Official Boeing photo P 33494. Original caption reads: "Sturdy jetliner tires are readied for replacement on this 727 after the airplane completed a phase of U. S. Federal Aviation Agency certification testing at Edwards Air Force Base, California. Wheels, tires and brakes were replaced before each new test to insure maximum performance..." First flown 4 October 1963, delivered to United 24 June 1964.
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