About 40 design firms and companies making planes and engines from Russia, Ukraine and Uzbekistan will take part in Britain's Farnborough Air Show next month but cash shortages are keeping others away, officials said Wednesday.


The officials, from exporters and coordinators Aviaexport, said Russian participation would be half that at the last show.


"For the first time no Russian military helicopters will be on show because helicopter manufacturers do not have the money to pay to be at Farnborough," he said.


One casualty of the cash shortage is the Kamov helicopter design bureau, which has displayed its K-50 Black Shark helicopter at previous shows but which now faces financial difficulties because of falling state support.


"It is rather expensive for us to participate in this air show," said Kamov vice-president Veniamin Kasianikov.


Russian passenger planes on display include the new Ilyushin-96M, equipped with Pratt and Whitney engines, and the modern Il-103 light plane.


Tupolev will show its medium-range Rolls Royce-powered passenger plane Tu-204, officials said. Military planes will include the Sukhoi-27 and Su-35 fighters and the Su-30 training fighter.


Mikoyan design bureau will present the MiG-21-93, MiG-29M and the MiG-29Mse, a special export version. It plans a series of test flights to show what the planes can do.


"We also plan to show our most modern developments of equipment, engines and navigation systems for civil and military planes," an Aviaexport official said.


Special planes include Myasichev's M-17 Geofizika, used for geological research, and a "flight laboratory" based on an Il-76.


Ukraine's Motor-Sich and Progress plan to have new engine lines on display and an Uzbek firm presents its Il-114 short-range plane for 60 passengers.


International air shows are an important venue for Russian producers, which are seeking new export markets since the breakup of the Soviet Union deprived them of many of their traditional customers.