Why does the Boeing 747-400 have 3 engine types?

One iconic plane, three very different engines. Unravel the mystery of the 747-400's multi-engine design and the strategic ...
Flightglobal

Shed parts from 747-400 freighter’s unmodified engine caused property damage and injuries

Investigators have determined that a Longtail Aviation Boeing 747-400 converted freighter that shed turbine parts over a town after departing Maastricht had not been modified with cooling features ...