This specification establishes the common requirements and provides a guide for special requirements for variable delivery hydraulic pumps@ suitable for use in civil aircraft. It also specifies the methods to be used for demonstrating compliance with these requirements. Model Specification ?C A pump Model Specification@ conforming to Appendix I of this specification@ shall be prepared for each distinct pump model by either the purchaser who intends to purchase and install that model or the pump manufacturer@ and shall be submitted to the purchaser for approval.