What is the altitude limitation with dual boost pump failures and an inoperative XBP cross feed?

The altitude limitation with dual boost pump failures and an inoperative XBP cross feed is indeed set at 25,000 feet. This limitation is based on the fuel system's ability to maintain adequate fuel flow and pressure without the assistance of the boost pumps. When both boost pumps are non-operational, the aircraft relies on gravity feed from the fuel tanks to supply the engines. At altitudes above 25,000 feet, the risk of fuel starvation increases significantly due to lower atmospheric pressure, which affects fuel vaporization and delivery to the engines.

The cross feed system plays a crucial role in allowing for the transfer of fuel between tanks. However, if it is inoperative alongside the dual boost pump failures, the aircraft's ability to manage fuel becomes severely limited. The 25,000-foot ceiling is a safety measure to ensure that, even in a compromised fuel system, the engines can receive enough fuel to operate effectively during flight.

The other altitude limits presented in the choices do not align with the operational specifications for the Falcon 7X under such failure conditions, underscoring the importance of understanding the aircraft's limitations and emergency procedures.