion or Pipe In ternal Roll Extrus ion
P I R E P S P i lot Re ports
Pitot Pressure The sum of the sta t ic and dyn a m ic press u res and is
the to tal force per unit area exerted by the air on th e
s u rface of a body in motion .
Pitot Tu b e A forwa rd fac i ng pro be attach ed to the outs ide of th e
a i rc raft to se n se the re la t ive press u re of the airc raft
m ovi ng th ro ugh the atm os p h ere. Na med for He n ri
P i tot who fi r st used this me th od of mea s u ri ng fl uid
flow press u re.
P L Pa ra me ter Le ng th
PLA ( 1 ) Power Level Ang le
( 2 ) P rogra m m a ble Logic Array
P L G R P rec i s ion Lig h twe ight GPS Rece iver
P L L P h a se Locked Loo p
P M P h a se Modula t ion
P M A ( 1 ) Pa rts Ma nu fact u ri ng A p prova l
( 2 ) Permanent Magnet A l tern a tor
P M AT Porta ble Ma i n te n a nce Access Term i n a l
P M C P rovi s ional Me m ory Cover
P M G Permanent Magnet Ge n era tor
P M O S P - Type Me tal Oxide Se m ic on ductor
P M S Perform a nce Ma n age ment Syste m
　
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