Pilot reported not realizing the engine was still running after opening the main cabin door.

Attributes
ACN	1661216
Time
Date	201907
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural Published Material / Policy

Narrative:

Upon opening the main cabin door; we received a master warning indicating that the left engine was running. I verified that it was not shutdown and initiated the shutdown procedure. I believe this occurred due to the thrust lever not being fully idle when parking. I was trying to deal with a ramp issue with the air stairs malfunctioning and must have been distracted by that to have not realized the before we opened the door.the shutdown checklist has a thrust lever idle item. I think we should replace it or add a new item that says engines verified off since it is possible to have an engine still running with a very slight displacement of the lever above idle.

Original NASA ASRS Text

Title: Pilot reported not realizing the engine was still running after opening the main cabin door.

Narrative: Upon opening the main cabin door; we received a master warning indicating that the left engine was running. I verified that it was not shutdown and initiated the shutdown procedure. I believe this occurred due to the thrust lever not being fully idle when parking. I was trying to deal with a ramp issue with the air stairs malfunctioning and must have been distracted by that to have not realized the before we opened the door.The Shutdown Checklist has a thrust lever idle item. I think we should replace it or add a new item that says engines verified off since it is possible to have an engine still running with a very slight displacement of the lever above idle.

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.