In order to decrease power, the operator throttles shut turbine inlet valves. Since the throttles are at idle this will modulate the speed. Primary controls are the joystick and a pair of throttles. The flight control computer also controls the aircraft throttles to maintain the appropriate approach speed. After the side boosters separate, the center core throttles back up to maximum thrust. The most rudimentary level, L1 focuses on minor repairs of brakes, tires, and throttles. The FDR showed the throttles were advanced from idle at that time. Many diesel engines do not have butterfly valve throttles. Controllers ("throttles") vary car speed by modulating the voltage from the power pack. Banking and pushing throttles full on, they accelerated. The primary flight controls are a force-sensitive side-stick controller and a pair of throttles. Like motorcycles, Morgans had hand throttles, Bowden-wire control mechanisms, and drip lubrication. At touchdown, the pilot advances the throttles to full power. Hani Hanjour advanced the throttles to maximum power and dived toward the Pentagon. The wrestler grabs his opponent's throat with both hands and throttles him.