Sym
bols Sym
bols.... ...................................................... 5 5
AA
t a gla nce t
a gla nce ...................................................... 6 6
Co ckpit ........ ................................................... 6
Indicat orand warning lamps(standar d)...... ... 10
Indicat orand warning lamps(Widescr een
Coc kpit) ............ ............................................12
Ov erhead controlpanel .................................14
Door operating unitandseat adjustment .......16
Emer gencie sand break downs .......... .......... ...18 DigitDigit
alOpe r al
Ope rat at
or's Manua l or's
Manua l.......... .................... 20 20
Cal ling uptheDigit alOper ator's Manual ........ 20 GenerGener
alno t al
no tes es
..... .......................................... 22 22
Pr otection oftheen vironment ....................... 22
Genuine Mercedes-Benz parts..... .................. 22
Oper ator's Manual .......... .............................. 23
Mer cedes meapp ................................... ......2 4
Ser viceand vehicle operation ............... ......... 24
Oper atingsaf ety................................ ............ 25
Decl arati on ofcon form ity forwir eless
ve hicle compone nts... ...... ............................. 27 Diag
nostics conn ection................................. 27
Quali /edspecial istwo rkshop ........................ 28
Cor rect use oftheve hicle ............................. 29
Spo rtUtil ityVehicle ....................................... 29
No tesfo rper sons withelectr onicmedical
aids ..............................................................29
Pr oblems withyo ur vehicle ............................3 0
Re por ting safetydef ect s................................ 30
Lim ited Warrant y... ........................................3 1
QR code forre scue card... ............................3 1
Dat astor ag e.... ........ .....................................3 1
Cop yright .................. .................................... 36 Occupant
safe Occupant
safety ty
...... ......................................37 37
Re str aint system ...........................................3 7
Sea tbe lts ............ .........................................3 9
Airba gs......... ......... .......................................43
PRE-S AFE®
sy stem ......... ...............................50
Au tomatic measur esaTer anaccident ......... .. 51
Saf elytranspor tingchildr enintheve hicle ...... 51
No teson pets intheve hicle .......................... 65 Open
ingand closin g Open
ingand closin g... ........................... ........ 66 66
Smar tKey <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F> 66Door
s<000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F> 70
Car gocom partment <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F> 74
Side windo ws<000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F> 79
Sliding sunroof<000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F> 82
An ti-th eT protection .......... ............................ 86 Seats
andsto Seats
andstowing wing
.........................................8 9 89
No teson thecor rect driver's seat positi on....8 9
No teson theheight limitontheth ird ro w
of seats .........................................................9 0
Sea ts.... ........................................................ 90
St eer ing wheel ............................................ 101
Easy entryand exitfeatur e... ....................... 102
Mem oryfu nct ion ......................................... 103
St owa geareas ...... ...................................... 104
Soc kets <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F> 119
Wi reless chargin gof themobile phone
and connection withth eex terior ant enna ....121
Inst alling/ remo vingth e0oor mats ............... 123 Light
andvisibility Light
andvisibility ........................................ 124 124
Ext erior lighting ........................................... 124
Int erior lighting ............................................ 129 22
Cont
ents
Wi
ndsh ieldwiperand wind shield washer
sy stem ................................................ ........ 130
Mir rors <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F> 134Clima
t Clima
te contr e
control ol
<000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F> 138 138
Ov ervie wof clim atecontrol systems ............ 138
Oper ating theclimat econtr olsystem .......... 138 DrDr
iving andpar iving
andparking king
..................................... 142 142
Dr iving ........................................................1 42
DY NAMI CSEL ECTsw itch... .........................1 54
Au tomatic transmission ...............................1 57
Fu nctio nof the4MA TIC...............................1 61
Re fuel ing.....................................................1 62
Pa rking ...... .................................................1 64
Dr iving anddriving safetysy stem s... ............ 171
