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N D I Non d eve lo pme n tal Ite m
N E Ne twork Ele me n t
N E A N North Euro pean A DS-B Ne twor k
6 6
6 9
N S Ne twork Service
N S A P Ne twork Service Access Poi n t
N S D U Ne twork Service Da ta Un i t
N S E U Ne u tron Sing le Event Upse t
N S S L Na t ional Severe Storms Labora tory
N T F No Tro u ble Fo un d. ( Referri ng to test i ng or ch eckout of
un i t / m odule.)
N T I A Na t ional Te lec om mun ic a t ions and Inform a t ion
Adm i n i stra t ion (U. S.)
N T S B Na t ional Tra n s porta t ion Safe ty Boa rd
N U I Ne twork User Id e n t i fic a t ion
N V M Non -Vola t i le Me m ory
N V R A M Non -Vola t i le RA M
N W S Na t ional Wea th er Service.The NWS provid es a
gro un d - ba sed wea th er radar network th ro ughout th e
Un i ted Sta tes.The radar network opera tes
c on t i nu o us ly and tra n s m i ts the data to the Na t ion a l
Me teorological Center, wh ere it corre la tes wi th oth er
wea th er observa t ion s.
OAC Ocea n ic Area Con trol Center
OAG Offic ial Ai rline Guid e
OA S Ocea n ic Au tom a t ion Syste m
OAT ( 1 ) O pera t ional Acce p ta nce Test
( 2 ) O p t ional Auxi l ia ry Term i n a l . The OAT m ay be in
the form of a CRT / Key boa rd device capa ble of
i n terfac i ng wi th oth er so u rces of data on th e
a i rc raft and supplyi ng data to a hard copy pri n ter.
( Used in an ACA RS syste m .)
( 3 ) O u ts ide Air Te m pera t u re.The unc orrected
rea di ng of the outs ide te m pera t u re gauge.
D i fferent types of gauges requi re di fferent
c orrect ion factors to obtain sta t ic air te m pera t u re.
OAT S O r bit and Attitude Tracki ng
O B P O pera t ional Bui ld Pla n
N M C Na t ional Me teorological Center
N M C C D Ne twork Ma n age ment Category Cla ss Diagra m
N M C D Ne twork manage ment Category Diagra m
N M F Ne twork Ma n age ment Funct ion
N M I R S Ne twork Ma n age ment In terface Requi re me n ts
S pec i fic a t ion
N M O S N - type Me tal Oxide Se m ic on ductor
N M P Ne twork Ma n age ment Pla n
N M S Ne twor k Ma n age ment Syste m
N M T Not More T h a n
N OA A Na t ional Ocea n ic and Atm os p h eric Adm i n i stra t ion
N O C No t ice Of Change
N O C A R North Atla n t ic Ocea n ic Concept and Requi re me n ts
N O C C Na t ional Opera t ions Con trol Center
NO COM No Com mun ic a t ion . A NO COM annunc ia t ion
i n dic a tes that a downl i nk message has not bee n
ackn owledged in an ACA RS syste m .
N O I No t ice of In qui ry
N o i s e Un d es i red ra n d om electrom agn e t ic di st u r ba nces or
s p u rio us signals that are not pa rt of the tra n s m i t ted or
rece ived sign a l .
N O PAC North Pac i fic
N OTA M No t ice to Ai rme n
N OT U S No t ice to Users (ARINC )
N PA Non - P rec i s ion A p proach
N P D U Ne twork Pro toc ol Da ta Un i t
N R Ne twor k Ro u ter
N R D Ne twork Ro u t i ng Dom a i n
N R P Na t ional Ro u te Progra m
N R Z Non - Re t u rn to Zero
6 8
7 1
O M E G A A n aviga t ion system that uses two hig h - powered
tra n s m i t ter gro und sta t ions to broa d c a st a con t i nu o us
wave sign a l .The rece iver mea s u res the ra nge
di ffere nce be tween the two sta t ions to determ i n e
pos i t ion .
O m n i b e a r i n gThe bearing indicated by a navigational receiver on
transmissions from an omnidirectional radio range
(VOR).
O M S ( 1 ) O nboa rd Ma i n te n a nce Syste m
( 2 ) O rd er Ma n age ment Syste m
O M T Object Mod e l i ng Tech n ique
O OA Object Orie n ted An a lys i s
O O D Object Orie n ted Des ign
O O O I OUT - OFF- ON - IN.An OOOI event is rec ord ed as pa rt
of the ACA RS opera t ion .The OUT event is rec ord ed
when the airc raft is clear of the ga te and rea dy to ta xi .
The OFF event occurs when the airc raft has lifted off
the runway.The ON event occurs when the airc raft
has la n d ed.The IN event occurs when the airc raft has
ta xied to the ramp area .
O n - B l o c kT i m e The time that the airc raft arrives at the ga te.
O P O pera t ion a l
O P T O p t i mum
O PA S O verh ead Panel A R INC 629 Syste m
O P B C O verh ead Panel Bus Con trol ler
O P E R O pera t ion
O P R O nce Per Revol u t ion
O P S O pera t ions Per Sec on d
O P S P E C S O pera t ional Spec i fic a t ion s
O P U O ver s peed Pro tect ion Un i t
O-Q A R O p t ical Quick Access Rec ord er
O R O pera t ional Requi re me n ts
O S O pera t i ng Syste m
O B S ( 1 ) O m n i bea ri ng Se lector. A panel instrument that
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