than the He2l's, 3-35 a . The Hel9 was the >rimary aircraft for rad-safe surveys and sample recoveries in high raciation fields Lecause the enz re position . r reduced the radiation hazard to the nilot to about 0% of the H-21 exe v posurerate. - ‘on we © ° “Ase, Myz vr -_7 ogee ae a fu rf fan oo aw 7 , . _ t At tuestart of th theoperational period, ni ht flizhts and overawitur flichts were generally arranced with no creat diificulty, fortun:te Hel9 accident in which. After the une _..3 of UCRL was killed on 7 Avril, there were so many restrictions placed on ii-ht and overe-water fly- ing that. i€practically stoned. Personal examination by CTG 7.4 of re= quests for such flichts res:lted in nany celays in getting TG 7.1 require- ments accepted. In manyevents, ‘articularly ‘Jahoo and Umbrella, the var- ious scientific projects were hamstrung by the limitations on helicooter operations, This was relieved somewhat by use ofmarine helicopters which had fewer overational limitations. ° The major problem was that arrangements made tetreen the TG 7.1 and TG 7. staffs were frequently cancelled by J7G 7.4 shortly Lefore the vlan~ ned t‘'me of execution. To experimenters onerating on a closely timed schedule of events, such cancell-tions were almost ruinous, After many dis- cussions between J=3 of TG 7.1, CTG 7.4, and finally J-3, JTF SEVEN, TG 7.t/ developed a noticatly less reluctant avproach toward supporting TG 7,1 re= quirements, This became evident during may; and, by the zee of June, the situation had improvec to the point where staff level arrangements could arain satisfy nost onerational requirements. / On4 July, =n a discussion teduoon’ the Jo} Section-ef TC 7.1,end-asr“ ortif pF pat le SK po a, LPF tae t ey ~ Tee epasthenS SRAthe! term "secial missions" At wae dotisedy elim — wy aa ee Tocn, ““aiatar “fli:“hts, requirinz hovering over open water, wae missions", Pla! bpwca. . i vere defined as “special AO bee far, All other flights were defined as routine, and could be handled ty the HIN cisostcher at the Elmer airstrin. op Fat te, — AK tN Ee Mae eer log Special requirements Bacto LANL RE ° fbOrre. é Tet =: | do / rr LW5e 4 weored Pate TG Tel Air Operations sereneGn—vimes-~one:‘Gaye-emr'shot Ways, COPIED/DOE ace [At £ Ke eel? PAGE vows? :