Originally Posted by SandyW
For a start there are 3 spare engines (presumably undamaged) on the airframe that suffered the failure
Only 2 presumably undamaged engines, the number 1 engine was drowned by fire fighting foam to shut down so it's damaged by the use of the foam (the foam is corrosive so the metal will/can be affected by it, and then I don't mention any electronics on the engine which will have probably also got a bath of foam). And nobody knows if the other 2 engines are OK... I can think that one wouldn't allow those engines to be used for now even if they show no direct visible damage...