Have an FA fingerprint as a tie breaker. Simple voting logic.
Yes ... that's flawless logic.
I can see it now. A raging in-flight fire. One of the pilots has a heart attack. The other is stuck up in the cockpit, with the autopilot refusing to leave cruise altitude until the
flight attendant comes up to the cockpit to bio-ID, at which point they can start an emergency descent.
This thread just keeps getting better and better.