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SAE AIR5924B

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This SAE Aerospace Information Report (AIR) provides methodologies and approaches that have been used to install and integrate full-authority-digital-engine-control (FADEC) systems on transport category aircraft. Although most of the information provided is based on turbofan/turboprop engines installed on large commercial transports, many of the issues raised are equally applicable to corporate, general aviation, regional, and commuter aircraft, and to military installations, particularly when commercial aircraft are employed by military users. The word “engine” is used to designate the aircraft propulsion system. The engine station designations used in this report are shown in Figures 1 to 3. Most of the material concerns an electronic engine control (EEC) with its associated software and its functional integration with the aircraft. However, the report also addresses the physical environment associated with the EEC and its associated wiring and sensors. Since most current transport category engines use dual-channel FADEC systems, this is the configuration addressed by this report. A typical FADEC system configuration is shown in Figure 4. Purpose This report provides guidance to engine/control designers and aircraft system designers for issues associated with the installation and integration of engine control systems with aircraft systems. Future technologies employed may be different from those addressed in this report, but the basic concepts are the same. The readers must judge the importance of the concepts being addressed to the technology that they are employing in a new application. The examples used have satisfied the requirements in existence at the time of design/certification; they are not considered requirements. Summary of Revision B This revision provides updated information on the integration of FADEC systems based on the most recent practices in the industry and interactions with certification authorities. The main topics that were updated on this revision are: backup mode for steady state control operation, automatic power reserve (APR) or automatic takeoff thrust control system (ATTCS), uncontrollable high thrust (UHT) accommodation, powerplant functions not related to engine control, use of aircraft signals, flight crew interface, and EEC channel reset and transfer. This revision also adds information on the FADEC system integration with turboprop aircraft. Field of Application The field of application is aerospace, primarily for FADEC-equipped engines targeted for commercial transport and general aviation aircraft installations.

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