What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Company was flight testing multiple UAS compiling information to submit for certification iaw usc 44807 cmd process. A flight plan command was submitted to two separate UAS at the same time, one was registered with the traffic management software and the other wasn't. both received the same flight plan and they flew the routes and collided. Secondary contributions found by the investigation detailed (1) the aircraft were supposed to be offset by altitude (50'), (2) they were supposed to have been separated on parallel routes, (3) the visual observers (vo) failed to adequately determine the heights of the UAS prior to the collision, and (4). The vo's failed to only perform their one task of traffic separation. The vo's were multitasking and not maintaining visual contact with the UAS.
As the FAA filed it
COMPANY WAS FLIGHT TESTING MULTIPLE UAS COMPILING INFORMATION TO SUBMIT FOR CERTIFICATION IAW USC 44807 CMD PROCESS. A FLIGHT PLAN COMMAND WAS SUBMITTED TO TWO SEPARATE UAS AT THE SAME TIME, ONE WAS REGISTERED WITH THE TRAFFIC MANAGEMENT SOFTWARE AND THE OTHER WASN'T. BOTH RECEIVED THE SAME FLIGHT PLAN AND THEY FLEW THE ROUTES AND COLLIDED. SECONDARY CONTRIBUTIONS FOUND BY THE INVESTIGATION DETAILED (1) THE AIRCRAFT WERE SUPPOSED TO BE OFFSET BY ALTITUDE (50'), (2) THEY WERE SUPPOSED TO HAVE BEEN SEPARATED ON PARALLEL ROUTES, (3) THE VISUAL OBSERVERS (VO) FAILED TO ADEQUATELY DETERMINE THE HEIGHTS OF THE UAS PRIOR TO THE COLLISION, AND (4). THE VO'S FAILED TO ONLY PERFORM THEIR ONE TASK OF TRAFFIC SEPARATION. THE VO'S WERE MULTITASKING AND NOT MAINTAINING VISUAL CONTACT WITH THE UAS.