please explain how a faulty rad alt will cause the engines to shut down?
I suspect that what they mean is the engines were throttled back to
Idle by the Autothrottle system. On some types the Autothrottle automatically retards the thrust levers to Idle in preparation for touchdown.
Why the aircraft then crashed slow and short is another matter.
Interesting that the Firies couldn't get into the cockpit through the door. They then concentrated first on the pax, only retrieving the pilot's bodies through a hole they cut in the roof, so Flight reports.