# SDR CALA2025090508513

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 2025
- Submitted: September 5, 2025
- Operation: Air carrier
- Aircraft: [N16709](https://openairdocs.org/aircraft/N16709), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28779
- Aircraft time: 84,044 hours, 30,710 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: MC1025104
- Part serial: 78037
- Condition: No Test
- Location: Zone 200
- Part time: 68,500 hours, 23,903 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025090508513

## Discrepancy

CREW OXYGEN MASK REGULATOR TEST.  CAPTAIN MASK REGULATOR UNIT HEAD HARNESS LEAKS WHEN TESTED.  REMOVED AND REPLACED CAPTAIN MASK REGULATOR IAW AMM 35-12-85. OPS AND LEAK CHECKED OK.

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