This July 2008 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.
Aircraft: STOL UC-1 Twin Bee. Injuries: 2 Minor. Location: Bunnell, Fla. Aircraft damage: Substantial.
What reportedly happened: The CFI and student pilot were practicing touch and goes on a lake. They were successful, so the CFI decided that they should attempt glassy water landings on a different lake. According to a witness, the airplane bounced hard when it hit the water and the right pontoon was torn off. The airplane swung around 180° then sank.
Probable cause: The flight instructor’s inadequate recovery from a bounced landing.
For more information: NTSB.gov