# SDR CALA2026072117908

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2026
- Submitted: July 21, 2026
- Operation: Air carrier
- Aircraft: [N444UA](https://openairdocs.org/aircraft/N444UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 824
- Aircraft time: 84,464 hours, 35,814 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: MF20010
- Part serial: 6310
- Condition: Leaking
- Location: Captain
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026072117908

## Discrepancy

OXYGEN MASK LEAKING.  VERIFIED CAPTAINS OXYGEN MASK IS LEAKING AT A RAPID RATE & UNABLE TO STOP FLOW.  SWAPPED CAPTAINS & 2ND OBSERVERS OXYGEN MASKS,, OPS CHKD GOOD, IAW AMM 35-12-41; DECLARING 2ND OBSERVERS SEAT INOPE DUE TO MASK.  CONFIRMED NO LEAKS IN CURRENT MASK & CREW OXYGEN LEVEL OK FOR FLIGHT.  DEFECTIVE MASK IS BEING LEFT ON ACFT & REMAINS DISCONNECTED, MEL COMPLIED WITH AND PLACARDS APPLIED.   RETURNED 2ND OB MASK TO ORIGINAL POSITION.  R & R DEFECTIVE CAPT O2 MASK, OPS CHKD GOOD.  REMOVAL/INSTALLATION/TESTING OF MASKS DONE IAW AMM 35-12-41.  PLACARD REMOVED.

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