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The latest tubing, fitting, and flexible line designs as well as the testing techniques presently used on production airplane hydraulic distribution systems are reviewed in this paper. Designs and materials that are being considered for future airplanes as well as their advantages are presented here in terms of weight and cost. Other major trade parameters such as reliability and maintainability are also considered along with the most significant of all distribution system areas requiring improvement-the installation criteria and techniques. Advanced tensile, impulse, and flexure testing techniques are evaluated and compared with actual airplane combined load environments encountered by hydraulic systems on large jet aircraft.