Preference and operational acceptability of Flightdeck Interval Management avionics

The particular tone used conveyed moderate "urgency" and was not particularly "annoying." Those who rated it most inappropriate did not rate it as annoying. VAV users rated it as more urgent. 92% of subjects indicated a preference for aurals to at least one 1M event. Only one from VAV and one from AAA did not - all VVVs did! Subjects who received aurals for all 1M events provided higher preference ratings for use of aurals than VAV, and those in VVV conditions. Aurals had perceived positive effect on general situation awareness.