# SDR 2026FA0000050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2026
- Submitted: January 21, 2026
- Operation: General aviation
- Aircraft: [N540SF](https://openairdocs.org/aircraft/N540SF), registered now
- Make and model: Bolkms BK117D3
- Aircraft serial: 21230
- Aircraft time: 1,247 hours, 3,190 cycles
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Shutoff Valve
- Part number: 0090288900
- Condition: Failed
- Location: Oxygen Sys
- Part time: 650 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000050

## Discrepancy

LIQUID OXYGEN SHUTOFF VALVE GOT HOT AND MALFUNCTIONED.  CAUSING LOSS OF LIQUID OXYGEN TO PATIENT.

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