EMB ERJ 145 ER/LR
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General Maintenance Action
Aircraft
We were cruising at FL280 when I heard a buzzing noise coming from the floor on the Captain's side that lasted a couple of seconds. Then my First Officer and I smelled smoked in the flight deck. I told the First Officer to put on [the] oxygen mask and smoke goggles. We accomplished the QRH checklist and [diverted to an alternate airport].After landing; maintenance told us the #2 avionics fan shorted out and that was what probably caused the smell of smoke and buzzing noise.
EMB-145 Captain reported a buzzing noise and smoke in the cockpit that was later traced to a short in the #2 avionics fan.