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CA.VI.A.K2FAA-S-ACS-7B · Nov 2023Knowledge

Magnetic compass errors.

ACS element text (the applicant demonstrates understanding of)

Magnetic compass errors.

Bottom line

Turning error shows up only on turns to or from northerly headings in the Northern Hemisphere and southerly headings in the Southern Hemisphere.

Key numbers

Key numbers for Magnetic compass errors.
NumberWhat it means
Stop a northerly turn 15 degrees plus half of the latitude (rule of thumb)Lead rule
Compass card rotates toward South when decelerating on an easterly or westerly headingDeceleration

FAA references

  1. AFH Glossary (p. G-16) — FAA-H-8083-3C
  2. PHAK ch. 8 (pp. 8-25–8-26) — FAA-H-8083-25C (2023)
  3. PHAK Glossary (p. G-9) — FAA-H-8083-25C (2023)
  4. PHAK ch. 0 (p. 0-400) — FAA-H-8083-25C (2023)
  5. AFH ch. 3 (p. 3-8) — FAA-H-8083-3C
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