Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
On takeoff aft flight attendants reported effluent coming from one of lavatories into galley. Lavatories all failed [and] toilets would not flush for 8 hour flight. Due to health/hazard factor with effluent in aft galley and fumes/vapors decided to perform overweight landing. Performed uneventful landing. Maintenance needs to clean probes for waste tanks of lavatories so this does not cause false indicators that effluent tanks are full. We confirmed they were dumped before departing.
A330 Captain reported returning to departure airport after a Flight Attendant reported effluent was leaking from the lavatory into the galley area.