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About Medford mail tribune. (Medford, Or.) 1909-1989 | View Entire Issue (Sept. 19, 1962)
WEDNESDAY. SEPTEMBER 19. 1962 A 9. United Airlines Questions Use of Foam in Belly Landings Washington IUPD United distributed to its flight crews. generally of 10 parts of air to one part of water. "From this it is obvious that a two inch blanket of foam contain ing over 90 per cent air can not form a 'cushion' for an aircraft as it touches down. The ease of touchdown is strictly pilot technique." United said the Navy ex periments also showed that foam, as it is generally com pounded, is not a particularly good lubricant for decreasing friction. It pointed to tests in which fuselages were dragged first on a dry runway and ables as the type of runway construction, the type of air craft metal and the depth and age of the foam. It cited the Navy tests as demonstrating that both a thin foam layer and a thick one have little effectiveness in preventing fire. "It was also discovered that any breaks or bare spots in the foam blanket would allow the metal to start sparking, causing ignition of the fuel mist, and the resultant fire would not be extinguished when the test sample reenter ed the foam area," the airline seven fires in 34 landings made without foam, j Statistics Look Good I "These statistics look good !for the case of foam," United was not telling pilots never to ask for foam coverage. It said the final decision is still left to the captain. And it ad vised pilots to take various factors into consideration particularly the length of timo in which it would take airpoii workers to spread foam on runways used by jets. . Airlines has questioned t h use of one of aviation's oldest safety devices spreading foam on runways for belly landings. For a major air carrier to challenge runway foaming was roughly the equivalent of denouncing virtue. But Unit ed, citing recent tests by the Naval Research Laboratory, said many of the alleged ad vantages appear to be fiction. Its criticism was made in "The Cockpit," a newsletter It said runway foaming is used because of a widespread belief that (1) it forms a cush ion for a disabled aircraft, (2) it decreases the friction be tween the aircraft and the runway as it slides on its belly, and (3) it reduces the chances of fire. May Be Exaggerated United said the Navy tests showed these so-called advan tages may be exaggerated. It said foam does not form much of a cushion; that it consists then on one covered with foam. They indicated a differ ence of only three per cent in ability to reduce friction which United noted compared favorably with the friction decreasing qualities of a run way covered by water in a rainstorm. Depends on Variables Nor is foam a completely efficient agent for suppressing sparks andor fire. United said. Much, the airline ex plained, depends on such vari said. United quoted a Navy sur vey of belly landings made on runways at U. S Naval air stations. The statistics showed 16 wheels-up landings made on foamed runways that re sulted in only one fire. In 70 belly landings made without foam, there were IS fires. Available U. S. Air Force records, it continued, show one fire in 24 landings on foamed runways. There were LOSES ALL AROUND Shawano, Wis.-OIPD-The law enforcement c o m m 1 ttee of the county board of supervi sors plans to study Sheriff Carl Krueger's demotion of deputy Edward Bahr. Bahr, who un s u c c e ssfully ran against Kruegcr in last Tues day's primary election, wai demoted for "insubordina tion." said. "Unfortunately, howev er, records were not available for these instances showing the number of times fuel was spilled due to rupture of tanks or lines. Since spillage of fuel is a prime requisite to having a fire, these favorable statis tics are subject to quite a bit of critical comment." United emphasized that it Q. AND A. 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