1990 we flew 727's out of Managua, Nicaragua so did steep climbs and descents to get as high as possible knowing there were shoulder AA missles unaccounted for in the country. A Russian Mig base was on the north side of the lake by Managua. We should know soon if cargo shifted aft or trim caused this crash. It sounds very similar to the DC8 crash at MIA when the cargo slid back at high pitch attitude on take off. The DC8 didn't have the bear claws on the floor securing the cargo as I recall.