Since this began, I have thought that whatever happened, baring any hijacking, or act of terrorism, had to have happend pretty quickly. My theory is that the sharp turn may have indicated that once the pilots became aware of a problem they attempted to turn the plane, but were unsuccessful . I think it went thusly: Fire shuts down electrical very rapidly, cockpit is engulfed, pilots make attempt to turn, they are overcome, plane flies on until it crashes or runs out of fuel and crashes. Which I'd not like to think was a possibility because the horror for the passengers was probably mind boggling. I recall seeing a video on some documentary years ago that the NTSB had done with some testing, and fire can nearly engulf a planes cockpit in seconds (as it can anywhere else). I seem to recall they had speculated that had happened to another plane that went down back in the 60's or early 70's. When they recovered the wreckage, the cockpit section was totally burnt out, but the fuselage, and engines were still intact. Mercifully, the passengers should have been dead from smoke inhalation (yeah not very merciful I know) before the plane finally crashed.