Ve hicle towing instructi ons .................. ........ 222 InsIns
tr tr
umen tdispla umen
tdispla yand on-boar y
and on-boar dcom- d
com-
put put
er er
........................................................... 223 223
No teson theinst rument displa yand on-
boar dcom puter.......................................... 223
Ov ervie wof ins trument display... ................. 224 Ov
ervie wof butt ons onthesteer ing wheel ...225
Oper ating theon-boar dcom puter..... ...........2 25
Ov ervie wof displa ysintheinst rument
displa y... ..................................................... 227
Head-u pDispla y... ....................................... 227 MBUX
multimed iasyst MBUX
multimed iasystem em
............................2 30 230
Ov ervie wand oper ation ...............................230
Sy stem settings .......................................... 239
Na vigatio n.......... .........................................243
Te lephone ............ ....................................... 253
Mer cedes meapp ....................................... 257
Mer cedes-Benz emergency callsy stem ....... 264
Ra dio &media ........ .....................................2 67
Sound settings ............................................274 MaintMaint
enance andcar enance
andcare e
....... ..................... ..... 275 275
ASS YSTPL US service interva ldispla y...... .... 275
Engine compartment ................................... 276
Chec kingthebr ak epad thickness ................ 282
Cleaning andcare...... ................................. 282 BrBr
eakdo eakdo
wnassist wn
assist ance ance
.................................290 290
Emer gency .......... .......... .............................. 290
Fla ttir e.......... .............................................291
Batt ery(v ehi cle).......... ................................298
To w star tin gor towing away <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F> 302
Elec trica lfuses <000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F> 306 Whee
lsand tir Whee
lsand tires es
<000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F
000F000F000F000F000F000F000F000F000F> 310 310
No teson noiseorunu sual handl ingchar-
act eristics ................................................... 310
No teson regula rly in spect ing wheel sand
tir es ............................................................ 310
No teson sno wch ains ................................. 311
Ti re pressur e.... .... ....................................... 311
Loading theve hicle .....................................3 18
Ti re labeling ............ .................................... 322
De/n itionofterm sfo rtir es and loading .......327
Changing awheel ........................................ 329
Emer gency sparewheel ...............................3 38 TT
ec ec
hnical dat hnical
data a
....... ......................................342 342
No teson tech nica ldat a.......... .................... 342
Ve hicle electronics .......... ............................ 342
Re gula tory radio identi/ cation andnotes... .. 344 Con
tents
3 3
1
Steer ing wheel gearshiT paddle s →
159
2 Combi nation switc h →
125
3 Instrumen tdispl ay →
224
4 DIRECT SELECT leve r →
157
5 ü Start/ stop but ton →
143
00D6 ECOstar t/s topfun ction →
153
6 Media display →
230
7 Climat econtr olsystems →
138
8 002F Hazardwa rning light system →
126
9 PASSENGE RAIR BA Gind icat or lamp s →
47
A Glovebox →
107
B Storag ecom partment →
107
C Cup holder
D 0063 Controllerforvo lume andswitc hing
sound on/o. →
230
00D0 SwitchestheMBUX multimedia system
on/ o. →
230 E
z Callsupnavig ation →
232
F | Callsupradio ormedia →
232
G 002B Callsupthete lephone →
232
H ß Callsupfavo rite s →
232
I y Callsupvehicle funct ions →
232
J c ActivePa rking Assist →
218
K DYNAMI CSEL ECTsw itch →
155
L Touc hpad →
232
M Contr olpanel forth eMBUX multimedia system →
225
N Adjusts thesteer ing wheel →
101
O ý Switchesthesteer ing wheel heater
on/ o. →
102
P Contr olpanel:
On-boar dcom puter →
225
Cr uise contr ol →
181
H ActiveDist ance AssistDIS TRONI C →
184
Q Diagno sticsconnec tion →
27 At
aglan ce–Coc kpit
7 7
*
N N
O O
TE TE
Impai rment oftheoper ating e1-
ciency ofthere str aint system sfrom
inst alling acce ssorypar tsor from repair s
or we lding Airbags
andEmer gency Tensio ning Device s,
as wellas contr olunits andsensor sfo rth e
re str aint system s,ma ybe inst alle d in thefo l-
lo wing areas ofyour vehicle:
R Door s
R Door pillars
R Door sills
R Seats
R Coc kpit
R Instrumen tclus ter
R Cent erconsole
R Lateral roof frame #
Donotins tallacces sorypar tssuc has
audio systems inthese areas. #
Donotcar ryout repair sor we lding. #
Have accessor ypar tsretro/tt edata
qu ali/ed special istwo rkshop. Yo
ucould jeopar dizetheoper ating safetyof your
ve hicle ifyo uuse parts,tires and wheels aswell
as acces sories releva nt tosaf etywhic hha ve not
bee napp rove dby Mer cedes-Be nz.Safety-re leva nt
sy stems ,e.g. thebr ak esy stem, maymalfunction.
