https://www.atsb.gov.au/publications/investigation_reports/2019/aair/ao-2019-019/
https://www.atsb.gov.au/media/5777834/ao-2019-019_final.pdf
The report says, ‘The similarities between the trim interrupt and flap interrupt switches and the proximal location of the two switches, unnecessarily increased the risk of mis-selection and contributed to the excessive out-of-trim condition.’
