As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: VERY LOUD HUMMING SOUND WHICH SOON AFTER VENT EXTRACT FAULT APPEARED FOLLOWED BY AN ELECTRICAL SMOKE SMELL WHICH DISSIPATED SHORTLY AFTER. **SUPPLEMENTAL REPORT FOR AALA202405170687: REPLACED EXTRACT AVIONICS FAN PER AMM 21-26-51.** (CLOSED)