# SDR CALA2026013013440

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2026
- Submitted: January 30, 2026
- Operation: Air carrier
- Aircraft: [N2644U](https://openairdocs.org/aircraft/N2644U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 63724
- Aircraft time: 37,350 hours, 4,002 cycles
- System (JASC): [3830 · Waste Disposal System](https://openairdocs.org/jasc/3830)
- Part: Valve
- Condition: Stuck
- Location: Zone 900
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026013013440

## Discrepancy

LAVATORY 4G SINK BOWL FULL OF GREY WATER AND OVERFLOWING, FOWL ODOR THROUGH OUT CABIN.  TROUBLESHOT SYS.   RESTRICTOR VALVE DEACTIVATED OPEN LOCKED FOR REPAIR UNLOCKING LAV 4G SINK BOWL OPS CHECK GOOD,  NO OVERFLOW IAW AMM 38-31-00.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.