The Transportation Safety Board has ruled out engine problems as a cause in last October's crash of a small plane into an apartment building in Richmond, B.C.

Bill Yearwood said the aircraft controls and connections have also been examined and there is no evidence of mechanical problems before the plane smashed into the ninth floor of the building.

"We've examined the engine and determined they were both delivering power at the time of impact,'' he said.

He said the investigation is continuing and other factors, such as the pilot's flying record, are being examined.

"We've been looking at radar data. . . but we've had to rely on witness information to get the vertical information, like altitude (the plane was flying,)'' he said. "We have to look at the map that may have affected the human performance during the course of the flight.''

Pilot Peter Garrison, 82, died in the crash.

Residents of the building filed a class-action lawsuit after they learned they would be out of their homes for up to six months.

Their lawyer said some of the residents didn't have home insurance and the lawsuit was the only way for them to be compensated.

Garrison, his estate and airplane manufacturer Piper Aircraft are all named in the lawsuit as defendants.