Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Mitsubishi Heavy Industries, Ltd. (Mitsubishi) MU-2B series airplanes. The proposed action would require removing the vent check valve assembly from the bulkhead between the fuel tanks. The proposed action results from an incident where both engines on an affected airplane failed during the end of a flight. The incident is attributed to the fuel filler caps on the top of the wings not sealing correctly. The actions specified by the proposed AD are intended to prevent the inability of both engines to utilize the entire fuel supply because of the outboard fuel not transferring to the center tank, which could result in an uncommanded engine shutdown.