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AI.II.B.K1FAA-S-ACS-25 · Nov 2023Knowledge

Environmental conditions that degrade vision.

ACS element text (the applicant demonstrates understanding of)

Environmental conditions that degrade vision.

Bottom line

In flight, vision is influenced by atmospheric conditions, glare, lighting, windshield deterioration and distortion, aircraft design, cabin temperature, oxygen supply (particularly at night), and acceleration forces.

Key numbers

Key numbers for Environmental conditions that degrade vision.
NumberWhat it means
5 statute milesVFR visibility

FAA references

  1. AC 90-48, paras. 8.1.1, 8.1.9, 8.1.10 — AC No: 90-48E
  2. AIH ch. 10 (p. 10-7) — FAA-H-8083-9B
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