The waste and blue cleaning fluid ends up in a storage tank under the floor, in the very back of the cargo hold of the aeroplane. With so many people on the plane using the toilets, you can imagine how big the storage tank is!
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What happens if you flush a toilet's tank in an airplane while sitting on it? Absolutely nothing. Your arse might ache a bit afterwards. Stories about people being sucked through the toilet and flushed out the plane are urban legends.
The Skychem is used in place of water in the bowl. When one flushes the toilet, the waste is sucked out by the vacuum, and placed into a large holding tank. While the vacuum system in use is loud, it is nothing to be afraid of.
While modern trains won't litter the tracks with human excrement, the traditional method did just that. This is what was known as a hopper toilet. It could either be a simple hole in the floor (also known as a drop chute toilet) or a full-flush system.
Airline pilots take turns using the bathroom nearest the cockpit during a flight. There are no bathrooms installed in the cockpit. For airplanes with a single pilot, diapers, catheters, or collection devices are used if they are unable to land to use the airport bathroom.
While fuel dumps don't happen every day, they're also not uncommon. Nor do they usually represent a major emergency. In fact if an aircraft is taking the time to dump fuel before landing, that's likely an indication that the issue forcing the plane to land is serious but not critical.
Yes, they use the same toilets. I often fly on 737s, and when the cockpit crew need the toilet, the flight attendants have a process to maintain security. No special toilets for crew. We usually go to the front toilets from business class as they tend to stay cleaner.
During those times, passengers can realistically expect about 10 minutes of peace inside of the restroom to take care of any pressing issues. But after 20 minutes, though, she warned that a flight attendant may come and knock on the door.