The crash happened at about 12:30 p.m. on the Ottawa River.
A 71-year-old pilot instructor was flying the plane at the time, said Gatineau police spokesman Sgt. Jean-Paul Le May. A 27-year-old student was in the passenger seat.
The two men were taking a ride and were not in a lesson.
After the crash, which happened a few moments after takeoff, the two men were helped to shore by boaters nearby. They both suffered serious injuries and were taken to hospital, Le May said.
On the Ontario side of the river, the scene was just east of Cumberland, Ont., near Canaan Road. On the Quebec side of the river, where the occupants of the plane were taken to, the scene was off du Fer à Cheval Road.
Correction : An earlier version of this story referred to the incident as an emergency landing, based on information from Gatineau firefighters. Gatineau police later said the incident was a crash and that the two men suffered serious — not minor — injuries.(Jun 06, 2015 2:51 PM)