# SDR CALA2022050901176

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 2022
- Submitted: May 9, 2022
- Operation: Air carrier
- Aircraft: [N12125](https://openairdocs.org/aircraft/N12125), registered now
- Make and model: Boeing 757-200 SERIES
- Registry model: [Boeing 757-200 SERIES](https://openairdocs.org/model/boeing-757-200-series) (OpenAirDocs)
- Aircraft serial: 28967
- Aircraft time: 86,508 hours, 21,163 cycles
- System (JASC): [3500 · Oxygen System](https://openairdocs.org/jasc/3500)
- Part: Pressure Switch
- Part number: 214C40175
- Part serial: U003928
- Condition: Unserviceable
- Location: Flight Deck
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022050901176

## Discrepancy

(B757-35-3-0009) PASSENGER OXYGEN SYSTEM, ALTITUDE PRESSURE SWIT CH FAILS OPS CHECK. TRANSCRIBED FROM HAECO GSO NRC 9285968

---
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.