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PZLBelfegor

MD-11 fuel transfer

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Hello.I'd like to ask, what is the reason of having transfer pumps in the main tanks? It appears that I can achieve the same results (eg. tank 1 feeding engines 1 and 2) just using crossfeeds and main pumps, without even touching transfer pumps switches. Are they installed just in case of failure of main pumps, or there is other reason?Moreover, I'd like to know (just of curiosity), if there is a way of transferring fuel to the tail tank when the automatic fuel management is turned off? I could only transfer fuel from tail, and I don't know how to do that the other way around.And, while we are at the topic of fuel, there is a quotation from the manual:

The FSC will transfer and replace fuel from the tail tank to purge water.
I'm a bit confused - what is the connection between fuel and... purging water?Best regards,Dymitr

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