# SDR CALA2026012013110

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2026
- Submitted: January 20, 2026
- Operation: Air carrier
- Aircraft: [N773UA](https://openairdocs.org/aircraft/N773UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26929
- Aircraft time: 109,626 hours, 20,925 cycles
- System (JASC): [3830 · Waste Disposal System](https://openairdocs.org/jasc/3830)
- Part: Pressure Switch
- Part number: 214C40177
- Condition: Faulted
- Location: Zone 900
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026012013110

## Discrepancy

LAVS 1L 2L 2R 3LAFT AND 3R WILL NOT FLUSH.   REPLACED VACUUM CHECK VALVE IAW AMM 38-32-07. FOUND ALTITUDE SWITCH 38006 BROKEN.  REPLACED BOTH ALTITUDE SWITCHES IAW AMM 38-32-07. SIMULATED AIRCRAFT IN AIR MODE, ALL TOILETS OPS NORMALLY.

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