On June 11, 2000, at 2204 mountain daylight time, a Piper PA-44-180T, N838PC, operated by Aspen Flying Club, Inc., received minor damage when it collided with a Cessna 182Q, N4741N, operated by its owner, at Centennial Airport, Englewood, Colorado. The Cessna 182Q was substantially damaged. The PA-44-180T was attempting to make a go-around, and the Cessna 182Q was taxiing from landing. There were no injuries to the commercial certificated flight instructor and private pilot receiving instruction aboard the PA-44-180T, nor were there any injuries to the private pilot, the sole occupant, aboard the Cessna 182Q. Dark night visual meteorological conditions prevailed, and no flight plans had been filed. Both airplanes were being operated under Title 14 CFR Part 91 by the pilots. The PA-44-180T was on an instructional flight; the Cessna 182Q was on a personal flight. Both flights originated at Centennial Airport. According to the accident report submitted by the flight instructor pilot-in-command of the Piper PA-44-180T, they were making a simulated single engine approach to runway 17R. His student "was making too many corrections," so he increased power to the idling engine. The airplane veered right, and he told the student to add power and lower the nose. As power was added, the airplane veered to the left and struck the taxiing Cessna 182Q. The two pilots landed the PA-44-180T in the grass median between the two parallel runways. According to the accident report submitted by the pilot receiving instruction, the simulated failure was to the left engine. The approach was "slightly low and slightly slow." Over the runway threshold, the instructor increased power on the left engine to 20 inches of manifold pressure. The airplane veered sharply to the right "and we over corrected to the left, taking us into the grass." Full power was applied for a go-around. As they flew over the median, they noticed an airplane on taxiway Bravo and tried to avoid a collision. The Piper PA-44-180T struck the outboard portion of the Cessna 182's left wing. The accident report submitted by the pilot of the Cessna 182Q corroborated the reports submitted by the pilots of the Piper PA-44-180T. The pilot did add an explanatory diagram.