United States Air Force Lockheed U-2 aircraft are assigned to Strategic Air Command's 4080th Strategic Reconnaissance Wing for filter duct calibration flight testing. A man pulls a dolly loaded with the filter hatch of a Lockheed U-2 aircraft out of a hangar at Edwards Air Force Base in California, United States. He checks the filter seal pressure for leaks and traces the filter route. He opens up a hatch and does more checking. He manually operates a butterfly gate in a duct opening. Close view of the butterfly gate opening and closing alternately in the duct opening.
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