Such thin air would leave even an oxygen generator gasping for breath.

Investigators said it had been caused by oxygen generators aboard the flight.

Safety board investigators asked many questions today aimed at determining why the oxygen generators were a subject of such confusion.

And the quickest way to achieve that would be to destroy the oxygen generators.

Investigators for the safety board said the jetliner had carried 50 to 60 of the oxygen generators.

That fire, touched off by an oxygen generator, burned intensely for several minutes.

Among the parts needing service were the oxygen generators installed over each group of seats.

I cleaned it out, changed the charcoal filters, and stepped up the oxygen generator, the work taking about three hours.

The devices, oxygen generators, are believed to have set off the the fire.

They also repaired and replaced the oxygen generators in Mir.