# SDR QV1Y2021111117971

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 2021
- Submitted: November 11, 2021
- Operation: General aviation
- Filed by: [Jet Aviation AG Basel, repair station QV1Y440K](https://openairdocs.org/faa-repair-station/QV1Y440K/jet-aviation-ag-basel.md) (OpenAirDocs)
- Aircraft: [N7X](https://openairdocs.org/aircraft/N7X), registered now
- Make and model: Amd FALCON7X
- Aircraft serial: 33
- Aircraft time: 2,113 hours, 775 cycles
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Oxygen System
- Part number: 449249
- Part serial: 141
- Condition: Leaking
- Location: Zone 100
- Part time: 2,113 hours, 775 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QV1Y2021111117971

## Discrepancy

F7X S/N 033 REGISTRATION N7X WAS INDUCTED AT JET AVIATION BASEL UNDER PROJECT BN7X0002 TO TROUBLESHOOT A SUSPECTED PASSENGERS OXYGEN LEAK. THE TROUBLESHOOTING PERFORMED UNDER PROJECT BN7X0002 WORK ORDER 4000 CONFIRMED THAT THE ELECTRICAL FLOW CONTROL UNIT (EFCU) P/N 449249 S/N 141 WAS THE CAUSE OF THE FAILURE.
THE SUBJECT FAILURE WAS CORRECTED UNDER PROJECT BN7X0002 AND THE FAULTY UNIT REPLACED WITH P/N 449249 S/N 153. AN INTERNAL SAFETY REPORT WAS FILED UNDER NO. 17971.

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