A VASI (Visual Approach Slope Indicator) beside a runway shows red over white. What does this tell a pilot about the aircraft's position relative to the glide path?

Why →A two-bar VASI shows the aircraft is on the correct glide path when the near bar reads white and the far bar reads red, producing red over white. Two reds means too low, and two whites means too high. A remote pilot operating near an airport is not flying an approach, but the Part 107 test expects familiarity with the visual glide slope aids that manned traffic relies on.

The trap →The memory aid is "red over white, you're alright." "Red over red, you're dead" signals too low, and two whites means too high. Reversing the color stack leads to picking too high or too low.

Field note →VASI guidance keeps manned traffic on a stable descent to the runway. Knowing what the lights mean helps a remote pilot recognize where aircraft sit on final and stay well clear of the approach corridor.