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S L Se n s i t ivi ty Leve l
S / L S u b - Leve l
S L A Service Level Agree me n t
Slant Range The line-of - s ight di sta nce from the airc raft to a DME
gro und sta t ion .
S L C Synch ron o us Link Con trol
S L H System Level Hea l th
S L I System Level In terface
S L M S ta n d a rd Le ng th Message
S L o C So u rce Lines of Cod e
S L S S id e - Lo be Suppress ion .A system that preve n ts a
tra n s pon d er from re plyi ng to the sid e - lo be
i n terroga t ions of the SSR. Re plyi ng to sid e - lo be
i n terroga t ions wo uld supply fa l se re pl ies to the ATC
gro und sta t ion and obscu re the airc raft loc a t ion .
S L U C System Level Use Case
S LV ( 1 ) Service Level Veri fier
( 2 ) Sync Lock Va lve
S M A S u rface Move ment Advi sor
S M C System Ma n age ment and Com mun ic a t ion
S M D S u rface Mo unt Device
S M D S Swi tch ed Mul t i - mega bit Da ta Service
S M E System Ma n age ment En t i ty
S M G C S S u rface Move ment Guid a nce and Con trol Syste m s
S M I S ta n d a rd Message Id e n t i fier s
S M L S Sea m less Pipe and Tu be
S M S S pectrum Mon i tori ng Syste m
9 0
9 3
S q u i t t e r ( 1 ) The ra n d om pul se pairs ge n era ted by the gro un d
sta t ion as a fi l ler sign a l .
( 2 ) The tra n s m i ss ion of a spec i fied re ply format at a
m i n i mum ra te wi thout the need to be
i n terroga ted. ( Fi l ler pul ses tra n s m i t ted be twee n
i n terroga t ions) [XPD ] .
( 3 ) S pon ta n eo us Tra n s m i ss ion ge n era ted once per
sec ond by tra n s pon d er s.
S R Service Request
S R A D D Softwa re Requi re me n ts And Des ign Desc ri p t ion
S R A M S ta t ic Random Access Me m ory
S R D Systems Requi re me n ts Docume n t
S R E J Se lect ive Re ject
S R M Se lect ive Re ject Mod e
S R P Se lected Refere nce Poi n t
S R R Sa te l l i te Rec ogn i t ion Rece iver
S R T Sa te l l i te Rece iver Tra n s m i t ter
S R U Shop Re placea ble Un i t
S S B S i ng le Sid e ba n d. An AM signal that has a reduced
c a rrier, wi th the power appl ied to a sing le sid e ba n d.
S i nce the ba n dwidth of the inform a t ion - c a rryi ng
s ignal is reduced, a be t ter sign a l - to - n oi se ra t io is
o b ta i n ed at the rece iver.
S S C V / D R Sol id - S ta te Cock pit Voice / Da ta Rec ord er
S S C V R Sol id - S ta te Cock pit Voice Rec ord er
S S E C S ta t ic So u rce Error Correct ion
S S F D R Sol id - S ta te Fl ight Da ta Rec ord er
S S M S ign Sta t us Ma tri x
S S R Sec on d a ry Surve i l la nce Radar. A ra d a r- type
system that requi res a tra n s pon d er to transmit
a re ply sign a l .
S S S C S i ng le Sid e band Suppressed Carrier. A SSSC signal is
a band of au dio inte l l ige nce freque nc ies that have
been tra n s la ted to a band of ra dio freque nc ies wi th o u t
di stort ion of the inte l l ige nce sign a l .
S PAT E S pec ial Purpose Au tom a t ic Test Equi pme n t
S P C S ta t i st ical Process Con trol
S P D S peed
S P E Se l ler Purch a sed Equi pme n t
Speed of Re prese n ted by the sym bol c and has a va l ue of
L i g h t 2.9979250 x 108 me ter s / sec ond or
983,571,194 fee t / sec on d.
S P I S pec ial Pos i t ion Id e n t i fic a t ion
S P I P Des ign a t ion for a tra n s pon d er ident pul se.
S P K R S peaker
S P M ( 1 ) S ta bi l izer Pos i t ion Modules
( 2 ) S u rface Pos i t ion Mon i tor
S p o k i n g Refers to a di s play prese n ta t ion that ra dia tes outwa rd
from the di s play origin like the spo kes on a wagon
wh ee l .
S P R Sync Phase Rever sa l . ( Term is used in Mode S
tra n s pon d er s.)
S P S ( 1 ) Se n sor Process i ng Subsyste m
( 2 ) S ta n d a rd Pos i t ion i ng Service
SQ or Sql Sque lch
S Q Service Quality
S Q B Service Quality / Bi l l i ng Processor
S Q D Service Quality Da ta
S Q L S truct u red Query Langu age
S Q P S ignal Quality Pa ra me ter
Squall Line A squall line is a line of th un d er storms and
d eve lo pi ng th un d er storm s.
S q u a w k Re ply to interroga t ion signal (XPD ).
S q u e l c h A c on trol and/or circuit that reduces the gain in
res pon se of a rece iver.The sque lch is used to
e l i m i n a te the output noi se of the rece iver when a
s ignal is not be i ng rece ived.
9 2
9 5
S T D M A Synch ron ized Ti me Divi s ion Mul t i ple Access
S T E P C L B S tep Climb
S T I U Sa te l l i te Te lec om mun ic a t ions In termedia te Un i t
S T M Serial Tra n s i t ion Module
S TO L S h ort Takeoff and Landi ng
　
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