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Air-driven gyros are spun by

  • A.An electric motor within the rotor
  • B.The aircraft's ram airflow directly
  • C.Exhaust gas from the engine
  • D.Air drawn across the rotor buckets

Answer: D

A vacuum pump draws air through a filter and across the rotor buckets. The arrangement fails silently as the filter clogs or the pump wears, and the resulting slow spin-down produces an increasingly untrustworthy indication rather than an obvious failure.

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