# SDR CALA2026012613253

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N61887](https://openairdocs.org/aircraft/N61887), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 42192
- Aircraft time: 33,332 hours, 12,311 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Module
- Part number: 32612110101
- Part serial: 000351507
- Condition: Odor
- Location: Zone 100
- Part time: 19,109 hours, 7,226 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026012613253

## Discrepancy

CHRONIC LVL 2 DUE TO REPEATED WRITE-UPS OF NGS, DEGRADED LIGHT WI TH BITE HISTORY OF NGS ASM FAILED WITH MX MSG 47-30063,   PERFORM DRAIN CAP FUEL LEAK CHECK IAW AMM 47-21-00-700-802. IF FUEL SMELL OR FUEL FOUND, COMPLETE AMM REMOVALS & ALSO REPLACE ASM & O2 SENS OR REF AMM 47-11-01/02 FOR CONTAMINATION. IF NO FUEL SMELL FOUND , PERFORM FIM 47-31 TASK 839 STEP F FAULT ISOLATION AND REPLACE APPLICABLE LRUS. NOTE * O2 SENSOR RECENTLY REPLACED TWICE. THX! CARRIED BY ELB ALSO INSPECT FILTER ASSY FOR DAMAGE AS WE'VE SEEN CRACKS IN THE FILTER HEAD & BOWL CAUSING THIS MESSAGE REF IPC 47-32-04-01. THX LOCKED FOR WORK COMPLETION REF GMM 05-30-05 UNLOCKING FOR CLEARING. MTX FOUND ASM FAILED. PERFORMED FUEL LEAK CHECK FOUND NO FUEL SMELL OR FUEL REF AMM 47-21-00 FOUND FAULT 47-30063 STILL PRESENT AS WELL. VERIFIED NO CONTAMINATION ON O2 SENSOR. REMOVED ASM & FOUND ASM FAILED. REPLACED ASM IAW AMM 47-11-01 PERFORMED ELECTRICAL TEST & SYS TEST OPS AND LEAK CHKD GOOD.

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