I still cannot see what all the fuss is about, as long as it was a ferry flight, and especially if the Company were aware of what was happening.
The ONLY thing is of course it should have been reported into Singapore before any revenue flight.
This sort of thing is hardly new, have seen many things like this over the years.
We had an Electra many years (decades) ago, here in BNE undergoing a routine scheduled service, one engine was found to be just about
full filter of metal. No spare in BNE, only spare engine was in MEL. Even a ferry flight could not DEPART on 3 engines, so the Crew took it as a ferry to MEL with the
engine just idling on take off, once airborne they shut it down, contacted ATC to tell them they had suffered an engine failure and were continuing to MEL on three engines.
