Flush toilets are the most common type of toilet found in passenger aircraft.
Each toilet is completely self-contained, its waste collection tank being mounted directly below the toilet bowl.Each toilet unit is installed above the toilet compartment.
It consists of:
A seat.
Cover and surround.
Toilet bowl
Tank top and flushing system
Waste tank and outlet bowl
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Below diagram shows an overview operational characteristics of an liquid flush type toilet.the ground connections and the ground flushing and cleaning method is very clearly shown in it.