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AI.II.M.R5FAA-S-ACS-25 · Nov 2023Risk management

Effect of visual illusions and night adaptation during all phases of night flying.

ACS element text (the applicant demonstrates understanding of)

Effect of visual illusions and night adaptation during all phases of night flying.

Bottom line

Above featureless terrain at night, there is a natural tendency to fly a lowerthan-normal approach. Flightdeck lighting should be kept as low as possible so that the light does not monopolize night vision.

FAA references

  1. PHAK ch. 17 (p. 17-23) — FAA-H-8083-25C (2023)
  2. PHAK ch. 17 (p. 17-27) — FAA-H-8083-25C (2023)
  3. PHAK ch. 17 (p. 17-24) — FAA-H-8083-25C (2023)
  4. AIM 8-1-2 (Effects of Altitude) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  5. PHAK ch. 17 (p. 17-26) — FAA-H-8083-25C (2023)
  6. AIM 8-1-6 (Vision in Flight) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  7. AIM 7-6-14 (Flying in Flat Light, Brown Out Conditions, and White Out Conditions) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  8. PHAK ch. 17 (pp. 17-9–17-10) — FAA-H-8083-25C (2023)
  9. AFH ch. 5, Human Factors (p. 5-3) — FAA-H-8083-3C
  10. RMH ch. 3 (p. 3-8) — FAA-H-8083-2A
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