<div class="section abstract"> <div class="htmlview paragraph">This SAE Aerospace Recommended Practice (ARP) provides guidance on the engine performance parameters that may be selected by airframe and engine manufacturers, and used by a pilot or operator, to monitor the thermodynamic health of a turboshaft engine installed in a rotorcraft and the measurement system accuracies desired. Different accuracies may be required for in-flight operations such as engine control.</div></div>