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AA.VI.D.S5FAA-S-ACS-11A · Nov 2023Skills

Recognize if any flight instrumentation is inaccurate or inoperative, and take appropri...

ACS element text (the applicant demonstrates understanding of)

Recognize if any flight instrumentation is inaccurate or inoperative, and take appropriate action.

Bottom line

The GPS receiver verifies the integrity (usability) of the signals received from the GPS constellation through RAIM to determine if a satellite is providing corrupted information. In situations where the loss of RAIM capability is predicted to occur, the flight must rely on other approved equipment, delay departure, or cancel the flight.

FAA references

  1. IFH ch. 9 (p. 9-27) — FAA-H-8083-15B
  2. IFH ch. 9 (p. 9-31) — FAA-H-8083-15B
  3. RMH ch. 7 (p. 7-3) — FAA-H-8083-2A
  4. 14 CFR 91.175 (Takeoff and landing under IFR.) — eCFR current as of 2026-03-05
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