Loss of Control of sUAS
Pilot error, automation failure, strong winds
Crash into property, injure bystanders
Occasional
Hazardous
High
Conduct a preflight checklist, limit operations to <15kt winds, and use the GPS return-to-home feature, maintain VLOS at all times
Activate RTH, land in safe area, notify authorities if UAS crashes
Flyaway Beyond Operational Area
GPS signal loss, lost link, interference
Entry into controlled airspace, potential midair conflict
Remote
Catastrophic
High
Geofencing, lost-link procedures, maintain space from controlled airspace, avoid RF interference zones
Initiate lost-link procedure, notify ATC if entering controlled airspace, terminate flight if unsafe
Collision with Nonparticipants
Low-altitude ops near people
injury to people, damage to property
occasional
hazardous
high
Avoid operations over nonparticipants, establish a perimeter, use visual observers, abort if there is a large crowd
Emergency landing in a safe zone, first aid if injuries occur, contact emergency services
Battery Failure / Fires
Overcharging, aging battery, improper storage
Loss of thrust, fire hazard
Remote
Major
Medium
Inspect batteries preflight, follow charging directions, use approved batteries only, keep a fire extinguisher on site
Land immediately if low power or battery error
Weather-Related hazards
Rain, strong winds, extreme temperature
Reduced control, system failure
Occasional
Major
Medium
Cancel flights in precipitation, check weather data, only operate within limits
Land immediately if the weather deteriorates, or abort the mission if the winds exceed limits
Obstacle Collision
Pilot error, poor site survey
Damage to aircraft or damage to property
Probable
Major
High
Conduct site survey, set altitude ceiling, maintain VLOS, use the obstacle avoidance system
Controlled emergency landing, notify if property damage happens
Loss of Situational Awareness
Pilot distraction, multitasking, fatigue
Delayed response, flight into unsafe area
Occasional
Major
Medium
Have a VO to limit distractions, use checklists
VO assumes control, lands immediately if unsafe, and has a rested crew