PI'OJCCT 10073 RC('Q1, . 1 . ._:,.CATION .1. CONCLlJ)lONS . I J. DAl f:TIME GROUP 7. L ENGT H OF OBSERVI\TION , a. n PE O F OBS!:RV:.-tCtl Ground Vi ~uol ({o s Boll oo n ::'ro!>obl y Edlcrr Poss1blr cclce" Wo!; Aircr::'t Probohlr ,'.,,,.,~ft Pos~<ibl~ 'rcro(l r\L/o.':-lER OF 06JEC7~ 9. :-:URSE 0 Doc for Evol&.c:ttc n In suffl cl er11 . ,..J, th; CC ::.~r v)c vat ion .. ObJOrl r'a~i.n. out of sir~ht. nvid SC'lll1 l!'lli~l l'l. Infon.c.:. . confli<t~ on tr.~.. f C"lC"at)n!' 0 .. rjlJ<' 'i.h\. o::~.'il1llon. t.rav~..oJlc relurnciJ~