I have not been following this story, but the fact that both engines surged at the same time can indicate a fundamental design problem. Compressor surge (to much instantaneous compression) or stall (the opposite: internal flow separation leading to not enough air compression, hence flameout) can happen for a variety of reasons, one of which is when the air enters the engine in a (usually gross) off-design direction. The airflow characteristics into the engines to create a surge should not be anything closely related to that which is associated with the envelope of normal flight ops (such as the takeoff of the Air Sudan flight). It will be quite interesting to see if indeed the problem is fundamental to the engine design.