Never mind. I am sure passengers were no more baffled by that than the regular pre-departure announcements that the aircraft are "trim sensitive". Two Flybe flights last week and the different passenger sitting next to me on each one asked me if I knew what "trim sensitive" meant. One crew member overheard and very polite though she was, didn't understand enough herself to be able to explain it in layman's terms to the poor confused chap sitting beside me.