Onl yuse genuine Mercedes-Be nzpar tsor par tsof
eq ual qualit y.Onl yuse tires, wheels andacces-
sor ypar tsthat have been speci/call yappr oved
fo ryo ur vehicle model .
Genu ineMer cedes- Benzpar tsaresubj ectto
str ictqu alit yinsp ections. Eachpar thas been spe-
ciall yde veloped, manufacturedorselect edfor
Mer cedes-Be nzvehicles andadap tedto them.
Ther efor e, onl yge nuine Mercedes-Be nzpar ts
sh ould beuse d.
Mor eth an 300,0 00di.er entgenuine Mercedes-
Benz partsareav ailabl efo rMer cedes-Benz mod-
els.
All aut hor ized Mercedes-Benz Centersmaint aina
suppl yof genuine Mercedes-Be nzpar tsforneces-
sar yser vice andrepair work.In add ition, strategi-
cal lylocat edpar tsdeliv erycent erspr ov ide for
qu ick and reliable partsser vice. Alw
aysspecif yth eve hicle identi/cation number
(VIN) (/page345) when order ing genuine
Mer cedes-Be nzpar ts. Ope
r Ope
rat at
or's Manua l or's
Manua l
This Operator's Manual andtheDigit alOper ator's
Manual intheve hicle descr ibethefo llo wing mod-
els and thestandar dand special equipment for
yo ur vehicle:
R The model sand thestandar dand special
eq uipment availabl eat thetime ofthis Oper a-
to r's Manual goingtopress.
R The models andthestandar dand special
eq uipment onlyav ailabl ein cer tain countr ies.
R The models andthestandar dand special
eq uipment, whichwill onlybe availabl eat a
lat er dat e.
No tethat your vehicle mayno tbe equipp edwith
all featur esdescr ibed.This isalso thecase for
sy stems releva nt tosaf ety. Theref ore, theeq uip-
ment onyour vehicle maydi.er from that inthe
descr iptions andillustrations. Gener
alno tes
23 23
re
pair scar ried out ataqu ali/ed special -
is two rkshop. &
W W
AR NIN G AR
NIN GRisk ofacciden tor injurydue
to incor rect modi/cations onelect ronic
com pone ntpar ts
Mo di/cation ofelec tronic compone nts,their
soTw areor wir ing could impair their function
and/or thefunction ofother networke dcom-
ponent partsor saf ety-re leva nt systems .
