# SDR DL757011687

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2001
- Submitted: November 29, 2001
- Operation: Air carrier
- Aircraft: [N900PC](https://openairdocs.org/aircraft/N900PC), registered now
- Make and model: Boeing 757*
- Aircraft serial: 28446
- Aircraft time: 15,286 hours, 6,971 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: O-Ring
- Part number: MS938505
- Condition: Leaking
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL757011687

## Discrepancy

CREW O2 AFTER TAKEOFF DROPPED AT A RATE OF 10 PSI PER MIN.  AT TAKEOFF O2 LEVEL WAS 1850 AFTER 2 HRS OF FLT O2 HAD DROPPED TO 1380 PSI.  FOUND BOTTLE REGULATOR FITTING LEAKING.  REPLACED FITTING O-RING SEAL, SERVICED BOTTLE TO 1760 PSI AND LEAK CHECKS OK.

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