Egypt B738 near Cairo on Jul 1st 2014, toilettery

An Egypt Air Boeing 737-800, registration SU-GDA performing flight MS-767 from Cairo (Egypt) to Barcelona,SP (Spain), was enroute over the Mediterranean Sea about 45 minutes into the flight when the crew decided to return to Cairo after the toilet flush system failed. The aircraft landed safely back in Cairo about 90 minutes after departure.

A replacement Boeing 737-800 registration SU-GDC reached Barcelona with a delay of 3.5 hours.

Maintenance replaced the system relays and adjusted the waste drain valves before returning SU-GDA to service.