Are aircrafts allowed to release filtered waste when over oceans?

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Offline thedoc

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Paul asked the Naked Scientists:
Is it illegal for aircraft to discharge filtered liquid from toilets while in flight over the ocean?

What do you think?
« Last Edit: 16/07/2015 11:50:02 by _system »


Offline alancalverd

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Not illegal but not the best engineering solution - it can be difficult to close the discharge valve if it freezes, and this can compromise pressurisation. Some older aircraft filter and recirculate the flush water, more recent planes use a vacuum flush, but all passenger jets retain the waste for discharge on landing.

'Twas not always thus. A family friend was the bombardier on Lancasters in WWII. On the return leg he was clearly underemployed so his assigned duty was to chuck the chemical toilet out over Cologne, which he did with military precision, every night until the Nazis surrendered. I have not used Eau de Cologne since 1945. 
« Last Edit: 16/07/2015 15:55:48 by alancalverd »
helping to stem the tide of ignorance