Original Message

I’m still leaning toward a jab event. At FL250 or there abouts  he  should have been able to get a quick doning oxygen mask on in plenty of time (3 or 4 seconds at most), if the tank was turned on. Some private operators may keep the tank valve turned off so it doesn’t leak down and they have to shell out for a refil. If you have to fumble around and get the valve on that could be a significant delay. Ask me how I know this. In the 121 world it stays on and if it drops down we call for a refil or we don’t go. Part 91 guys usually don’t tell the boss about items like that, they just complete the flight and hope nothing happens. Nobody knows for sure right now. It could have been a blown window or maybe a door unlatched.