1.   The Department of Transportation classifies the oxygen generators as hazardous materials when carried as company material in cargo compartments.

2.   Also not affected by the ban are cylinders containing compressed oxygen and oxygen generators provided by air carriers to passengers for medical reasons.

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

4.   Among the questions to be asked in both inquiries are what instructions Valujet gave Sabretech about the oxygen generators, and what Sabretech told Valujet it had done.

5.   An oxygen generator failed the next month, leaving the crew with a two-month air supply.

6.   An oxygen generator failed.

7.   Another outstanding issue is who had final responsibility for determining that safety caps that would have prevented the oxygen generators from detonating had been installed.

8.   A damaged oxygen generator could allow heat to escape, while producing oxygen that could feed a fire.

9.   A fire broke out on board in February, and the main oxygen generator shut down in March.

10.   Aboard are new flex hoses that the cosmonauts will use to attempt repairs on the oxygen generator.