Originally Posted by Glenntilton

It is not pressure breathing which is required at high altitudes. So many people will be unconscious but they will survive with the oxygen being provided

Originally Posted by Colganguy

Hey Doc,
A more serious question to ask is why do the lavs drop 2 masks.

Originally Posted by Flying MD

One serious problem with the passenger mask system, as mentioned by an earlier writer in this thread, is that you do have to pull down on the tubing, apparently to move a pin in the canister, to begin the reaction and to get oxygen flowing.

Originally Posted by Semaphore Sam

I believe all O2 generators/masks have been removed from the lavs, I think per TSA orders, or am I wrong? Sam

Originally Posted by Flying MD

One serious problem with the passenger mask system, as mentioned by an earlier writer in this thread, is that you do have to pull down on the tubing, apparently to move a pin in the canister, to begin the reaction and to get oxygen flowing. Even though the flight attendants always say this, I did not understand the importance of this maneuver until I looked at the system. I think that most passengers would assume that the oxygen is from a tank where this action would be unimportant. A recent NPR quiz show asked panelists about the common things done on a commercial airplane, and when asked about oxygen masks, the "Pull on the tubing to initiate the flow of oxygen" was not mentioned. I would think that the flight attendants should be instructed to say that "Oxygen will not begin to flow until you pull firmly on the tubing" rather than using their current script.