RESCUE PLANE CLEARS AT HANGOR,Bangor, April 29. —(/P)~ An amphibian plane, speeding to the aid of two Russian air officers forced down by engine trouble at Miscou Island, N. B„ after a non-stop flight from Moscow, cleared immigration here about 8 a. m. (FJST) today and proceeded on to Moncton, N. B. The plane, piloted by R. W. Fall of New Yorkand carrying a party of six, is owned by Harold S. Vanderbilt.CANADIAN PLANE UNABLE TO LAND.Moncton, N. B., April 29. (Canadian Press) Observers in a Canadian Airways plane repotted today they had been unable to land on Miscou Island where the Russian Moscow-New York place, piloted b,\ Brig.-Ceil. Vladimir Kukkinaki was forced down lust night. .