On August 30, 1996, at 2025 central daylight time (CDT), a Globe GC-1B (Swift), N570SR, while taxiing at night after landing, was struck by a 12 year old boy who was riding a mini bike on the taxiway. The boy received fatal injuries. The pilot was not injured and the airplane received minor damage. The 14 CFR Part 91 flight had departed Poplar Grove Airport, Belvidere, Illinois, and had landed at Casa de Aero, a private airstrip near Hampshire, Illinois. Visual meterological conditions prevailed and no flight plan had been filed. Two aircraft had departed Poplar Grove Airport at about 2005 CDT en route to Casa de Aero. The first plane to depart was a Piper Arrow. The second was the Swift. The Swift overtook the slower Arrow and proceeded to land at Casa de Aero. The pilot of the Swift reported that he landed on runway 09 and rolled out to the east mid-field taxiway. The aircraft made a left onto the cross taxiway, and then entered the north taxiway and proceeded westbound. The pilot reported that the Arrow was on final approach for landing to runway 09, so he turned off the Swift's landing lights so as not to blind the pilot of the Arrow. The pilot reported that he left the Swift's position lights on. The pilot reported that seconds after the Arrow had passed behind the Swift, he felt a collision with something. He shut down the engine and got out of the airplane to investigate. He reported that he discovered a 12 year old boy and an unlighted mini bike under the aircraft. He reported that the boy was severely injured and he went to get assistance and call 911. The passenger in the Piper Arrow reported that the Swift had stopped and turned off its landing lights and strobe lights about halfway down the taxiway. He reported that the Swift was moving very slowly, or perhaps, not at all. As the Arrow turned off the runway, the Swift pilot made a radio transmission indicating that he had hit something on the taxiway. A witness reported that the boy had been at a friend's house on the west end of the field. The boy was returning home on his unlighted 3.5 horsepower mini bike. He was wearing a helmet with a full face, clear plastic visor. The mini bike collided with the airplane on the center of the taxiway. The mini bike traveled underneath the aircraft's left wing root area. The boy survived the collision but died about two hours later. Personnel Information The pilot was an airline transport pilot with about 10,056 total flight hours and 482 hours in the Swift. He had a total of about 1,950 hours of night flying experience. He held a current First Class Medical Certificate. Aircraft Information The aircraft had 3060 total hours. The last annual inspection had been conducted on June 2, 1996. The aircraft had landing lights, strobe lights, and position lights. Wreckage and Impact Information The examination of the accident site indicated that the mini bike had impacted the airplane in about the center of the taxiway. The airplane's engine cowling was dented above the engine exhaust stack. There were impact marks proceeding along the belly of the aircraft near the left wing root. Additional Information The residents of Casa de Aero, a residential flying community, had established rules governing the use of taxiways and runways. A set of rules was published for children. The rules included the following points: 1. Cross the runway at the ends only! Stop look both way by turning head. 2. When riding a powered vehicle remember it is very hard to hear airplanes. 3. To travel between taxiway and road use your property only. 4. Inform guests they may ride bikes on the taxiway only with you or someone from Casa de Aero. 5. Bicycles and toys must be kept clear of taxiway as all times. 6. Keep in mind there is an active grass runway between the taxiway and runway. 7. Absolutely no playing on taxiways or runways at anytime. There was no prohibition listed in either the Children's Safety Rules or the Airport Rules and Regulations concerning the use of bicycles or motor bikes on the taxiway at night. There was no rule, or note of caution, in the Airport Rules and Regulations concerning the use of landing lights while taxiing at night. There were no parties to the investigation. The aircraft was released to the aircraft owner on September 6, 1996.