For example, B738 landing distance is developed by flight test using MAX MANUAL BRAKING, SPEED BRAKES UP, DRY RUNWAY and AGGRESSIVE TOUCH DOWN TECH. No thrust reverse is used or certified in the flight test demonstrated landing and takeoff distance. During Landing, auto speed brakes operate when A/C is on ground, speedbrake lever is in ARM and thrust levers are idle. However, during RTO, auto speed brakes operate when A/C is on ground, wheel speed is more than 60kt and thrust reverser levers are moved.