Skyhawk 172/Cutlass 172
Flight Crew Private
Flight Crew Last 90 Days 51; Flight Crew Total 71; Flight Crew Type 65
Training / Qualification
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Ground Strike - Aircraft; Ground Excursion Runway; Ground Incursion Taxiway; Ground Incursion Runway; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Human Factors; Weather
On crosswind landing had right crosswind corrections in place. Plane started settling into flare. Gust came and pushed plane left across runway. Correction did not work. Added power to go around; plane started to climb; then fell and bounced. Would not climb. Pulled power; landed in grass. Taxi light damaged. No injuries to occupants.
I was working LC (Local Control); we were landing/departing Runways 28L and 28R. [Aircraft X] was inbound from the north; I instructed the pilot to enter a right downwind; and subsequently cleared him to land on Runway 28R. The aircraft appeared to be a bit wobbly over the runway in the attempt to land; but the pilot did manage to get the aircraft on the runway. About a second later; the aircraft left the hard surface off the left side of the runway at E Taxiway into the grass between the parallel runways; taking out a runway light at that intersection in the process. The aircraft continued through the grass on a diagonal path southwest-bound and ended up on the pavement of Runway 28L; an active runway that happened to have no traffic landing/departing at the time; 500 ft. south of Runway 28R. Still not under control; the aircraft again left the hard surface of Runway 28L; off the right side of the runway; northwest-bound; coming to a controlled stop on Taxiway F in between the parallel runways.As the phone calls and various notifications were being made after this incident; the flight school that owned the aircraft said they would not fly the aircraft for the remainder of the day until the aircraft could be looked at by a Mechanic the following morning to determine what; if any; damage the aircraft incurred. Curiously; the plane was back flying approx. 2 hours later; that same night.Better training for flight students on the field. The aircraft entering the grass was not that big of a deal; but the fact that he entered another active runway 500 feet away; still not under control; seems to indicate a real problem.
Tower Controller and GA pilot reported a loss of aircraft control  during crosswind landing resulting excursion from intended runway and incursion onto its parallel.