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PA.I.C.K3aFAA-S-ACS-6C · Nov 2023Knowledge

a. Atmospheric composition and stability

ACS element text (the applicant demonstrates understanding of)

Meteorology applicable to the departure, en route, alternate, and destination under visual flight rules (VFR) in Visual Meteorological Conditions (VMC), including expected climate and hazardous conditions such as: a. Atmospheric composition and stability

Bottom line

Stability describes how air responds to vertical displacement.

FAA references

  1. PHAK ch. 12, Weather Theory — FAA-H-8083-25C (2023)
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