Ed Jeffko left Tonasket on Monday and was heading for Sequim to pick up a family member. However, family members called for help when Jeffko didn't arrive as scheduled.
Searchers from the state Department of Transportation, the Civil Air Patrol and Washington Air Search and Rescue set up a search base at the Wenatchee Airport. Douglas County emergency officials are supporting aviation crews in Wenatchee.
WSDOT says four planes flew routes for six hours Monday night, starting in Sequim and heading to the Tonasket area, flying late into the night. Planes went up again early Tuesday and are continuing their to search routes the pilot may have taken.
While weather conditions were clear in Eastern Washington on Monday, there was a solid cloud cover in the Cascades. The DOT says clearer skies Tuesday will help in search efforts.
Officials have not located a flight plan or the plane's emergency beacon.