The captain stated that while taxiing southbound on taxiway "Z," the flight crew felt a sudden "big thud/ jolt." After an inspection of the outside of the airplane, the captain observed damage to the left main wingtip due to a possible collision with a construction steamroller. The steamroller driver stated that after lunch he returned to the construction site and began to operate the steamroller without a wing walker being present. He said that he did not see or hear the airplane as it approached.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:

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