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SESK: Stuff Everyone Should Know · sesk.info/pilot-blocked-static-instruments

A blocked static port causes errors in which instruments besides the airspeed indicator?

The altimeter and VSI.

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  1. Tachometer and oil gauge
  2. Altimeter and VSI ✔
  3. Compass and turn coordinator

Why: The airspeed indicator, altimeter, and vertical speed indicator all use static pressure. Blocking the static source can corrupt all three indications.

Huh, didn't know that: Moisture, ice, dirt, or insects can block pitot-static openings.

The dad joke
The static port stayed quiet, and three instruments complained about the pressure.
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References

Answer: Altimeter and VSI. The airspeed indicator, altimeter, and vertical speed indicator all use static pressure. Blocking the static source can corrupt all three indications.

  1. Pilot's Handbook of Aeronautical Knowledge Chapter 8 www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/phak/10_phak_ch8.pdf
    A blockage of the static port not only affects the ASI, but also causes errors in the altimeter and VSI.
    Checked 2026-10-09.

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