ARP1217B Instrumentation Requirements for Turboshaft Engine Performance Measurements

During the SAE Five-Year Review, it was identified that although ARP1217A’s scope states that it provides “the measurement parameters that may be used by a pilot or operator to monitor the thermodynamic health of a turboshaft engine,” the actual content seemed more oriented on providing guidance to the airframe or engine manufacturers for the selection of the parameters and instrumentation and for which the pilot or operator would have little to no impact as the product end user. In addition, it was found that relevant reference documents providing complementary information were not referenced in ARP1217A. Finally, instrumentation accuracy/uncertainty being something that evolves through the years, a thorough review was deemed required to make sure that ARP1217 is aligned with the current state/understanding of the respective technologies.