The propellers of the plane that crashed Monday were not working when it hit the ground, according the National Transportation Safety Board.

Neither of the 1959 Cessna 310’s propellers had a power signature when tested by investigators, meaning they were not turning when the airplane hit the ground about 10:30 a.m. Monday four miles south of Calhan, said Jennifer Rodi, an NTSB investigator.

She added that the controls inside the cockpit were connected and working. The plane also had fuel, she said, but investigators were not able to recover very much since it leaked from the plane after the crash.

A more thorough examination of the plane’s engine will take place in September. The plane was moved Tuesday to a hangar in Greeley for the investigation.

William Boecking, 76, and Daniel Saunders, 60, were killed after the plane took off north from Meadow Lake Airport in Peyton and turned east. Both were certified pilots living in Colorado Springs.