MD-80 Series (DC-9-80) Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Returned To Gate
Aircraft
After pushback and engine start; upon turning air conditioning packs on; acrid smoke began coming out of vents. Shut off packs and recirculating fan while simultaneously returning to gate. Once the packs were turned off the smoke stopped increasing. Deplaned normally without incident. Smoke appears to have come from a loss of the left hydraulic system.
MD-80 Captain reported smoke in the aircraft when packs were turned on after pushback. Flight returned to the gate.