PLT025: Bernoulli's Principle
What code PLT025 covers, why the FAA tests it, and how to study Bernoulli's Principle before your checkride.
Define Bernoulli’s principle
What this means for your checkride
Bernoulli's principle states that as the speed of a fluid increases, its pressure decreases. Over a wing, the differences in airflow speed and pressure, together with Newton's third law, produce the pressure difference that makes lift.
It is part of the standard explanation of lift, so the FAA tests whether you can state the principle and connect faster airflow to lower pressure over the wing.
The equal-transit-time myth says air must rejoin at the trailing edge. Lift comes from the pressure difference the airfoil and angle of attack create, described by both Bernoulli and Newton, not any equal-time rule.
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.