It is hard to believe but the immediate cause of this fatal accident from August 2015 was pilot in command preoccupied by taking photos with his phone and didn't notice collision course in time.
Here are the photos retrieved from his phone, the first one was taken 9:04:56
Photo #2 as he closed in at 9:20:31
Close formation flight shortly before impact 9:20:40
Photo from cockpit probably after sudden manoeuvre 9:20:41
Last photo taken at 9:20:43
7 people died – all 4 pilots and 3 divers. Two of them didn't manage to jump out from doomed aeroplane due to centrifugal forces and one lost parachute and impacted terrain.
Also MTOW of the mentioned a/c was exceeded.
All photos from final report (in Slovak):
https://www.scribd.com/doc/307016426...M-SAB-a-OM-ODQ