# SDR CALA2026060816913

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 5, 2026
- Submitted: June 8, 2026
- Operation: Air carrier
- Aircraft: [N686UA](https://openairdocs.org/aircraft/N686UA), registered now
- Make and model: Boeing 767-3CB
- Registry model: [Boeing 767-3CB](https://openairdocs.org/model/boeing-767-3cb) (OpenAirDocs)
- Aircraft serial: 33468
- Aircraft time: 78,775 hours, 13,631 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: MC1019151
- Part serial: 8102
- Condition: Leaking
- Location: Zone 200
- Part time: 27,419 cycles
- 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/CALA2026060816913

## Discrepancy

CREW OXYGEN PRESSURE LEAKING DURING FLIGHT FROM O2 MASK BEHIND C A ON ARRIVAL CREW NOTED; OXYGEN LEVEL AT 1620 PSI ON DEPARTURE. BY ARRIVAL CREW O2 DEPLETED TO 1460 PSI. CAPT NOTICED O2 MASK BEHIND (CAPT SEAT) LEAKED. PERFORMED GVI OF AFT (LH) STOWAGE BOX PER AMM TASK 35-11-51-200-801, DID NOT NOTICE ANY MAJOR DISCREPANCIES. WILL REQUIRE FURTHER INSPECTION FOR LEAKS. SERVICED CREW OXYGEN TO 1730 PSI IAW AMM 12-15-08-613-110. REMOVED AND REPLACED OBSERVER 2 LEFT SIDE COCKPIT CREW OXYGEN MASK IAW AMM 35-11-51-004-059 AND AMM 35-11-51-404-060. OPS CHECK GOOD LEAK CHECK GOOD.

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