The accident investigator observed that unexpected events, such as user slips and mode errors, are commonly considered as human errors.

It employed the skills of an expert pilot, an expert accident investigator, an aviation meteorologist and an aircraft structural engineer.

Accident investigators launched an investigation into the crash at the weekend.

The police van remained in situ for a number of hours before accident investigators allowed it to be moved and the police cordon was lifted.

Accident investigators concluded that the lack of a collision warning system onboard had contributed to the accident.