What happened
During touch-and-go pattern operations on runway 7L at the Livermore airport, a student pilot was performing maneuvers under the supervision of a flight instructor. According to the instructor, the student flared the aircraft approximately 8 to 10 feet above the runway surface and then abruptly reduced the throttle. This action resulted in a very hard touchdown.
Following the impact, the aircraft bounced, at which point the instructor took control of the aircraft and successfully initiated a go-around. After the landing, the pilot performed an evaluation of the aircraft systems to check for potential damage. Finding no apparent issues, the flight continued to the Oakland airport for refueling. It was only after arriving at Oakland that the pilot noticed damage to the left propeller. Subsequent inspection by maintenance personnel revealed damage to the left main wing spar.