SEATTLE - KING 5 news has learned that a small bit of loose metal, possibly a washer, caused the fire inside Boeing's second 787 test airplane 15 days ago over Texas. The fire occurred during the final minutes of a test flight.

The piece of metal was inside the P-100 electrical bay, located in the fuselage behind where the wing attaches on the left side of the aircraft. The metal came into contact with parts of the electrical system causing a short.

The fire set off a series of events which are now causing Boeing to pursue a relatively minor re-design of its 787 electrical system.

The company is expected to announce the findings of its investigation this afternoon.

The open question is just how much additional delay, if any, this will mean to Boeing's plan to deliver the first jet to Japan's All Nippon Airlines sometime in February of next year.

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