General Aviation News will often reprint accident reports produced by the US’s National Transportation Safety Board (NTSB), including this March 2010 report about an accident involving a Piper Twin Comanche in Baltimore (Maryland) that resulted in no injuries but substantial aircraft damage.
When the pilot was on the downwind leg of the traffic pattern for his first landing, he was cleared for a touch-and-go. However and after the aircraft touched down, the pilot applied full power and then he intended to retract the wing flaps but instead he retracted the landing gear – causing it to collapse. The Piper Twin Comanche then slid to a stop on its underside which caused substantially damage to its wings.
Hence, the probable cause of the accident was ruled the pilot’s inadvertent retraction of the landing gear while performing a touch-and-go landing while a contributing factor was the pilot’s lack of recent flying experience in the aircraft. In other words, its probably a good idea to spend more time to familiarize yourself with the controls of an aircraft you have not flown in awhile – especially if the landing gear is retractable.