Date: 30 Nov 98 03:07:31 From: email@example.com (John Wright) Organization: Janet, me and our cats in our little cottage References: 1 2 Followups: 1
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On 20 Nov 98 02:30:43 , in <airliners.1998.1769@ohare.Chicago.COM>, C.S. wrote: >In the german TV a report about the El-Al crash stated that many local >residents near the crash site develloped in the meantime symptoms linked >to radiation-exposure. The program concluded that the counterweights >used by the 747 were made of uranium, and that the radiation spread >around through the resulting fire. > >In the program, Boeings official comment was that the _actual_ >counterweights are made of steel. Does anybody know which material was >used to balance the earlier versions of the 747 ? When I was briefly associated with British Airways in the field of radiation protection*, the only aircraft that I was aware of in the BA fleet that used depleted uranium mass balance weights was the L-1011. BA's fleet at the time included the -100 -200 and -400 versions of the Boeing 747, not to mention 737-200, 737-400, 757, and 767 amongst a host of others. Mass balance weights are used to increase the flutter speed of an aircraft's flying controls, and as such must be matched to the control. This occasionally requires machining and other operations on them and if they are depleted uranium special facilities must be provided so this can be done safely. * An airlines involvement with radiation mostly involves the non-destructive testing of aircraft components, and radioactive isotopes carried as freight - these have special labels as approved by IATA, not to mention having to be carried in approved containers. -- John Wright "There's spam egg sausage and spam, that's not got _much_ spam in it." "I don't want *any* spam..."