What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
During a scheduled flight test at the Pendleton UAS test range, it was observed that the aircraft was not maintaining altitude as anticipated. The RPM indicated that the engine was experiencing a stuck throttle condition. An attempt to recover the aircraft was made but the aircraft missed the recovery system and impacted the nearby ground. No personnel were injured.
As the FAA filed it
DURING A SCHEDULED FLIGHT TEST AT THE PENDLETON UAS TEST RANGE, IT WAS OBSERVED THAT THE AIRCRAFT WAS NOT MAINTAINING ALTITUDE AS ANTICIPATED. THE RPM INDICATED THAT THE ENGINE WAS EXPERIENCING A STUCK THROTTLE CONDITION. AN ATTEMPT TO RECOVER THE AIRCRAFT WAS MADE BUT THE AIRCRAFT MISSED THE RECOVERY SYSTEM AND IMPACTED THE NEARBY GROUND. NO PERSONNEL WERE INJURED.