The engine in the plane that crashed into a North Las Vegas home last week was no ordinary engine. A preliminary report from the National Transportation Safety Board says the experimental plane had a supercharger, an engine not normally found in experimental planes. News 3's Marie Mortera went live to the crash site.

The supercharger engine was being used for the first time during the fatal flight, which crashed into a home just one mile away from the airport runway. The National Transportation Safety Board says the owner and builder of the plane revealed that the experimental plane's engine was equipped with a supercharger to help increase power.

According to FAA rules, initial flight tests using a supercharger are supposed to be conducted away from densely populated areas. According to the report, just weeks before, the owner of the plane said it was tested multiple times with ground and high-speed taxi tests.

A logbook entry for March 17 says that the "plane meets all safety checks." The home-built plane had just over its minimum of five hours of airtime, as required by the FAA. But still, something went horribly wrong.

The owner of the plane, identified as Mike Killgore, told the NTSB that the flight was merely supposed to test the performance of the plane with the supercharger. Unfortunately, that test turned tragic when pilot Mack Murphree, Jr. told air controllers he was "going down."

Friend Ron Sutton says Murphree was 100 percent conscientious about what he did and was so experienced that it couldn't have been pilot error. Sutton claims that there was no way he would fly the plane if he felt it was unsafe. He doesn't believe it was pilot error that caused the plane to crash, but perhaps something to do with the enhanced engine.

A spokesperson for the maker of the Velocity aircraft says the company doesn't sell engines and notes that superchargers are not commonly used. And according to the FAA, the aircraft could only be operated out of the North Las Vegas Airport in a limited way: not flown over densley populated areas except for take-offs and landings.

This, however, was not reassuring enough for local airport officials. "I do not believe that, under our circumstance, experimental aircraft and high risk aircraft operations such as training and solo flights belong in an urban airport," said Randall Walker, Aviation Director at McCarran Airport.

Wednesday's preliminary report is just the beginning. The NTSB says it will issue their final report within the next six months.