22-10-2012, 04:28 PM
A Summary of Unmanned Aircraft Accident/Incident Data: Human Factors Implications
ABSTRACT
A review and analysis of unmanned aircraft (UA) accident data was conducted to identify important human factors issues
related to their use. UA accident data were collected from the U.S. Army, Navy, and Air Force. Classification of the accident
data was a two-step process. In the first step, accidents were classified into the categories of human factors, maintenance,
aircraft, and unknown. Accidents could be classified into more than one category. In the second step, those accidents classified
as human factors-related were classified according to specific human factors issues of alerts/alarms, display design, procedural
error, skill-based error, or other. Classification was based on the stated causal factors in the reports. the opinion of safety center
personnel, and personal judgment of the author. The percentage of involvement of human factors issues varied across aircraft
from 21% to 68%. For most of the aircraft systems, electromechanical failure was more of a causal factor than human error.
One critical finding from an analysis of the data is that each of the fielded systems is very different, leading to different kinds
of accidents and different human factors issues. A second finding is that many of the accidents that have occurred could have
been anticipated through an analysis of the user interfaces employed and procedures implemented for their use. This paper
summarizes the various human factors issues related to the accidents.