# SDR CALA2026050415943

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 30, 2026
- Submitted: May 4, 2026
- Operation: Air carrier
- Aircraft: [N36444](https://openairdocs.org/aircraft/N36444), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 31643
- Aircraft time: 47,577 hours, 17,370 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Part number: 6454052
- Part serial: 8777
- Condition: Failed
- Location: Zone 100
- Part time: 47,537 hours, 17,359 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/CALA2026050415943

## Discrepancy

LEFT RECIRC FAN HAS LOW FLOW. FOUND DURING SMOKE/FUME IN CABIN INSPECTION. REQUESTING DEFFERAL 2131B FOR LEFT RECIRC FAN INOP. TOMC APPROVED COMPLIED WITH DEFFERAL. REMOVED AND REPLACED LH RECIRCULATING FAN IAW MM 21-25-02. OPS CHECK GOOD.

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