Originally Posted by
John Farley
The 146 ... was designed as a hub and spoke aeroplane to open up Africa where there were no facilities at the end of the spoke. Literally none.
Because they did not want it stuck at the end of a spoke with an engine problem they decided it had to have four engines and be certificated to RTB without pax on three...
jondc9 will tell you about how the 146 3-engine ferry was routine ops in wild & wooly Callyfornia!