SRE
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All you needed to do was state the case. If you actually strip out the times the ac goes u/s then your list gets shorter. If an ac is u/s going past a base then depending on the snag, cos we might have loads of engineering mates there, it would be better than landing somewhere that may take some time to get the spares and eng support to. You must have tried to recover spares from custom houses around the world - it is a pain.
By the way I know diddley squat about modern engineering practices pertinent to your type so why should you know what our regulations are? That is the point - folks have a dig when they do not understand crew rest periods and crew duty days that are in place to safeguard you, the passenger, from harm. Everybody has regs they follow and it is not for all to know each others but to understand that folks, if they are the calibre we foster, will try and go that extra mile or hour to ensure the task is completed as long as it does not compromise the safety of our customer - that is you.