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W h ere to tal unit hours are ava i la ble, this may be used
in lieu of to tal unit flyi ng hours.
M T B O Mean Ti me Be twee n O u tages
M T B R ( 1 ) Mean Ti me Be tween Re m ova l
( 2 ) Mean Ti me Be tween Re pa i r s.A perform a nce
figu re calcula ted by dividi ng the to tal unit flyi ng
hours acc rued in a period by the num ber of un i t
re m ovals (sch eduled pl us un sch eduled) th a t
occu rred du ri ng the sa me period.
M T B U R ( 1 ) Mean Ti me Be tween Un sch eduled Re m ova l
( 2 ) Mean Ti me Be tween Unit Re place me n ts.A
perform a nce figu re calcula ted by dividi ng th e
to tal unit flyi ng hours (airborne) acc rued in a
period by the num ber of un sch eduled un i t
re m ovals that occu rred du ri ng the sa me period.
M TC Ma i n te n a nce Terminal Cabi n e t
M T D Ma i n te n a nce Terminal Display
M T F Ma i n te n a nce Terminal Funct ion
M T I Movi ng Ta rget In dic a tor.This type of radar di s play
will show only movi ng ta rge ts.
M T M Module Test and Ma i n te n a nce
M T M I U Module Test and Ma i n te n a nce Bus In terface Un i t
M T S AT Mul t i funct ion Tra n s port Sa te l l i te System (Ja pa n )
M T T DA Mean Ti me To Dispa tch A lert
M T T F Mean Ti me To Fa i l u re.A perform a nce figu re
c a lcula ted by dividi ng the sum m a t ion of times to
fa i l u re for a sa m ple of fa i led items by the num ber of
fa i led items in the sa m ple.The sa me item fa i l i ng N
t i mes con st i t u tes N fa i led items in the sa m ple. This is
di fferent from mean time be tween fa i l u res since no
a l lowa nce is given to items that have not fa i led.
M T T M Mean Ti me To Ma i n te n a nce.The ari thme t ic mean of
the time intervals be tween mainte n a nce act ion s.
6 4
6 7
N E G Nega t ive
N E M A Na t ional Electrical Ma nu fact u rers Assoc ia t ion
N E S D I S Na t ional Envi ronme n tal Sa te l l i te, Da ta and
Inform a t ion Service
N E T Ne twork En t i ty Ti tle
N E XC O M Next Ge n era t ion Com mun ic a t ion s
N E X R A D Next Ge n era t ion Radar
N F F No Faul ts Fo un d
N G AT M New Ge n era t ion Air Traffic Ma n ager
N H H igh Press u re Gas Ge n era tor RPM
N H E No tes and He l ps Edi tor
N I C E NAT Im ple me n ta t ionMa n age ment Gro u p
C ost Effect ive n ess
N I M S NAS Infra struct u re Ma n age ment Syste m
N I P Ne twork In terface Processor
N I R Ne twork In terface Ro u ter
N I R V Ne twork interface Ro u ter V DL
N I S No t - In - Service
N I S T Na t ional In st i t u te of Sta n d a rds and Tech n ology
N - L a y e r N is set for any layer name (such as link, n e twor k, e tc.)
or for the initial (e. g. N - SDU means LSDU at the link
layer ). OSI model defi n i t ion .
N L Low - P ress u re Gas Ge n era tor RPM
N L M Ne twor k - Loa d a ble Module
N L P Ne twor k L ayer Pro toc ol
N L R Ne th erla n ds Na t ional Aeros pace Labora tory
NLT Not Less T h a n
NM or NMI Nau t ical Mile
N M Ne twor kMa n age me n t
N ATA Na t ional Air Tra n s port Assoc ia t ion , Inc.
N ATC A Na t ional Air Traffic Con trol lers Assoc ia t ion
N AT S North Atla n t ic Track Syste m
N AT / N A M / PACNorth Atla n t ic / North Americ a n / Pac i fic
N AV Naviga t ion
N AVA I D Naviga t ional Aid
N a v i g a t i o n Amedi um holdi ng the custom ized naviga t ion
D a t a c a r d d a ta ba se.
N AV S TA R The NAVSTAR glo bal pos i t ion i ng system (GPS) is a
system us i ng 24 sa te l l i tes, all re port i ng prec i se time
s ign a l s, a long wi th loc a t ion keys. Eight sa te l l i tes are in
each of th ree 63 - d egree inc l i n ed plane circular or bi ts
at 11,000 nmi in altitude.The system is used for
n aviga t ion and determ i n i ng exact pos i t ion .
Nautical Mile E quiva lent to 6,076.1 fee t , or approxi m a te ly 1.15
( n m i ) sta t u te miles.
N B A A Na t ional Bus i n ess Avia t ion Assoc ia t ion
N C N umerical Con trol
N I C New In sta l la t ion Conce p t
N C D No Com p u ted Da ta
N C I Not Curre n tly Im ple me n ted
N C S Ne twork Coordi n a t ion Sta t ion
N D Naviga t ion Display. An EFIS prese n ta t ion subst i t u t i ng
for the horizon tal situation indic a tor (HSI ).
N D B ( 1 ) Naviga t ion Da ta Ba se (as stored in FMC me m ory )
( 2 ) Non - D i rect ional Radio Beac on .Agro und sta t ion
d es ign ed spec i fic a l ly for A DF use that opera tes in
the 190 - to - 550-kHz ra nge.Tra n s m i ts a con t i nu o us
c a rrier wi th eith er 400 - or-1020 Hz modula t ion
( keyed) to provide id e n t i fic a t ion.
　
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