SAE ARP1507B

This SAE Aerospace Recommended Practice (ARP) provides a guide for the preparation of a helicopter engine/airframe interface document and checklist. This document and checklist should identify the information needed by the engine manufacturer and the aircraft manufacturer to integrate the engine design with the aircraft design and either provide this information or give reference to where this information is located. The intent is to assure that the engine manufacturer and the airframe manufacturer identify and make provision for this information so it can be easily accessible to either manufacturer as needed in the development stages of an engine-airframe integration project. A related document, SAE Aerospace Information Report AIR6181, provides guidance on creating an interface control document (ICD) which addresses a subset of the aircraft-engine interface information concerning the physical and functional interfaces of the electronic engine control system (EECS) with the aircraft systems. This would include signal interfaces, digital data busses and integrated functionality with the aircraft electronic systems and avionics displays. The engine/airframe interface document should reference this EECS ICD rather than duplicate its information. Similarly, as information is documented in the engine installation manual or engine installation drawings, the engine/airframe interface document should make references to the engine installation manual or engine installation drawings, rather than duplicate the information. Typically, the engine/airframe interface document will be the initial document in the project to capture the interface information which can then transition to referenced information as the engine installation manual, EECS ICD, and engine installation drawings are developed. During the SAE Five-Year Review, it was identified that although the scope of ARP1507A stated that it provided “complete relevant information” on engine-airframe interfaces, it primarily covered mechanical interfaces and not electronic interfaces. The integration of the engine electronic systems with aircraft electronic systems has greatly expanded in the industry since last update of this document in 1997. Another SAE E-36 document, AIR6181, covers most of the needed information on electronic engine-aircraft interface. Rather than redundantly add this information to ARP1507, a reference to AIR6181 has been added in ARP1507 to point to the electronic interface information that it covers. Secondarily, there are additional mechanical interface considerations that have been added to ARP1507 document text and checklist.