# SDR P5CA2026042800021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2026
- Submitted: April 29, 2026
- Operation: Air carrier
- Aircraft: [N777SA](https://openairdocs.org/aircraft/N777SA), registered now
- Make and model: Boeing 777FZB
- Registry model: [Boeing 777FZB](https://openairdocs.org/model/boeing-777fzb) (OpenAirDocs)
- Aircraft serial: 37989
- Aircraft time: 68,675 hours, 8,180 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Box
- Part number: MXP4023
- Part serial: SE49348
- Condition: Broken
- Location: Zone 200
- Stage of operation: TX
- How discovered: C
- Nature of condition: L
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2026042800021

## Discrepancy

CAPTAIN O2 MASK PRESS TO TEST AND RESET TAB IS BROKEN.  SWAPPED CAPT & 1ST OBSERVER O2 BOX PER 777 AMM 35-11-18 FOR DISPATCH. PLACED 1ST OBSERVER SEAT & ASSOCIATED EQUIPMENT ON MEL.  LP 1940127 M2: REMOVED AND REPLACED 1ST OBSERVER'S O2 BOX IAW AMM 35-11-18. OPS CHECK & LEAK CHECKED GOOD IAW IPC 35-11-18-01.

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