This aerospace document establishes the requirements for aircraft hydraulic accumulators with piston type separators for use in aircraft hydraulic systems at rated pressures ranging up to 8000 per square inch (psi) (55 160 KPa), including details pertinent to the design, fabrication, and performance of the accumulator. The temperature range of the accumulator is -65 degrees F (-54 degrees C) to 275 degrees F (+135 degrees C) or as specified by the procurement specification.