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B737 captain reported all of the aircraft lavatories did not work so they were forced to divert and land overweight.
| Attributes | |
| ACN | 1619434 |
| Time | |
| Date | 201902 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Waste Water Disposal System |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Commercial Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance |
Narrative:
We departed ZZZ with MEL 38-xx. Per the MEL; lavatories were tested for proper function above 16;000 feet and again at level off. All attempts failed to produce the expected results. Flight attendants attempted to operate all of the lavatories numerous times; yet they all remained inoperative. We contacted dispatch and began a turn back to ZZZ.[company operations] determined ZZZ1 was a better choice to accommodate passengers for a follow on flight. After obtaining landing data and conferring with dispatch; we elected to land overweight. ZZZ1 conducted a runway change. We obtained new landing data and completed an uneventful approach and landing. Uneventful overweight landing conducted on runway xxr in ZZZ1 after consultation with dispatch and [company operations] and obtaining landing data.placing MEL 38-xx on an ETOPS flight might not be the best choice. Checking the system occurs above 16;000 feet and if not successful; requires either an overweight landing or a very lengthy delay to burn off fuel and reduce weight.
Original NASA ASRS Text
Title: B737 Captain reported all of the aircraft lavatories did not work so they were forced to divert and land overweight.
Narrative: We departed ZZZ with MEL 38-XX. Per the MEL; lavatories were tested for proper function above 16;000 feet and again at level off. All attempts failed to produce the expected results. Flight attendants attempted to operate all of the lavatories numerous times; yet they all remained inoperative. We contacted Dispatch and began a turn back to ZZZ.[Company Operations] determined ZZZ1 was a better choice to accommodate passengers for a follow on flight. After obtaining landing data and conferring with Dispatch; we elected to land overweight. ZZZ1 conducted a runway change. We obtained new landing data and completed an uneventful approach and landing. Uneventful overweight landing conducted on Runway XXR in ZZZ1 after consultation with Dispatch and [Company Operations] and obtaining landing data.Placing MEL 38-XX on an ETOPS flight might not be the best choice. Checking the system occurs above 16;000 feet and if not successful; requires either an overweight landing or a very lengthy delay to burn off fuel and reduce weight.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.