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IR.V.A.R3FAA-S-ACS-8C · Nov 2023Risk management

Limitations of the navigation system in use.

ACS element text (the applicant demonstrates understanding of)

Limitations of the navigation system in use.

Bottom line

Without RAIM capability, the pilot has no assurance of the accuracy of the GPS position. GPS derived altitude should not be relied upon to determine aircraft altitude since the vertical error can be quite large and no integrity is provided.

FAA references

  1. AFH ch. 5, Human Factors (p. 5-2) — FAA-H-8083-3C
  2. PHAK ch. 16 (p. 16-31) — FAA-H-8083-25C (2023)
  3. RMH ch. 7 (pp. 7-3–7-4) — FAA-H-8083-2A
  4. PHAK ch. 16 (p. 16-28) — FAA-H-8083-25C (2023)
  5. PHAK ch. 16 (p. 16-22) — FAA-H-8083-25C (2023)
  6. PHAK Glossary (p. G-25) — FAA-H-8083-25C (2023)
  7. IFH ch. 9 (p. 9-26) — FAA-H-8083-15B
  8. IFH ch. 11 (p. 11-12) — FAA-H-8083-15B
  9. IPH ch. 1 (p. 1-33) — FAA-H-8083-16B
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