Erj-170 flight crew reported the left engine ingested a cone shortly after gate arrival.

Attributes
ACN	1463025
Time
Date	201707
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 500
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter FOD

Narrative:

We parked at the gate in ZZZ. The APU was MEL'd and once parked had the left engine running while the right engine was shut down waiting for the gpu to be connected to the aircraft. In ZZZ the jetways have to be in place before the gpu can be connected. I had my hand on the #1 start/stop selector just in case I had to shut down the #1 engine for any abnormality. Once the jetway was in place I felt what seemed to be a loud bang coming from the left side of the aircraft. A cone was ingested into the #1 engine. I immediately shut down the #1 engine and assessed the situation making sure both flight attendants and passengers were ok. I examined the surrounding area and felt it was safe to deplane the passengers.myself and the first officer followed the flight operations manual. Once we landed; we could have called ops to let them know that the left engine would remain on until the external power was connected. Complacency by the ramp crew noticing the left engine running and the red beacon 'on' was also mistake. Looking back I could have shut down both engines to prevent this from happening. Distraction is the true culprit.

Original NASA ASRS Text

Title: ERJ-170 flight crew reported the left engine ingested a cone shortly after gate arrival.

Narrative: We parked at the gate in ZZZ. The APU was MEL'd and once parked had the left engine running while the right engine was shut down waiting for the GPU to be connected to the aircraft. In ZZZ the jetways have to be in place before the GPU can be connected. I had my hand on the #1 Start/Stop selector just in case I had to shut down the #1 engine for any abnormality. Once the jetway was in place I felt what seemed to be a loud Bang coming from the left side of the aircraft. A cone was ingested into the #1 engine. I immediately shut down the #1 engine and assessed the situation making sure both Flight Attendants and passengers were ok. I examined the surrounding area and felt it was safe to deplane the passengers.Myself and the First Officer followed the Flight Operations Manual. Once we landed; we could have called Ops to let them know that the left engine would remain on until the external power was connected. Complacency by the Ramp crew noticing the Left engine running and the Red Beacon 'On' was also mistake. Looking back I could have shut down both engines to prevent this from happening. Distraction is the true culprit.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.