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Altitude relight capability describes the ability to

  • A.Ignite the chamber on the ground at any temperature
  • B.Maintain combustion at maximum power
  • C.Light the afterburner at altitude
  • D.Restart the engine in flight after a flameout

Answer: D

Correct answer: Restart the engine in flight after a flameout

Altitude relight is the ability to relight the main combustor in flight, where the air is thin and cold and the fuel does not vaporise readily. It is a certification requirement, demonstrated over an envelope of altitude and airspeed, and it is one of the constraints that keeps a combustor from being optimised purely for cruise efficiency.

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