Is the rudder boost system operational with the bleed air switch set to ENVIR OFF?

The rudder boost system is designed to enhance aircraft control, especially during critical phases of flight. When the bleed air switch is set to ENVIR OFF, it typically means that the environmental control systems, which may use bleed air for various functions, are not in operation. However, the rudder boost system is independent of these environmental systems and is designed to continue functioning properly even when the bleed air is turned off.

This operational characteristic is critical for ensuring that pilots maintain effective control of the aircraft, particularly in situations where environmental control systems are not necessary for flight safety. Hence, the rudder boost system remains operational regardless of the state of the bleed air switch, allowing for consistent handling characteristics of the aircraft. Other options suggest that the system would either be inoperative or unreliable under certain conditions, which does not accurately reflect how the rudder boost system is designed to function.