i ~ ~- ,: Y J.J\SSI Fl EO DO\YN<1~AnBD l ... "l DECLl' ... S~lFJ ED t Jt.JCl.ASSlriED DA.DqtJ!.1muJ S903D RADAR BO:!dB SCORim GROUP Carewell Air Force llonort of Inc i dent Co.:1 1<:\nrlinz C'ren~r~.l Strat'.!3ic Air Com;nand Offutt /dr Force Bn.~e Uebrasl ... a Baoe, I'ort Worth, Texa~-------~ 1. 1'he foJ.l ouine ar~ t nc k"lo:m fac t:.; concerninc 0n unl....:.ont.~.:'l<!d p ) ct, Lon.:d a t Crt:?:Jit'J Cj t.y in~:lneer D3pot , Graoi t City , Illi nois 0 11 the n i..r,;ht of lJ i"C!br.t.:n.".)r 1952 ''urine t he eva l tia(.:i.on- mi G3l'on t.Lno !-:chcdnl~d 'or U!~ ~ a. Aircra ~t, 8'J95 HC: s c lr:!arc d 1'J.'0!1 the l P v.~ Jnd:r;;o~lvlll:.;, Illj_nois, pr~sr1ure ult n,udc of 29, 0 0:) fe~t, a t n rn::1cc of.' D-uou t 75 milc::s .f'ro;n th2 ::en site, on a t r ue cou.r!~J o f 180 ut abo i:. 223 0 ~lO'.lrG ..;<_;Teo b. Gro"J.nd-to- air r nn.a r co:1tact ~J.'.:\S 0st.=-1bli~!1-::~::l vJ.'~th a .. :n G;,n !l~nv.:tl, the a n_3le of elevation<. :ll1-1.1ilb ~l~JrH3.'1:c: <.l t.o C\!"J)J.'o;:i.nat.e t!1e alt i. t't:!3 0 : t be aircrzJ.'t c :L(:[!r c d fo:c the ri.U1 -?.nd the aJ.::r;)rO<'.C~ of t.: !c as r e port a d b;r the clc~r\.;d a :ircraftco c. The "tarc;cttt uas loc!w d i n automatic tr<tc!dllf?: at abolt. ort y miles fro"7! t he t:i.. tn, nt Hhich ti:'t~ a~1 alti.t'l...d.e cl1cck " a;, !)ossiblG; a u aJ.cj.tude of L'J ,000 :fee t \ 1as read b,<r use o l.' a douhl~r cont.:rol i.n t:w al~itude ci:-c' t'Lt. lJue to t..,v; fnct t h.:::tt th~ pro.~r(~:Js 0i' t,1}e u t.~<~i; " t alonz t 1e r u1 u:;> to t118 aut o"1at-tc t1ack:i.nc r anz:-: a Jr>~ar : d no..r:nal) i t ~1as t ansUi";'l::d ~.hat t ite X- 2 altit'.t:.l3 doubler c .:.r-;,tit '.iaCi :ino~ ra:~iv~. d . 'i'J,c " tJ..ccc't " c..:>n.tinuod to pro.:;resJ a t o. ~orm::l1 t;ro.l!1u S_9E;ed and h(.:~ldiPg to t~1e ::;i;:,e nrv:l t:-J: c"l:. ar c<' 1.mti l a orc.c:i.~ tcly t.1cnty :nilu s fro.1 the slte, excont. for thG 0'l0~;t ona'l:l.Lc a l t ;_t i.t. abou t t11n;d:.;. nilcn f 1' 0 !n c:~ sccndinG. plotting c1uin.n~nt H"'; rr.rLtc~vd D~CLASSIFIED A PTZ 12 YB.Ah;:,. DOD DlH 52CJO.l0 CCl ) i. ., I J l ii ~ n.i:t. i '\lJ y tlt L' -i. d t.~ct .blo :u\J j t rH ; <l' l.cr ~ e; st. :tL ineid.c.rn~ coultl '1nt be \;Clrlii..ud to i.i13 .,.,..01111 r .rl ':t'. ':J:l s trr\'i.Jl.Ln~ sJ~orl o:r l0'1Q m:tl~s o:-;:c ho,:r 0.udn~ it:~ 'Jlo 't-.d ell :-mrt., c onpon!nt o.f its s::,c. d r{ ;ist.<Jl'ed 924 ni lr:..:; p..;l' ho~':L' i~, as;Jn-:!d ttl~t. (,h ~ t.C'll' .:t UNCLASSIFIED (U) Unidentitiad R~l'lr ll~tu.t-r:..:t ft.:,~ nuJ::'tioi(;tAt f o r 1.\li\,~a:tu 1?\lli)03~lJ. 'f!'o't." j'"l: oLnCtt in"\'lc~C.ell "~t t l'..tr8 u:l.S a t'..!l.:.x~r:li;ur~ in:v-..-:raion f.ltul EA. llOiatur~ lJ...?~a o:~ g"vou.t :,;:;, i;.:...oo;~ o.4 th4t :l.nc iilt:tnt. C:...~liil l~:: l1dr condit#lon col\ll C'lU.J~ J.u~l-t.r Grou.:1J. c ur.t~r ~:.t:_:c. ... ~J t.:> [::'..lUnd. l'l!turn o~b 1-~r" l'c-:c~lved. o.nd vhich ch illl811 vi t h !' ~ight a::et "~..::i.D:rta:atu:e, p;\.:!~.3w'C'!, c .... "ll uolnt.ur~ cvatc-:11~. "~:!.C@8~ ive l'ofr.:~.c tion cccu:!'s -rrhen t'.;e"L"''! :i.tJ a r:- l'.:1, .;ht (:;oi$tllre !a:y~d) t'l:ld to n. l033~r d23:rea, ';T!.!en til.~ra ii l:l rc~.!?i~ i i !C!.._;a.:Jd of t "!.!TJPttrature ui~ he:t;!ht ('t,)r!tpe-"'!l'tu~ 1nlat'9ion). 'Ir:~ l'O~Jt :.n~onou1..e~rl C.:\3.:r3 c1 (...<t;el'laiv ~ l..:.::?r:i.etion occur uh~n bo::o of t:1.::oa conU.H~ion~ p:."'~\T~.il D.t ., h d r."'1Ina .. G~." rl'tli.a CCJm!lt:tnt in cla.ar.t.ii"~.~d, - 1lt?.r(;z.i_1)., .f UNCLASSIFIED C~iaf, ~ftai3tion :~ctivn . , "v~ lJNClASSlFlED UNCLASSIFIED TI EE (Local): l}n no:.:l Un~i1 o:rn A.CTI ON OR CO::Jf!J.!TS: Fc .. 1d:i.n.: D'2SCRIP':'Im J OF I~JCIDEr:T: Do' b 3corl' Gr(.) u p obs .n:vJc~ t:rru. ~u: J rac' :~.r ~LLe.pL.iP'~ t.r.> score hnl:1i1 r1~n. -.:?.~t'!ell~,. UNCLASSIFIED ElTRACT mJl-1 STATUS REPORT II ? _ I~GTH OF TilrE OBSERVl:D: ACTI 0~ OR COl!llENTS: DF.SCRIPTION OF INGrDENT: I JNCt)\SSJFlEO