This canenda nger theoper ating safetyof the
ve hicle. #
Neverta mp erwit hth ewir ing and elec-
tr onic component partsor their soT-
wa re. #
Youshould have all workon electr ical
and electr oniccomponent scar ried out
at aqu ali/ed special istwo rkshop. Obser
vethe"On-boar delectr onics" section in
"T ec hnical data". &
W W
ARNIN G ARNIN
GRisk of/redue to0amma ble
mat erial son hotpar tsof theex haus tsy s-
te m
Flammable material suc has lea ves, grass or
twig sma yign ite if th ey come intocont actwith
ho tpar tsof theex haus tsy stem. #
When drivi ng on unpa vedro ads oro.-
ro ad, regula rly ch eckth eve hicle under-
side. #
Remo vetrapp edplants orother 0amma-
ble mat erial, inpar ticu lar. #
Ifth er eis damag e,consult aqu ali/ed
special istwo rkshop immed iately. *
N N
O O
TE TE
Dam ageto theve hicle duetodriv-
ing toofast anddu eto impacts tothe
ve hicle underbod yor suspen sioncompo-
nen ts In
thefo llo wing situations, inpar ticular ,th er e
is arisk ofdamag eto theve hicle:
R The vehicle become sgr ounded, e.g.ona
high curb oran unpavedro ad
R The vehicle isdriven toofast ove ran
obst acle, e.g.acurb, speed bumpor pot-
hole
R Ahea vyobject strikes theunderbody or
suspension components
In situations suchas these, damag eto the
body ,underbody ,suspension component s,
wheels ortires ma yno tbe visible. Compo-
nent sdamag edinthis wa ycan unexpect edly
fa ilor ,in thecase ofan accident, mayno lon-
ge rabsorb there sult ing forc eas intended.
If th eunderbody panelingisdamag ed,0am-
mable materials suchas lea ves, grass ortwig s
can colle ctbetween theunderbody andthe 2626
Gener
alno tes
PP
er er
sonal data sonal
data
Ev eryve hicle isidenti/ed byauni que vehicle
identi/cation number.Depen dingon thecountr y,
th is vehicle identi/cation numbercan beused by,
fo rex am ple, government alaut hor ities todeter-
mine theidentity oftheow ner .Ther ear eot her
possibi lities touse datacollect edfrom theve hicle
to identify theow ner ordriver ,suc has thelicense
plat enumber .
Ther efor e, dat age ner ated orproce ssed bycont rol
units maybe attr ibut able toaper son or,und er
cer tain conditions, becomeattribut able toaper -
son. Depe nding on whic hve hicle dataar eav aila-
ble, itma ybe possibl eto mak einf erences about,
fo rex am ple, your driving behavior,yo ur location,
yo ur routeor your use patterns.
Leg Leg
alr al
req eq
uir uir
ements r ements
reg eg
ar ar
ding t ding
the disclos ur he
disclos ureof e
of
dat a dat
a
If leg allyre qu ired todo so, manuf acturersar e, in
indivi dualcases, legallyoblig edtoprov ide govern-
ment alenti ties, upon requ est and totheex tent
re qu ired, datastor ed bythemanuf acturer.Fo r
ex am ple, this ma ybe thecase during theinve sti -
ga tion ofacr imina lo.e nse. Go
vernment alenti ties areth emsel ves, in ind ivid-
ual cases andwithin theapplicable legalframe-
wo rk,aut hor izedto read out datafrom theve hi-
cle. Inthecase ofan accident, information that
can help withan inve sti gation can, ther efor e, be
ta ke nfrom theairbag controlunit, forex am ple.
Oper Oper
ationaldat atio
naldatain t a
in the v he
vehicle ehicle
This isdat are ga rding theoper ation oftheve hicle,
whic hha ve been processed bycont rolunits.
This includes thefo llo wing data,forex am ple:
R Vehicle status informatio nsuc has thespeed,
longitudin alacceler ation,lateral acceler ation,
number ofwheel revo lutions orthefa stene d
se at belts di sp lay
R Ambient cond itio ns ,su ch astemp eratur e,rain
sensor ordist ance sensor
Gener ally,theuse ofthese datais temp orary;
th ey will notbe stor ed beyond theper iod ofoper -
ation andwillonlybe processed within theve hicle
itse lf. Con trol uni tsoTen containdatamemor ies
fo rve hicle keys,fo rex am ple. Theiruse permits
th ete mp oraryor per manent document ationof
te ch nica linf orma tion abouttheve hicle' soper at- ing
stat e, com pone ntloads, maintenanc ere qu ire-
ments andtech nica leve nts orma lfunct ions.
