Originally Posted by
vincentharris
So I am hearing the A319/A320 lavs don’t work because of pressure but I have flown these planes countless times and always used the lav in F if needed.
In fact on all my A319/A320 flights in the past this is the only time DL has said this
Two people have already explained it in this thread.
Below 16k feet, the lavs use a vacuum pump to flush. Above 16k feet, the lavs flush on the differential pressure between the cabin and the outside air.
On your flight, the pump was likely inop. But they can fly without it, the lavs just don't work until 16k feet.
In this case, the crew told the truth, very specifically. Yet half the people here called them liars. I give the GA props for keeping passengers informed, especially before boarding.