one is if you have a rapid decompression and the pilots are not able to get on their auxiliary oxygen masks fast enough. or it's such a catastrophic depressurization depending on where it occurred in the plane and so they pass out. apoxia lack of oxygen. the second reason could be some kind of smoke or fume event, a fire on board, which again, the pilots have emergency oxygen but sometimes it's so quick, and the plane can fill up with smoke and fumes from a fire very quickly. so those are the two things that have happened in the past. >> the european air safety commission recently issued a warning about something they discovered that could put a plane into a descent. do you know anything about this? >> yes. what they had looked at and the united states federal aviation administration also flagged this but what they looked at was it was an attitude indicator. in other words, it tells you if your to put it simply if your