PLT226: Fog
What code PLT226 covers, why the FAA tests it, and how to study Fog before your checkride.
Recall fog - types / formation / resulting weather
What this means for your checkride
Fog is a surface-based cloud that forms when air near the ground cools to its dew point or picks up moisture. The main types (radiation, advection, upslope, steam, and precipitation-induced) each form under specific conditions and clear under different ones.
Fog is a leading cause of low-visibility accidents, so the FAA tests how each type forms and, just as important, when it will dissipate.
Candidates lump all fog together. Radiation fog burns off with daytime heating, but advection fog can persist as long as the moist air keeps flowing in.
Where to study it
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.