# SDR FDEA201810303050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2018
- Submitted: October 31, 2018
- Operation: Air carrier
- Aircraft: [N854FD](https://openairdocs.org/aircraft/N854FD), registered now
- Make and model: Boeing 777-FS2
- Registry model: [Boeing 777-FS2](https://openairdocs.org/model/boeing-777-fs2) (OpenAirDocs)
- Aircraft serial: 37725
- Aircraft time: 32,797 hours, 5,107 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Switch
- Condition: Defective
- Location: Stowage Box
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201810303050

## Discrepancy

DURING PREFLIGHT OBSERVER SEAT OXYGEN MASK "PRESS TO TEST" SWITCH GETS STUCK IN DOWN POSITION. REMOVED AND REPLACED 1ST OBSERVER OXY STORAGE BOX, OPS CK'S NORMAL.

---
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.