EMB ERJ 145 ER/LR
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Situational Awareness; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
We left an airplane for overnight with Engine Number 2 and APU (Auxiliary Power Unit) running. Earlier that day we came from ZZZ1 and shut down Engine Number 1 during the taxi after we got 2 minutes after spool down. Then we parked at the gate and started deplaning. We ran terminating checklist; then I packed my flight bag and left for a walk around and never got back to the cockpit. I went around the airplane wearing hearing protection; so I could not hear the engine and APU. I can't remember seeing the fan blades spooled up; either I missed them or they didn't catch my attention somehow. Everything seemed normal for me; so I finished exterior inspection and got up on the jet bridge; where I met the rest of the crew and we left.
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EMB-145 flight crew reported that they left the aircraft for the evening with the Number 2 Engine and Auxiliary Power Unit still running.