Hand solo said
Seems that most non american 4 engine operators are tweaking the tale of the tiger, but I don't remember anyone getting bitten by a double unrelated engine failure anytime recently.
How do you know that other engines aren't effected after you lose one? Could be a maint. error! Eastern had a VERY near miss in Miami when they shut one down and started to continue to their destination when they lost 2 more and managed to get the 1st one shut down restarted and just staggered to the airport. Turned out a maint error had been made that wound up taking out all the engines. That incident lead to the change of regulations that no longer permitted US aircraft to keep going after an engine failure.
Even if it wasn't an engine failure from maint, lets say it was FOD. Well if you fod one engine it is quite possible the adjacent engine is damaged. Maybe you flew through some birds you didn;t see....
The ONLY way you can verify that no other engines are effected is to land and inspect them! AFTER you have inspected them, then you can perform a 3 engine ferry and take the aircraft to your maint. base.
Otherwise you are taking a NEEDLESS risk. This isn't a war. London won't be bombed if you don't get up and intercept the inbounds. Safety first.
Cheers
Wino