50 FTS Check Flight Smart Book Practice Test

Landing distance is influenced by weight and configuration. When flaps are not used, the airplane needs more runway, and heavier weight adds to that distance. The chosen expression models this by starting with a base distance (2500), adding the fuel weight (Gas), and then doubling the sum to reflect the stronger, roughly proportional increase in distance as weight goes up. After that, a fixed amount (Flare) is added to account for the distance consumed during the flare maneuver after touchdown. This combination matches the idea that weight increases landing distance, and without flaps you don’t reduce that distance—so you multiply the weight-adjusted base by two and then add the flare distance. The other options would imply subtracting fuel, using a different multiplier, or subtracting the flare, which don’t align with how weight and flare affect landing distance.