Will Rudder Boost function with bleed air valves in ENVIR OFF?

The Rudder Boost function is designed to enhance the controllability of the aircraft, particularly in scenarios where asymmetrical thrust might lead to difficulties in handling the aircraft. It accomplishes this by increasing hydraulic pressure to the rudder system, making it more responsive.

For the Rudder Boost to operate properly, it relies on the availability of hydraulic pressure, which is supplied by the bleed air system, even if the ENVIR (environmental control) system is turned OFF. The bleed air valves are responsible for directing compressed air for use in various aircraft systems, and even when the ENVIR system is inactive, the Rudder Boost can still utilize available bleed air to function.

This interaction illustrates that the Rudder Boost system is designed to maintain operational capability in critical flight conditions, irrespective of the state of the ENVIR system. Therefore, the correct choice is that the Rudder Boost will indeed function with bleed air valves in the ENVIR OFF position.