B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Gate; General Flight Cancelled / Delayed
Aircraft
Immediately after engine start; we noticed a burning odor in the cockpit. It did not go away; and after a few seconds the FO (PF) noticed a small amount of white electrical smoke above the aft portion of the center console. We donned oxygen masks and began running the 'SMOKE FIRE FUMES' checklist. We communicated with the flight attendants to get their assessment of the situation; and determined the best course of action was to return to the gate and deplane the passengers. The ground crew was still hooked up to the interphone so we interrupted the QRH checklist and coordinated a return to the departure gate (about 1 airplane length away). We then called ground to roll CFR. We also coordinated with Ramp Control to ensure a gate agent would meet us upon our return. Once the aircraft was at the gate with the door open; we began deplaning the passengers through the 1L door. This proceeded in an orderly fashion.As the passengers were being removed; the odor was still present though less significant. CFR and maintenance personnel met us almost immediately after gate arrival. With CFR present; we decided not to finish the QRH procedure in favor of completely shutting off all electrical power on the aircraft; which we did. The emergency lights remained illuminated for the remainder of the deplaning. After all passengers deplaned; both pilots conducted a visual search of the aircraft including all lavatories to ensure no passengers remained. The Captain then released the aircraft to maintenance and CFR personnel; who remained on board. The Captain then gathered the entire crew in the jet bridge immediately outside the aircraft and conducted a debriefing.
B767 First Officer reported returning to the gate after observing smoke in the cockpit immediately after pushback and engine start.