Why aren’t people allowed to use the bathroom when the plane is fueling?
In: Other
It’s not the fueling; it’s probably the ground servicing of water and waste. The airplane has a potable water tank for things like the sinks in the lavs, coffee maker, etc., as well as a waste tank the lav toilets flush into. During ground servicing, they fill the water tank and empty the waste tank. It would be bad for the systems to be actively using them during servicing, so the systems are deactivated during this service. If a passenger used a lavatory during servicing, they wouldn’t be able to flush the toilet or wash their hands until servicing is over.
Edit to add source: I’m a pilot on the Airbus 320
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