What is the purpose of the foot pedals in a helicopter cockpit?

The foot pedals in a helicopter cockpit are primarily used to control the torque effect produced by the main rotor system. When a helicopter's rotor blades spin, they generate torque in the opposite direction, which can cause the helicopter’s body to rotate. The foot pedals are linked to the anti-torque tail rotor, which counteracts this effect, allowing the pilot to maintain directional control.

By pressing the pedals, the pilot can adjust the thrust of the tail rotor, compensating for the torque generated by the main rotor and ensuring that the helicopter remains stable and can maneuver effectively. This is crucial for maintaining control during flight, especially during hover or when making turns.

Other functions highlighted in the options, such as controlling altitude or managing fuel consumption, are performed using different controls in the cockpit, such as the cyclic and collective controls. Instrument navigation also relies on various displays and controls, not the foot pedals. Thus, controlling the torque effect is the primary and essential function of the foot pedals in a helicopter cockpit.