# SDR CALA2026080518294

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2026
- Submitted: August 5, 2026
- Operation: Air carrier
- Aircraft: [N77261](https://openairdocs.org/aircraft/N77261), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31582
- Aircraft time: 78,028 hours, 27,269 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Sensor
- Part number: 3522W000002
- Part serial: 8399
- Condition: Faulted
- Location: Oxygen Sys
- Part time: 22,384 hours, 6,183 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026080518294

## Discrepancy

NGS DEGRADED,  BLUE LIGHT ILLUMINATED.  FOUND FAULT NGS OXYGEN SENS FAIL ON EXISTING FAULT.  PERFORMED BITE TEST REF 47-31 TASK 801. TEST FAILED OXYGEN SENSOR FAIL MESSAGE 47-30062.  T/S CONTINUE IAW FIM 47-31, TASK 838.  REPLACED NGS SYSTEM OXYGEN SENSOR, PERFORMED BONDING CHK, CHKD GOOD. PERFORMED ELECTRICAL SYS OPS TEST. TEST PASSED, DEGRATION LIGHT HAS RETURNED TO GREEN STATUS IAW AMM 47-42-03-420-801, AMM 47-00-00-800-801.  C/W AMM 47-42-03-200-001. OXY SENSOR INLET TUBE INSP,  FOUND NO FUEL ODOR & NO LIQUID FUEL PRESENT. BONDING CHK IS WITHIN LIMITS.

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