Francis A. Kolnacki, 61, who had retired in 1982 as a traffic management specialist with the General Services Administration, died after a collision Jan. 11 with a Montgomery County school bus on Little Falls Parkway, between Massachusetts Avenue and River Road.

He was pronounced dead at Suburban Hospital shortly after the accident, which occurred at 4 p.m. The bus driver and all 50 of his passengers were unharmed, police said. Authorities said that Mr. Kolnacki may have died of a heart attack just prior to the crash, or as a result of the crash.

Mr. Kolnacki, who lived in Bethesda, was born in Dudley, Mass., and moved here in 1948. He was a 1944 graduate of the U.S. Merchant Marine Academy at Kings Point, N.Y., and earned a bachelor's degree at Georgetown University. He worked for the Army Department in a civilian capacity for five years before joining the GSA in 1956. He had served in the Navy reserves.

He was a founder and past president of the Washington Kings Point Branch, and was a licensed pilot and member of the Aircraft Owners and Pilots Association. He was a member of the Catholic Church of the Little Flower in Bethesda.

His wife, the former Catherine Fahey, died in 1982. Survivors include a brother, Joseph, and a sister, Cecelia Wajer, both of Dudley.