What is the stability of a 777-like plane if the engines flameout and the autopilot disconnects and the pilots don't make any inputs? According to Wikipedia:


  If no control inputs were made following flameout and the disengagement of autopilot, the aircraft would likely have entered a spiral dive and entered the ocean within 20 nmi (37 km; 23 mi) of the flameout and disengagement of autopilot.


Does this mean the autopilot automatically disengages when both engines experience flameouts? If so, how likely is it it would enter a spiral dive within 37km of the flameout?

Are there any other control inputs the pilot could have made before flameout that would cause the plane to glide until it impacted the water?
Assuming CG is within limits, the plane is straight, level, and both engines flame out simultaneously, lacking any control inputs, the plane will dive until it reaches its elevator trim speed, then glide at that speed until it impacts.  As the directional and roll stability would be fairly good with the 777, without variable cross wind effects or any other yawing tendencies, it would probably be a straight in crash.

This scenario could be tested under controlled conditions.