This SAE Aerospace Recommended Practice (ARP) is intended as a guide in defining the requirements for aerospace piston separated hydraulic accumulators@ including details pertinent to the design@ fabrication@ and performance of the accumulator. This type of accumulator has a piston separator and contains both high-pressure gas and fluid. The accumulator is used in aerospace hydraulic systems of the following types as defined in AS5440 with design operating pressures of up to 8000 psi (55@160 kPa). ?Type I: -65 to +160 ??(-54 to +71 ?? fluid temperature ? Type II: -65 to +275 ??(-54 to +135 ?? fluid temperature For commercial aerospace or helicopter applications@ the information and guidelines of ARP4752 or ARP4925 respectively@ are considered.