Dep ending ontheve hicle equipmen t,thefo llo w-
ing dataar estor ed:
R Oper ating status ofsystem com ponents, such
as /ll leve ls, tirepr essur eor batt eryst atus
R Malfunctions orfaults inimpor tant system
com pone nts,suchas ligh tsor brak es
R System reactio nsinspecial drivi ng situ atio ns,
suc has airbag deployment ortheint erve ntion
of stabi lity cont rolsy stems
R Information onevents leading tovehicle dam-
ag e
In cer tain cases ,it ma ybe requ ired tostor eda ta
th at wo uld have other wise been usedonlyte mp o-
ra rily .This maybe thecase ifth eve hicle has
de tected amalfu nction, forex am ple.
If yo uuse services, suchas repair services and
maint enance work,st or ed oper ation aldat aas
we llas theve hicle identi/cation numbercan be
re ad out and used. Theycan beread out by
ser vice networkem ployees, suchas workshops
and manu factur ersor third par ties, suchas break - 3232
Gener
alno tes
do
wn services. Thesame istrue inthecase of
wa rrant yclaims andqualit yassur ance measur es.
In gener al,there adout isper form ed via theleg ally
pr escr ibed portfo rth ediagnost icsconnection in
th eve hicle. Theoper ation aldat ath at arere ad out
docume nttech nica lst at es oftheve hicle orof
ind ividual compone ntsand assis tin thediagnosis
of malfunctions, compliance withwa rrant yobli ga-
tions andqualit yim prove ment. Tothat end ,th ese
dat a,in par ticular information aboutcomponent
loads, tech nica lev ents, malfunctions andother
fa ults maybe transmitt edalong withth eve hicle
identi/cation numbertothemanuf acturer.Fu r-
th er mor e,themanuf acturerissubject toproduct
liability .Fo rth is reason themanuf actureralso
uses operational datafrom theve hicle, forex am-
ple, forre calls. These datacan also beused to
ex amin eth ecust omer's warrant yand guar antee
claims.
Fa ult memor iesintheve hicle canberese tby a
ser vice outletor atyour requ est aspar tof repair
or maint enance work. Con
v Con
venience andinfot enience
andinfotainm entfunct ions ainm
entfunct ions
Yo ucan stor econ venienc ese ttings andindivi dual
se ttings intheve hicle andchang eor rese tth em
at anytime.
Depending ontheve hicle equipme nt,th is
includes thefo llo wing settings, forex am ple:
R Seatand steer ing wheel positions
R Suspen sionandclimat econt rolsetting s
R Indi vidual setting s,suc has interior lightin g
Depen dingon theselect edequipment, youcan
im por tdat aint ove hicle infotainm entfunct ions
yo urself.
Depending ontheve hicle equipme nt,th is
includes thefo llo wing data,forex am ple:
R Mul time diadata,suc has music, /lmsorpho-
to sfo rpla ybac kin an integratedmultimedia
sy stem
R Address book datafo ruse inconnection with
an integratedhands-fr eesystem oran integra-
te dna vig ation system
R Entered navig ation destinations
R Dataabout theuse ofInterne tser vices These
datafo rcon venienc eand infotainm ent
fu nct ionsma ybe savedlocall yin theve hicle or
th ey ma ybe locat edon ade vice whichyo uha ve
conn ectedtotheve hicle, suchas asmar tphon e,
USB 0ash drive or MP 3pla yer.Ifyo uha ve ent ered
th ese datayo urself, youcan deletethem atany
time.
