article_snippet.sent: The FAA said lavatory waste is contained in a holding tank that can only be opened from the outside .
article_snippet.sent: The FAA said lavatory waste is contained in a holding tank until a plane lands, and the apparatus to access a holding tank is located on the exterior of a plane.
article_snippet.sent: The FAA said that The FAA’s ‘physically impossible’ for a pilot to dump a tank while in flight, as The FAA is opened with an exterior lever.