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A common argument for electrically driven gyros over air-driven ones is that they

  • A.They work at high altitude
  • B.Require no power source
  • C.Are immune to precession
  • D.Need no erection system

Answer: A

Vacuum systems lose effectiveness as air density falls, which limits them at altitude. Splitting the instruments between air and electrical drive is also a deliberate redundancy measure so that one failure does not remove every attitude reference.

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