Richard Allen Wilson Sr., 44, a health and physical education teacher at John T. Baker Junior High School in Damascus, was killed Wednesday when he was struck by a tractor-trailer while riding his bicycle in Mount Airy.

Maryland State Police said the accident occurred on Rte. 27 near Rte. I-70. They said Mr. Wilson, who was pronounced dead at the scene, was hit when a truck driven by Jack Lust Jr., of Thurmont, Md., changed lanes, and that the case was still under investigation.

Mr. Wilson was born in Olney and grew up in Gaithersburg. He served in the Navy for two years and earned bachelor's and master's degrees in health and physical education at the University of Maryland.

He began his teaching career at Damascus High School about 1959 and switched to Baker when the junior high school was opened about seven years ago.

Mr. Wilson was a member of Calvary United Methodist Church in Mount Airy, where he lived. He was a past president of the church's Methodist Men and a teacher in its Christian Fellowship Class. He also was a past president of the Mount Airy Kiwanis Club.

Survivors include his wife, the foremer Mary Jane Thorney, and two children, Kimberly Suzanne and Richard Allen Jr., all of the home; his parents, Dr. Herman M. and Lillian Wilson of Gaithersburg, and three brothers, Dr. Robert J. and Ronald H., both of Gaithersburg, and J. Randolph, of Westminster, Md.

The family suggests that expressions of sympathy be in the form of contributions to Calvary United Methodist Church, Mount Airy, 21771, or to the Herman M. Wilson Health Care Center, Asbury Methodist Village, 301 Russell Ave., Gaithersburg, 20760.