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M F D S Mul t i funct ion Display Syste m
M F D U Mul t i funct ion Display Un i t
M F I T Mean Fault Isola t ion Ti me
6 0
6 3
M P E L Ma xi mum Perm i ss i ble Expos u re Leve l
M P U Mul t i funct ion Process Un i t
M R A M i n i mum Rece p t ion A l t i t u d e
MRDU Mul t ichannel Rece iver / Dec od er Un i t
M R O S E Mul t i ple - ta s ki ng Rea l - t i me Opera t i ng Syste m
E xecu t ive
M R R Ma nu fact u ri ng Revi s ion Request
M R T Mean Res pon se Ti me
M S M i l l i sec on d
m / s Me ter per Sec on d
M S A S M i n i stry of Tra n s porta t ion Sa te l l i te
Augme n ta t ion Syste m
M S B Most Sign i ficant Bi t
M S C Message Seque nce Chart
M S C P Mo bi le Sa te l l i te Service Provid er
M S D ( 1 ) Ma ss Storage Device
( 2 ) Most Sign i ficant Digi t
M S G Message
M S I Medi um Sc a le In tegra t ion
M S K M i n i mum Shift Keyi ng
M S L Mean Sea Leve l
M -S N D C F Mo bi le - Subnetwork De pendent Converge nce
M S P Mode S Spec i fic Pro toc ol
M S S R Mon o p ul se Sec on d a ry Surve i l la nce Radar
M S S S Mode S Spec i fic Services
M S U Mode Se lect Un i t
M T M i n i mum Ti me
M M R Mul t i - Mode Rece iver
M M S Ma i n te n a nce Ma n age ment Syste m
M N Magn e t ic North
M N C I D Ne twork Ma n age ment Category In teract ion Diagra m
M N P S M i n i mum Naviga t ion Perform a nce Spec i fic a t ion
M O Magn e to - O p t ic a l
M OA ( 1 ) Me m ora n dum of Agree me n t
( 2 ) M i l i ta ry Opera t ion Area
M O C A M i n i mum Obstruct ion Clea ra nce A l t i t u d e
M O D ( 1 ) Magn e to - O p t ical Drive
( 2 ) Modi fic a t ion
( 3 ) Modula tor
Mode A The pul se format for an id e n t i fic a t ion cod e
i n terroga t ion of an ATC RBS tra n s pon d er.
Mode B An optional mode for tra n s pon d er interroga t ion .
Mode C The pul se format for an altitude inform a t ion
i n terroga t ion of an ATC RBS tra n s pon d er.
Mode D An un a ss ign ed, o p t ional tra n s pon d er mod e.
Mode S ( 1 ) Mode Se lect (a tra n s pon d er format to allow
di sc re te interroga t ion and data link capa bi l i ty )
( 2 ) Se lect ive interroga t ion mode of SSR
M O D E M Modula tor / De m odula tor
M O P R M i n i mum Opera t ional Perform a nce Requi re me n ts
M O P S M i n i mum Opera t ional Perform a nce Sta n d a rds
M O R A M i n i mum Off - Ro u te A l t i t u d e
M O S Me tal Oxide Se m ic on ductor
M O S F E T Me tal Oxide Se m ic on ductor Fie ld Effect Tra n s m i t ter
M O U Me m ora n dum Of Un d er sta n di ng
M P ( 1 ) Main Processor
( 2 ) M id dle Pl ug. Id e n t i fies the pl ug pos i t ion on th e
rear con n ector of an avion ics un i t .
M P C U Mul t i port Pro toc ol Converter Un i t
6 2
6 5
M T T M A Mean Ti me to Ma i n te n a nce A lert
M T T R Mean Ti me To Re pa i r. Aperform a nce figu re calcula ted
by dividi ng the sum of the act ive re pair ela psed times
acc rued in a period on a num ber of des ign a ted items by
the num ber of th ese items re pa i red in the sa me period.
M T T R S Mean Ti me To Restore Service
M T T U R Mean Ti me To Un sch eduled Re m ova l .A perform a nce
figu re calcula ted by dividi ng the sum m a t ion of times
to un sch eduled re m oval for a sa m ple of re m oved
i tems by the num ber of re m oved items in the sa m ple.
This is di fferent from MTBUR since no allowa nce is
given to items that have not been re m oved.
M U ACA RS Ma n age ment Un i t
M U LT Mul t i pl ier
M U S M i n i mum Use Spec i fic a t ion . A ge n eric desc ri p t ion by
pa ra me ter and ch a racteri st ics of the test equi pme n t
and reso u rces requi red for test i ng a unit or syste m .
M U X Mul t i plexer
M WA R A Ma j or World Air Ro u te Area
N North
N 1 Fan speed
N 2 In termedia te com pressor speed
N3 H igh speed com pressor
N / A Not A p pl ic a ble
N AC A Na t ional Advi sory Com m i t tee for Aeron au t ic s
N A D I N Na t ional Ai r s pace Da ta In terch a nge Ne twor k
N A K Nega t ive Ackn owledge me n t
N A S ( 1 ) Na t ional Ai rc raft Sta n d a rd
( 2 ) Na t ional Ai r s pace Syste m
N A S A Na t ional Aeron au t ics and Space Adm i n i stra t ion
N A S PA L S NAS Prec i s ion A p proach and Landi ng Syste m
N AT North Atla n t ic Tracks
M T B F Mean Ti me Be tween Fa i l u res.A perform a nce figu re
c a lcula ted by dividi ng the to tal unit flyi ng hours
( a i r borne) acc rued in a period of time by the num ber
of unit fa i l u res that occu rred du ri ng the sa me time.
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