What actually happens when you flush an aeroplane toilet?

[ahlam1399]

http://img-s-msn-com.akamaized.net/tenant/amp/entityid/AAmhRmk.img?h=100&w=100&m=6&q=60&o=f&l=f&x=754&y=374If youâ??ve ever imagined pee or poop dropping out of an airplane like a surprise crop-dusting, that actually used to happen.

أكثر... (http://www.msn.com/en-in/travel/other/what-actually-happens-when-you-flush-an-airplane-toilet/ar-AAmj0Kk?srcref=rss)