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AhaBulb: Stuff Everyone Should Know · ahabulb.com/ifr-vacuum-failure

A vacuum pump fails in an airplane with vacuum-driven gyros. Which instruments become unreliable?

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  1. The attitude indicator and heading indicator
  2. The airspeed indicator and altimeter
  3. The vertical speed indicator and magnetic compass

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References

  1. FAA Instrument Flying Handbook (FAA-H-8083-15B) www.faa.gov/sites/faa.gov/files/pilots/FAA-H-8083-15B.pdf Checked 2026-10-11.
  2. FAA Instrument Flying Handbook (FAA-H-8083-15B) www.faa.gov/sites/faa.gov/files/pilots/FAA-H-8083-15B.pdf Checked 2026-10-11.

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