Fadec

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define FADEC

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FULL AUTHORITY DIGITAL ELECTRONICS CONTROL not
FULL AUTHORITY DIGITAL ENGINE CONTROL

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FADEC system consist of:

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DIGITAL COMPUTER called EEC or ECU and its related accessories which control all aspect of engine performance.

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EEC

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ELECTRONIC ENGINE CONTROL

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ECU

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ELECTRONIC CONTROL UNIT

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The aircraft's thrust lever sends electrical signals (pilot's command) to

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FADEC

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FADEC digitally calculates and precisely controls the..

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fuel flow rate to the engines giving precise thrust

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VSV

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VARIABLE STATOR VANES

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VBV

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VARIABLE BLEED VALVES

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FADEC monitors:

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VSV, VBV, cabin bleeds, power-off takes control, engine health monitoring, oil debris monitoring, vibration monitoring

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FADEC Advantages

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better fuel efficiency, automatic engine protection against out of tolerance operations, multiple channel FADEC computer provides redundancy, care free engine handling, guaranteed thrust settings, semi auto engine starting

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ADVANTAGES

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better fuel efficiency
automatic engine protection against out-of-tolerance operations
safer as the multiple channel FADEC computer provides redundancy in case of failure
care-free engine handling, with guaranteed thrust settings
ability to use single engine type for wide thrust requirements by just reprogramming the FADECs
provides semi-automatic engine starting
better systems integration with engine and aircraft systems
can provide engine long-term health monitoring and diagnostics
the number of external and internal parameters used in the control processes increases by one order of magnitude
reduces the number of parameters to be monitored by flight crews
due to the high number of parameters monitored, the FADEC makes possible "Fault Tolerant Systems" (where a system can operate within required reliability and safety limitation with certain fault configurations)
the FADEC can support automatic aircraft and engine emergency responses (e.g. in case of aircraft stall, engines increase thrust automatically).

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Disadvantages

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the engineering processes used to design, manufacture, install and maintain the sensors which measure and report flight and engine parameters to the control system itself
the integrity and reliability of the materials and the path over which this data flows
the software engineering processes used in the design, implementation and testing of the software used in these safety-critical control systems. This led to the development and use of specialized software such as SCADE.
the ability of the display subsystem to provide clear and unambiguous information to the crew, under conditions of high stress and intensive cockpit workload (for example, in an emergency)
the responsiveness of both the FADEC software and its acceptance of "human input" under dangerous flight envelopes, for instance at low airspeed, close to terrain, high all-up-weight, low fuel state, unusual airframe attitude, other systems reporting "anomalous behaviour" (typically, after combat damage or other component failure)
the completeness of the flight simulations and parameters used to populate the rulebase against which some FADEC systems compare for "valid" control inputs in prevailing flight conditions.

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FADEC (Full Authority Digital Engine Control)

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The FADEC system is a fully redundant 32-bit motor management system for the CENTURION 1.7 which includes safety appliances. The hardware and the software of the FADEC was completely developed on our own. We adhire strictly to the international aviation standards (JAR, FAA). The certified FADEC passed difficult test criteria of the EMV. The ECU regulates the high-pressure valves, the common rail pressure, the turbo charger and the constant speed propeller's pitch. Furthermore the FADEC contains some more special functions like the electronic event logging which safes diagnostic data, sensorial monitoring, diacnostic interface, the integrated run-up check or the continous surveillance of more than 30 internal and external engine parameter.