This datais transmitt edfrom theve hicle tothird
par ties onlyat your requ est. This applies, inpar -
ticular ,when youuse online services inaccor d-
ance withth ese tting sth at youha ve select ed.
Smar Smar
tphon eint tphon
eint egr eg
ration (e.g.An dr ation
(e.g.An droid A oid
Aut ut
oor o
or
Appl eCarP lay Appl
eCarP lay® ®
) )
If yo ur vehicle isaccor dinglyeq uipp ed,youcan
connect your smar tphone orano ther mobile end
de vice totheve hicle. Youcan then contr olthem
by means ofthecontr olelements integratedin
th eve hicle. Imagesand audio from thesmar t-
phone canbeoutput viathemultimedia system.
Cer tain inf ormation issimult aneousl ytransf erred
to your smar tphone. Depending onthetype and
int egration, this includes positiondata,day/night
mode andother gener alvehicle statuse s.Fo r
mor einf ormation pleaseconsult theOper ator's
Manual oftheve hicle/ infotainm entsystem. Gene
ralno tes
33 33
InfInf
or or
mati ononaut mati
ononautomati cfr omati
cfront passen g ont
passen ger airba g er
airba g
shut shut
o. o.
The front passen gerairbag canonlybe deplo yed
in an accident ifth ePA SSENGE RAIR BA GOF F
ind icat or lamp iso.. Ifth efront passeng erseat is
occupied, makesur e,bo th bef oreand during the
jour ney,that thestatus ofthefront passeng erair-
bag iscor rect (/ page47) .
* NO NO
TE TE
Deplo yment ofcom pone ntsofthe
re str aint system when thefront passeng er
seat isunoccupied In
an accident, thecom ponents ofthe
re str aint system maydepl oyunnecessar ily on
th efront passeng erside if:
R Ther ear ehea vyobjects onthefront
passeng erseat.
R The seat belttongue iseng aged intheseat
belt buckleofthefront passeng erseat and
th efront passeng erseat isunoccupied. #
Storeobjects inasuit able place. #
Onlyone person should useeachseat
belt atanyone time. Dependin
gon thede tected acciden tsituat ion,the
wind owcurtain airbag onthefront passeng erside
ma ydeplo y.The airbag isdep loye dre ga rdless of
whe ther thefront passeng erseat isoccupied. Pr
ot Pr
otection pro ection
provided b vided
by t y
the airbags he
airbags Depending
ontheaccident situation, anairbag
ma ysupplement thepr otection o.eredbyacor -
re ctl yfa stene dse at belt. &
W W
ARN ING ARN
INGRiskof injuryor deat hdue to
an inco rrect seat position
If yo ude viat efrom thecor rect seat positi on,
th eairbag cannotper form itsintended protec-
tiv efunction .
Eac hve hicle occupan tmus tmak esur eof the
fo llo wing:
R Fasten seat belts co rrectl y.Pregna nt
wo men must take par ticular careto ensur e
th at thelap belt neverlies across the
abdome n. R
Adoptth ecor rect seat positi onand keep
as farawa yas possi blefrom theairbags.
R Obser vethefo llo wing information. #
Alwaysmak esur eth at ther ear eno
objects between theairbag andvehicle
occupan t. To
avo idtherisk sre sult ing from thedeplo yment
of an airbag, eachve hicle occupan tmus tobser ve
th efo llo wing information inpar ticular :
R Beforestar ting your jour ney,adju styour seat
cor rectl y;thedr iver's seat andfront
passeng erseat should bemo vedas farbac k
as possible.
When doingso,alwaysobser vetheinf orma-
tion onthecor rect driver's seat positi on
(/ page89) .
R Onlyhold thesteer ing wheel bythesteer ing
wheel rim. This allowstheairbag tobe fully
deplo yed.
R Alwayslean agains tth eseat backrest when
th eve hicle isin mo tion .Do notlean forw ards
or agains tth edoor orside windo w.Youma y 4444
Occupa
ntsaf ety