point8six:
The L-1011 operator doing the two engine ferry out of Mexico City was Eastern and it was a -1 not a -500. The No. 1 engine was inop, No. 3 failed on rotation. If it had been the No.2 engine that was the second failure the chances are they would not have been able to return.
411A:
B-System hydraulics is provided by the No. 2 engine, as is C-System.