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PA.VIII.B.K1aFAA-S-ACS-6C · Nov 2023Knowledge

a. Instrument limitations and potential errors

ACS element text (the applicant demonstrates understanding of)

Flight instruments as they relate to: a. Instrument limitations and potential errors

Bottom line

The pitot-static system uses static air pressure and dynamic pressure to operate the airspeed indicator, altimeter, and vertical speed indicator.

Key numbers

Key numbers for a. Instrument limitations and potential errors
NumberWhat it means
29.92 inches of mercury internal pressure of each sealed aneroid wafer in the altimeterAneroid vacuum
100 knots when the airplane is heavily loadedVA heavy
90 knots when the load is lightVA light

FAA references

  1. PHAK ch. 8 (p. 8-1) — FAA-H-8083-25C (2023)
  2. PHAK ch. 8 (p. 8-3) — FAA-H-8083-25C (2023)
  3. PHAK ch. 8 (pp. 8-9–8-10) — FAA-H-8083-25C (2023)
  4. AFH ch. 9 (p. 9-13) — FAA-H-8083-3C
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