The man was taken to Harborview Medical Center in Seattle with serious injuries after becoming trapped underneath the landing gear of a 787.
Paine Field and Snohomish County officials on Monday referred all questions to Boeing.
The accident also is being investigated by the state department of Labor & Industries.
An L&I investigation is common practice after someone is seriously injured in a workplace, spokeswoman Elaine Fischer said. The focus of the investigation is to determine what safety rules were in place and to ensure compliance.
A Boeing spokesman on Monday declined to discuss the case and would not say whether the man was expected to recover from his injuries.
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