RedactedNarrative: On 07/05/14 at approximately 1800, the operator was operating vessel. 1 (la-9811-fu) (pwc). The operator was towing his daughter (passenger 1) on an inflatable ski tube. The operator was alleged to be traveling approximately 30 mph when the ski tube/passenger 1 encountered a wave/wake forcing the tube and passenger into the air. Passenger 1 let go of the tube and impacted the water forcefully on her left upper arm. Passenger sustained fractures to her upper arm in three places. There was no evidence of alcohol or other intoxicants connected to this incident or the operator. 
  
  The primary contributing factor of this incident appears to be force of wake/wave. The secondary factor appears to be operator inattention. The tertiary cause appears to be no proper lookout(no observer). Both the operator and passenger were wearing uscg approved type iii pfds at the time of the incident. The operator was wearing the engine cutoff lanyard at the time of the incident in any way. The operator was issue a warning citation for failing to comply with skier requirements (failing to have an observer.