1.   But the subsequent discovery that ValuJet was not properly supervising its maintenance contractors forced the FAA to ground the airline.

2.   DeBruce founder and chief executive Paul DeBruce is careful not to level blame directly at its maintenance contractor.

3.   He also warned that it would be difficult to find another maintenance contractor if SR Technics fails.

4.   He said workers for a maintenance contractor had improperly installed a propeller blade on the plane.

5.   It is unknown whether the valve was opened by a worker for Phillips or for a maintenance contractor, Fish Engineering and Construction.

6.   Once discharged, the generators are mildly toxic and are considered as hazardous waste, a classification that gives maintenance contractors an incentive to return them to the airlines.

7.   The airline also reduced the number of outside maintenance contractors servicing its aircraft to comply with the FAA consent order.

8.   The airline also sharply reduced the number of outside maintenance contractors servicing its aircraft to comply with the FAA consent order.

9.   The company that packed the oxygen generators, Sabretech, a maintenance contractor, had objected vehemently to showing the videotape.

10.   The FAA, in a flurry of investigative actions, says it will scrutinize both the airline and its maintenance contractors.