1.   Incidents noted by the FAA included cases where planes were released for service with missing bolts, leaking fuel tanks and other incomplete or improper repairs.

2.   On Thursday, Frank Hildrup, an NTSB crash investigator, said the crash was probably caused by a missing bolt from the control system.

3.   On Thursday, Frank Hildrup, an NTSB crash investigator, said the accident was probably caused by a missing bolt from the control system.

4.   The guillotine has arrived, but Gavin Sadler is concerned about the missing bolt.

5.   But the missing bolts were particularly troubling.

6.   The committee was told by the NTSB in an unofficial report that the missing bolt was found at the facility, Kyodo quoted the sources as saying.