The probable cause of the crash that killed the two occupants of a Piper PA–28R-201 after a wing separated from the airplane in Daytona Beach, Florida, in April 2018 was determined to be metal-fatigue cracking associated with flight training maneuvers and frequent landing cycles, according to a National Transportation Safety Board final accident report.
Source: aopaReport cites metal fatigue in 2018 Piper Arrow crash