# SDR UALA2012022401124

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 23, 2012
- Submitted: March 28, 2012
- Operation: Air carrier
- Aircraft: N407UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 456
- Aircraft time: 59,994 hours, 22,433 cycles
- Engine: Iae V2527A5
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: MF20534
- Part serial: 1507
- Condition: Leaking
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012022401124

## Discrepancy

F/O'S OXYGEN HARNESS FAILS TO INFLATE (IS LEAKING).   CREW COMMENTS:  HARNESS CLIP IS BROKEN HARNESS NOT ATTACHED AT TOP LEFT TEMPLE.  SWAP F/O MASK WITH 2ND OBSERVER MASK.  COMPLY WITH MEL FOR 2ND OBS SEAT.  SWAPPED F/O WITH 2ND OBSERVER MASK.  2ND OBS SEAT BLOCKED PER MEL.  RPLC'D MASK ON 2ND OBSERVER WOULD NOT TEST AND REST, NEEDS O2 BOX.  REPLACED MASK ASSEMBLY PER MM.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.