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L D U Lamp Driver Un i t
L E L i nk Esta bl i s h
L E D L ight Emitting Diod e
L e g The sect ion of the fl ight be tween two waypoi n ts.
L E O Low Earth Orbi t i ng
J A R-AW O Joint Ai rworth i n ess Requi re me n ts – All Wea th er
O pera t ion s
J ATO Jet Ass i sted Takeoff
J C D P Joint Conceptual Defi n i t ion Phase
J D P Joint Defi n i t ion Phase
J F E T J unct ion Fie ld Effect Tra n s i stor
J P S Jo u rnal Process i ng Syste m
J / S Ja m mer to Signal Ratio
J S AT Joint System Acce p ta nce Test
J TAG Joint Test Act ion Gro u p
J T I D S Joint Tact ical Inform a t ion Distri b u t ion Syste m
K B Ki lo - Bytes (th o usand bytes )
K B I T S Ki lo bi ts
K b p s Ki lo bi ts per sec on d
k b / s Ki lo bi ts Per Sec on d
K B U Key boa rd Un i t
K e y A h a nd-o pera ted swi tch i ng device or the act of
o pera t i ng such a device.
K G Ki logra m
k H z Ki lo h ertz (1000 cyc les per sec on d )
k m Ki lome ter
K P S Ki lo bytes Per Sec on d
k t s Kn o ts
k VA Ki lovol t - a m pere
k W Ki lowa t t
L Left
L 1 L - Band carrier (1575.42 MHz)
L2 L - Band carrier (1227.6 MHz)
5 4
5 7
L o c k-O n The con di t ion that exi sts when the DME rece ives
re ply pul ses to at lea st 50 percent of th e
i n terroga t ion s. Va l id di sta nce inform a t ion is th e n
ava i la ble.
LO M Loc a tor Outer Ma r ker. An NDB that is co-loc a ted at
the sa me site as the 75 MHz outer marker beac on .
LO N Longi t u d e
LO P Line Of Pos i t ion
LO R A N Long Range Naviga t ion .A system us i ng a gro un d
fac i l i ty com posed of a master sta t ion and a slave
sta t ion .The airborne rece iver com p u tes the pos i t ion
of the airc raft by us i ng two or more rece ived
m a ster- s lave pairs of sign a l s. LORA N - A o pera tes at
1850,1900 and 1950 kHz. LORAN-C opera tes at
100 kHz. LORA N-A was re placed by LORAN-C in
1980.
LORAN C Long Range Naviga t ion Syste m
LO S ( 1 ) Line Of Sig h t
( 2 ) L i n e - O rie n ted Simula t ion
L P L i n ear Pola riz a t ion
LP C Low Press u re Com pressor
L P D U L i nk Pro toc ol Da ta Un i t
LP T Low Press u re Tu r bine
LRA or LRRA ( 1 ) Low - R a nge Radio A l t i me ter
( 2 ) Line Re placea ble Asse m bly
L R C Long Range Crui se
L R M Line Re placea ble Module
L R N Long Range Naviga t ion
L R R Long Range Radar
L R U Line Re placea ble Un i t
L S B ( 1 ) Lower Sid e ba n d.The lower sid e band is th e
di ffere nce in freque ncy be tween the AM carrier
s ignal and the modula t ion sign a l .
( 2 ) Lea st Sign i ficant Bi t
L F Low Freque nc y. The freque ncy ra nge from 30 to
300 kHz.
L F R Low Freque ncy Radio Range
L G A Low Gain An te n n a
L H P L ig h tn i ng HIRF P ro tect ion
LI B Left Inboa rd
L I M L i m i t
L I M N AT R A N L i m i ted North Atla n t ic Regional Air Naviga t ion
L I N C S Long - Haul In terfac i l i ty Com mun ic a t ions Syste m
LI S N Line Im ped a nce Sta bi l iz a t ion Ne twork
L L C Logical Link Con trol
L L M S L iquid Level Mea s u re ment Syste m
L L P Left Lower Pl ug. Id e n t i fies the pl ug on the rea r
c on n ector of an avion ics un i t .
L/ M L i st of Ma teria l s
L M E L i nk Ma n age ment En t i ty
L M I Logical Ma n age ment In terface
L M M Loc a tor Mid dle Ma r ker.An NDB that is co-loc a ted at
the sa me site as the 75 MHz mid dle marker beac on .
L M P Left Mid dle Pl ug. Id e n t i fies the pl ug on the rea r
c on n ector of an avion ics un i t .
L M T Local Mean Ti me
L N A Low Noi se Am pl i fier
LN AV L a teral Naviga t ion
LO Low
LO B Left Outboa rd
LO C Loc a l izer. The la teral guid a nce port ion of an
ILS syste m .
5 6
5 9
M a g n e t i c The di rect ion north as determ i n ed by the ea rth’s
N o r t h m agn e t ic fie ld.The refere nce di rect ion for
mea s u re ment of magn e t ic di rect ion s.
M A I N T Ma i n te n a nce
M A L D T Mean Adm i n i stra t ive and Logi st ics De lay Ti me
M A P ( 1 ) M i ssed A p proach Poi n t
( 2 ) Mode An nunc ia tor Pa n e l
M a r ke r A tra n s m i t ter opera t i ng at 75 MHz that provid es
B e a c o n id e n t i fic a t ion of a pa rt icular pos i t ion along an airway
or on the approach to an instrument runway. T h e
m a r ker beac on is con t i nu o us ly ton e - m odula ted by a
400 - H z , a 1,300-Hz or a 3,000-Hz ton e.Ma r ker
beac ons along an instrument runway provide
a long - c o u r se (ra nge) guid a nce and des ign a te when an
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