21.   A Navy official said over the weekend that the Navy knew of no safety problems caused by the faulty bearings.

22.   A recent probe by the Federal Railroad Administration found myriad safety problems on the railroad.

23.   A study of the industry by the Union of Concerned Scientists found that five plants were shut down for more than a year to fix safety problems.

24.   A plane crashes and the public learns that even before the accident the Federal Aviation Administration had been concerned about safety problems at the airline.

25.   A special committee has studied this and other safety problems for two years and is expected to recommend replacement of this glass with a type that has more flexibility.

26.   AirTran Airlines, the airline formerly known as ValuJet, rejected a report that federal inspectors found new safety problems during a routine check.

27.   All four of its Connecticut nuclear plants were shut down last year for safety problems.

28.   Airlines have also asserted that there were no safety problems.

29.   AirTran Airlines on Monday rebutted accounts of new safety problems at the carrier, hoping to minimize the damage to its comeback effort.

30.   Already, safety problems are on the rise across the region as reactor owners prepare for the age of competition.