# SDR UIEA2024020900074

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2024
- Submitted: February 12, 2024
- Operation: Air carrier
- Aircraft: [N476MC](https://openairdocs.org/aircraft/N476MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29256
- Aircraft time: 96,336 hours, 17,710 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Indicator
- Condition: False Indication
- Location: Crew Oxygen
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2024020900074

## Discrepancy

AIR TURNBACK DUE TO CREW O2 QUANTITY LOW (SUSPECT LEAK)(<P>PERFORMED LEAK CHECK FOR OXY BOTTLES / LINES / ALL MASKS, NO LEAK FOUND. R/R CREW OXYGEN VOLTAGE AVERAGING UNIT AND OPS / IND CHECK GOOD PER AMM 35-41-12.</P>)

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