# SDR DALA2021011900342

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 16, 2021
- Submitted: January 19, 2021
- Operation: Air carrier
- Aircraft: [N504DN](https://openairdocs.org/aircraft/N504DN), registered now
- Make and model: Airbus A350-941
- Registry model: [Airbus A350-941](https://openairdocs.org/model/airbus-a350-941) (OpenAirDocs)
- Aircraft serial: 0160
- Aircraft time: 13,719 hours, 1,243 cycles
- System (JASC): [5270 · Door Warning System](https://openairdocs.org/jasc/5270)
- Part: Pressure Switch
- Condition: Malfunctioned
- Location: Cabin Doors
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2021011900342

## Discrepancy

CABIN RED PSI PSI LIGHTS FLASH ON DOORS, CABIN SHOWS 0 PSI.  CORRECTIVE ACTION: R & R BOTH DIFFERENTIAL PRESSURE SWITCHES (301MS, 302MS), REF A350 A 52-71.  PERFORMED BITE TEST OF BOTH DSCS REF A350 A52-71.  BOTH PASS, CHECKS GOOD.

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