The Accident and Incident report of IATA for Commercial Air Transport covering a period from 2013 to 2017, has reveald that manual handling was a factor in 34% of the events. The following survey is to be used by IATA in an effort to analyze systemic weaknesses and examples of best practices in order to develop guidance and recommendations to the industry.
https://www.surveymonkey.com/r/AircraftHandling