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During a rapid deceleration the risk is

  • A.Shaft overspeed
  • B.Weak extinction of the combustor
  • C.Compressor surge from excessive pressure ratio
  • D.Turbine overtemperature

Answer: B

Cutting fuel faster than the shaft decelerates leaves the chamber below its weak extinction limit. The fuel control schedules deceleration for the same reason it schedules acceleration, protecting the engine at both ends of the range.

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