PLT301: Inversion Layer
What code PLT301 covers, why the FAA tests it, and how to study Inversion Layer before your checkride.
Recall inversion layer - characteristics
What this means for your checkride
A temperature inversion is a layer where temperature rises with height instead of falling. It caps the air below it, trapping moisture and pollutants, and often brings smooth but hazy air, poor visibility, and sometimes low-level wind shear at its top.
Inversions affect visibility, stability, and wind shear, so the FAA tests how they form and the conditions they create.
Pilots expect turbulence in an inversion. The trapped air is usually smooth; the hazards are reduced visibility and possible shear at the inversion top.
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.