Jim Sparks

The Falcon 50 does incorporate two independent wing fuel tank "valve boxes" incorporating over pressure relief valves coupled with a stand alone wing tank pressure reducing / over pressure relief valve. Due to the commonality in this system, in other than a static situation, both overpressure relief valves and the regulating valve would have to fail before any over pressure would occur. The pressure relief valves along with the entire system do have manufacturer's recommended intervals for both operational and function testing. The reliability of the of the "valve boxes" have not been stellar so a change to the interval of inspection may be a more practical solution.