PLT236: Forces Acting on Aircraft
What code PLT236 covers, why the FAA tests it, and how to study Forces Acting on Aircraft before your checkride.
Recall forces acting on aircraft - airfoil / center of pressure / mean camber line
What this means for your checkride
This covers the geometry of an airfoil: the mean camber line that runs halfway between the upper and lower surfaces, and the center of pressure where the total aerodynamic force acts. As angle of attack changes, the center of pressure moves, which affects the airplane's pitching behavior.
The location and movement of the center of pressure explain stability and control, so the FAA tests whether you can connect airfoil shape to the forces it produces.
Pilots treat the center of pressure as fixed. It shifts forward as angle of attack increases and moves aft as it decreases, and that movement is part of why airplanes are designed the way they are.
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.