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Show Aviation Expert Advises Probe On Airlines' Slight of Radar CAB Chairman James M. Landls. Tha C A A carries out safety regulation! regu-lation! framed by C A B and must approve flying: alda before they are used by air lines. Sibley's letter apparently was written before the TWA crash. But radar exponents regarded the acoldent on the basis of facta now available as further evidence evi-dence of the need for the proposed Inquiry. I Despite a. long record of misfortunes mis-fortunes since going- lnt6 airline service In February, Constellation aircraft retain the best passenger safety record of any plane now I Hying, aviation authorities said. Until Saturday no passenger had ever been killed In a Constellation although the models now in service serv-ice have flown more than 300 000,000 passenger miles, domestically domes-tically and Internationally. Charles X. Stanton, civil aeronautics aero-nautics deputy administrator, told a reporter he personally was "perfectly "per-fectly well satisfied" with the explanations ex-planations that have been forthcoming forth-coming and that he aaw nothing that would Justify grounding the planes. By CHARLES CORDDBT WASHINGTON, Dec. SO (UP) An investigation of delays in adapting radar flying aids to commercial com-mercial aviation was urged Monday Mon-day in the wake of the costly Constellation crash near Shannon airport, Ireland. Surviving crew members of the Trans-World Airline plane reported report-ed it suffered no apparent mechanical mechan-ical trouble before plunging through low-hanging clouds into a boggy river Fergus isle last Saturday. Sat-urday. This and other information led government and air line authorities authori-ties here to believe that the crash, which killed 12 persons, probably was due to bad weather with an added possibility of some pilot error. Whether they are right will develop In an official investigation investiga-tion due to megln at Shannon next month. Robert B. Sibley, New England area governor of the Aviation Writers' Asan, meanwhile proposed pro-posed a Civil Aeronautics board inquiry to determine why radar devices used' in bad weather by the military services have not been applied to civil aviation. The CAB ahould investigate why the Civil Aeronautics administration admin-istration "insists on 'experimenting 'experiment-ing belatedly" with radar -when it already is ready for routine use, Sibley, aviation editor of the Bos-ton Bos-ton Traveler, aald in a letter to |