PLT351: Propeller System
What code PLT351 covers, why the FAA tests it, and how to study Propeller System before your checkride.
Recall propeller system - types / components / operating principles / characteristics
What this means for your checkride
The propeller converts engine power into thrust. A fixed-pitch propeller has one blade angle set for a compromise of climb and cruise; a constant-speed propeller lets the pilot select an RPM and a governor adjusts blade angle to hold it, keeping the engine efficient across climb, cruise, and descent.
Propeller type changes how you set power and read the instruments, so the FAA tests the difference between fixed-pitch and constant-speed systems and how the governor manages blade angle.
With a constant-speed propeller, pilots think the tachometer alone shows power. You set manifold pressure and RPM together, and a common error is a large power change made in the wrong order rather than adjusting smoothly.
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.