Tours are limited to no more than 10 visitors when Andrew Johnson National Historic Site (NHS) transitions to its spring hours of operation beginning Friday, according to a news release.The park will be open from 9 a.m. to 4 p.m. Wednesday through Sunday and closed Monday and Tuesday.The Andrew Johnson National Cemetery will continue to remain open seven days a week, 8 a.m. until dusk.Guided tours of the historic Andrew Johnson Homestead, located at 209 S. Main St., will resume Friday. Guided tours will be offered at 10:30 a.m. and 11:30 a.m. and again from 1:30 p.m. and 2:30 p.m.