This was posted in Beechtalk
I am based at Banning and was in my hangar working when this happened. Nobody saw it but the locals said it was a Cessna 172 with instructor and student on board doing T&Gs. They were on downwind about midfield when the crash occurred. From the news video the debris field is very well contained which to me would suggest a stall/spin. Conditions at the time (from the ground) seemed very benign. Clear skies, no T-storms, wind out of the west as usual at about 10-15. I will say this however, the wind shifted to an East wind at about the same intensity or maybe more, about 45 minutes later. Thought about taking the Bonanza up to get a better look afterwards but I've endured more than my share of this kind of crap. Nothing left to learn from watching. RIP.