Authorities are searching for an inmate serving a 40-year sentence for a drug conviction who drove off prison grounds on a tractor.

Arkansas prison spokeswoman Dina Tyler says 62-year-old Charles Wilson escaped from the Cummins prison at about 11:30 a.m. Friday. Wilson was a prison trusty, and his job was to drive a tractor on the prison farm.

Tyler says Wilson's tractor was found in good condition about a half-mile from the prison on a gravel road off U.S. 65.

Wilson was convicted in Pope County of two counts of manufacture, delivery and possession of a controlled substance and one count of possessing drug paraphernalia.

He is described as white, standing 5 feet 11 inches tall, weighing 188 pounds, with thinning brown hair and brown eyes. Wilson has a medium build and wears glasses.