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Fadec and hums
 

Fadec and hums

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Prepared this presentation for one of the courses I took at ERAU WWOnline

Prepared this presentation for one of the courses I took at ERAU WWOnline

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    Fadec and hums Fadec and hums Presentation Transcript

    • FADEC and HUMS Full Authority Digital Engine Control And Helicopter Utilization Management System Issue 8, Melke
    • Topics
      • History
      • Configuration
      • Advantages
      • Requirements
      • References
      Issue 8, Melke
    • FADEC History
      • Early aircraft engines only required simple gate valves to control fuel flow as they had no adverse power requirements.
      • Three dimensional cams, springs, bellows, fly weights were mechanisms that were used in output control of engine’s of the 1950s (Scoles, 1986)
      • Supersonic flight initiated engine air inlet temperature rise which needed engine fuel control for such situations
      • High speed low altitude operations also caused stalling speeds in jet engines and thus required appropriate engine fuel and speed control
      • As aircraft performance requirements varied engines were required to deliver out put appropriate for the operation
      Issue 8, Melke
    • FADEC History
      • Computer technology was growing in parallel to the changes in engine control requirements.
      • The ability of computers to process more control signal as compared to mechanical gadgets was noticed by engine manufacturers.
      • Eventually to harness the computing capability and produce engines that have effective out put for various aircraft performance demands, engine manufacturers moved to electronic engine controls.
      Issue 8, Melke
    • FADEC Configuration
      • FADEC system has a central computer commonly referred to as Electronic Engine Control (EEC).
      • Wiring to the EEC from the various engine positions relay real-time data for the EEC to compute.
      • Wiring from the aircraft to the EEC relay aircraft demand.
      • Wiring from the EEC to the engine relay control signals to operate the engine.
      • Some versions of the EEC like the ones installed on commercial aircrafts receive actual physical data like air pressure through plumbing lines while making their computation.
      Issue 8, Melke
    • FADEC Advantages
      • FADEC system allows consistent and repeatable engine performance regardless of fuel type,temperature or engine condition (Scoles, 1986).
      • FADEC system has built in test indicators that reduce maintenance time
      • It reduces cost by increasing engine life, reducing the number of flight tests and lowering maintenance and spares cost.
      • As pilots have decreased number of engine control levers due to FADEC system, their work in controlling the aircraft will be more focused.
      Issue 8, Melke
    • HUMS History
      • Concerns in the Unites States Navy for engine performance on aircraft such as the A7 and the United States Air Force F100 engines installed on F15 and F16 initiated engine vibration and performance monitoring (Land, 2001).
      • This technology was applied on helicopters only after an accident took place in the North Sea that claimed 50 lives (Land, 2001).
      • Consequently an authority referred to as the Helicopter Advisory Review Panel (HARP) was established which required the research and development of condition monitoring devices or systems.
      • As a result the first of operational HUMS went into service in the North Sea commercial arena in 1991
      Issue 8, Melke
    • HUMS Configuration
      • HUMS includes avionics equipment on board the rotorcraft and an associated ground equipment to retrieve real time data.
      • It assess health by examining instantaneous indicators of the well being of vital components of the aircraft as well as trend analysis of these indicators
      • Usage is measured by determining the time to overhaul of some components of the rotorcraft such as the gearboxes
      Issue 8, Melke
    • HUMS Advantages
      • Implementing HUMS has direct and indirect advantages some of which are (Land, 2001);
      • Direct Advantages:
      • Dispatch Reliability increase
      • Improved service life
      • Improved operations and maintenance planning
      • Indirect advantages:
      • Reduced crew fatigue
      • Improved safety
      • Improved customer confidence
      Issue 8, Melke
    • HUMS Requirements
      • HUMS needs to be understood as a system of machines, equipment, people and processes (Land, 2001).
      • It impacts flight crew, ground crew, spares supply chain, store room, aircraft manufacturers, regulators and insurers.
      • It requires a proactive approach of helicopter maintenance to function effectively.
      • In order to get the best out of HUMS, all concerned must be able to do their portion of availing a healthy and efficiently utilized rotorcraft.
      Issue 8, Melke
    • References
      • Land, J.E.(2001, March). HUMS – The Benefits – Past, Present and Future. Paper presented at the 2001 IEEE Aerospace Conference Proceedings, Big Sky,Mo.
      • Scoles, R.J. (1986, October). FADEC – Every Jet Engine Should Have One. Paper presented on Society of Automotive Engineers’ Aerospace Technology Conference and Exposition, Long Beach, Ca.