Two of the injured passengers were taken to Kelowna by air ambulance, a spokesperson for the B.C. Ambulance Service said. Paramedics flew the third to Royal Inland Hospital in Kamloops by military helicopter, a spokesperson said.
The plane — a PA 30 Twin Comanche — departed from Penticton and was heading to Boundary Bay airport, near Vancouver. It went down near Brenda Mines, according to Annie Djiotsa from the Rescue Co-ordination Centre in Victoria. The cause of the crash is not known.
A Cormorant helicopter from Canadian Forces Base Comox located the crash site, after a signal from the plane's emergency locater beacon was received, Djiotsa said. Emergency crews then parachuted into the area.
The Transportation Safety Board will investigate the crash.
Earlier this year, three people were killed in a float plane crash in the same area.
In that case, a single-engine de Havilland Beaver went down in a heavily-wooded area in May. The cause of the crash is still unknown.