Question to the Department for Transport:

To ask the Secretary of State for Transport, if he will take steps to collate data on aircraft accidents in commercial operations in which colour vision was a significant factor over the past twenty years.

The Department policy on colour vision is derived from a range of evidence, including but not limited to accident data. This is used to set requirements based on the fact that the perception of colour cues in the external environment is key to safe performance of flight duties. The Department believes there would be little benefit to conducting such an exercise, as knowledge gained from air accident investigations is already reflected in UK policy.