A small airplane headed to Hanscom Field made an emergency landing Wednesday in a swampy area in Burlington, officials said. Two people were taken to Lahey Hospital and Medical Center to be examined. Multiple people reported a plane down in the woods off Middlesex Turnpike behind the Burlington water treatment plant at about 1:39 p.m., said Burlington Police Chief Michael Kent. The woman piloting the plane and a male passenger were not seriously injured. The single-engine Cirrus aircraft was equipped with an emergency parachute, which the pilot successfully deployed, said the Massachusetts Port Authority, which operates Hanscom Field in Bedford.