Mechanics work on US aviator Lt. Lowell Smith's plane during air squad's flight around world

Pan across Lt. Lowell Smith's airplane in hangar, another airplane parked next to it facing it / two men working on plane / man using cart pulls new airplane engine from container as Smith watches, Smith takes wrap off engine / two shots of men placing new engine onto nose of plane / men placing radiator on front of engine / outside hangar engine is started and propeller starts spinning / mechanic on top of engine inspecting it as propeller is spinning / men rolling pair of pontoons for plane on cart towards plane / men carrying pontoons to position under plane / pulley mechanism holding up plane after pontoons have been attached / Note: exact month/day not known