747 critical engine!

[lamjura]

Can nay one answer the ff?

1. Is there a critical engine in 747 ? if yes then which one and what makes it a critical engine ?

2. What is tandem bogie ?

3. If you take off 747 IFR minimum and experience an engine failure after some time, do you come back an land or continue to destination ?

Thanks !

lamjura

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