PLT129: Runway Slope
What code PLT129 covers, why the FAA tests it, and how to study Runway Slope before your checkride.
Recall aircraft performance - effects of runway slope / slope landing 4
What this means for your checkride
Runway slope, or gradient, affects takeoff and landing distance. An upslope lengthens the takeoff roll because gravity opposes acceleration but shortens the landing; a downslope shortens the takeoff but lengthens the landing. Combined with wind the two can conflict, and the field data give the gradient.
Slope can add meaningful distance at a short or mountain strip, so the FAA tests how upslope and downslope change takeoff and landing performance.
Pilots always take off downhill and land uphill. Wind usually outweighs slope, so a strong headwind can make the opposite choice correct; you weigh slope against wind, not slope alone.
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.