1.   Barbara Foli Lake said she never believed the official Navy account that the sinking was because of an unknown mechanical malfunction.

2.   Boeing maintains that replacing those units does not mean they had mechanical malfunctions.

3.   For decades, the Navy has said the Scorpion sank because of a mechanical malfunction while returning from the Mediterranean to its home port of Norfolk, Va.

4.   Fuel contamination can cause mechanical malfunctions, and is one of the first things investigators look at, Iden said.

5.   He attributed the accident to a mechanical malfunction in the truck.

6.   If not, it could support the theory that mechanical malfunction sparked and explosion in the fuel tank and caused the crash.

7.   In the absence of evidence pointing to a bomb or a missile, investigators with the National Transportation Safety Board have become more focused on a mechanical malfunction.

8.   Investigators say they believe the signal system worked properly, and they have found no evidence of any other mechanical malfunction, sharpening the focus on DeCurtis.

9.   Investigators want to know if a fuel tank explosion caused by a mechanical malfunction could have created enough force to split the plane in two.

10.   It failed because of a mechanical malfunction but blazed the trail for the Hubble Space Telescope.