The goal of any engine control system is to allow the engine to perform at editorial design digital and print pdf efficiency for a given condition. Originally, engine control systems consisted of simple mechanical linkages connected physically to the engine. By moving these levers the pilot or the flight engineer could control fuel flow, power output, and many other engine parameters.
Analog electronic control varies an electrical signal to communicate the desired engine settings. The system was an evident improvement over mechanical control but had its drawbacks, including common electronic noise interference and reliability issues. However, the more critical inlet control was digital on the production aircraft. Following analog electronic control, the next step was to digital electronic control systems.
True full authority digital engine controls have no form of manual override available, placing full authority over the operating parameters of the engine in the hands of the computer. If a total FADEC failure occurs, the engine fails. An EEC, though a component of a FADEC, is not by itself FADEC. When standing alone, the EEC makes all of the decisions until the pilot wishes to intervene. The inputs are received by the EEC and analyzed up to 70 times per second. FADEC also controls engine starting and restarting.
The FADEC’s basic purpose is to provide optimum engine efficiency for a given flight condition. FADEC not only provides for efficient engine operation, it also allows the manufacturer to program engine limitations and receive engine health and maintenance reports. For example, to avoid exceeding a certain engine temperature, the FADEC can be programmed to automatically take the necessary measures without pilot intervention. With the operation of the engines so heavily relying on automation, safety is a great concern. Each channel may provide all engine functions without restriction. Engine control problems simultaneously causing loss of thrust on up to three engines have been cited as causal in the crash of an Airbus A400M aircraft at Seville Spain on 9 May 2015.
Airbus Chief Strategy Officer Marwan Lahoud confirmed on 29 May that incorrectly installed engine control software caused the fatal crash. There are no structural defects , but we have a serious quality problem in the final assembly. A typical civilian transport aircraft flight may illustrate the function of a FADEC. The FMS uses this data to calculate power settings for different phases of the flight.