# SDR GTIA2026032639336

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 25, 2026
- Submitted: March 27, 2026
- Operation: Air carrier
- Aircraft: N677NK
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7690
- Aircraft time: 28,417 hours, 12,701 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Condition: Failed
- Location: Zone 100
- Stage of operation: DE
- How discovered: O
- Nature of condition: E, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/GTIA2026032639336

## Discrepancy

DURING FLIGHT WE COULD HEAR A LOUD HUMMING NOISE FROM NOSE SECTION. AFTER LANDING, WE GOT A REAL STRONG SMELL OF BURNING. THIS PERSISTED UNTIL PARKING. AFTER SHUT DOWN WE COULD HEAR A LOUD BUZZING FROM AVIANICS BAY BLOWER FAN WAS SHUT OFF AND SMELL AND SOUND STOPPED ( BLOWER FAN (AVIONICS VENTILATION) VENT AVNCS SYS FAULT NOT DISPLAYED )--

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