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High-energy ignition unit (HEIU)

High-energy ignition unit (HEIU)

  • High-energy ignition is required for starting gas turbine engines; a dual system is normally installed for the main engines.
  • The system comprises two HEIUs and two igniter plugs per engine. A typical HEIU installed on an engine.
  • Turbine ignition systems are switched off after the engine has reached self-sustaining speed; the system is used as a precaution during certain flight conditions e.g. icing, rain, or snow.
  • In-flight start uses the wind-milling effect of the engine within the specific ed flight envelope of airspeed and altitude.
  • High voltages are required for the igniter plugs to accommodate the variations in atomized fuel over the range of atmospheric.


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