# SDR UPS99428338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N675UP](https://openairdocs.org/aircraft/N675UP), registered now
- Make and model: Boeing 747123
- Aircraft serial: 20390
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxy Bottles
- Condition: Failed
- Location: Cockpit
- Stage of operation: CL
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS99428338

## Discrepancy

INSPECTION TYPE-N/A, CREW OXYGEN DROPPED FROM 1200 PSI AT PREFLIGHT TO 500 PSI AT TOP OF CLIMB.  REMOVED AND REPLACED LOWER AND UPPER 02 BOTTLES, LEAK CHECKED GOOD.  AIR TURNBACK.

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