Three special carts equipped with Hilman Rollers, one under each landing gear, provided the solution. The nose wheel cart is equipped with (4) 20-NT style rollers and a flanged wheel that runs on rail and provides precise unidirectional steering. Each of the other two carts are equipped with (5) 20-NT style rollers.
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With only 6" of clearance, the normal method of towing could not be used to move Boeing 737 aircraft in and out of the paint hanger.