B717 fight crew reports forgetting to shut down the right engine after gate arrival then departing s...

Narrative:

Landed on runway 28 and taxied toward gate. A few minutes later after getting engine cool alert and before crossing the runway 27 left; for some strange reason I thought I shut down the right engine. Then taxied only on left engine to the gate since in my mind the right engine was shut down. Parked at the gate and after getting the ext pwe avail alert I shut down the left engine. My first officer had to use the restroom so I told her she can go to restroom after turning the seat belt sign off. Then I started to do the parking checklist. I left to get some food and when I returned I was told that right engine was running for few minutes and ramp people told my first officer and she shut it down. I had a meeting with [the chief pilots] and I told them what exactly happened. Up until now some how I still think I shut the engine down few minutes after landing. I honestly don't know what happened and I really can't associate it with any factor. I wasn't over loaded or fatigued. Just an honest mistake. My mind played a game with me since I really; really thought I shut the engine down.

Original NASA ASRS Text

Title: B717 fight crew reports forgetting to shut down the right engine after gate arrival then departing separately to obtain lunch. The First Officer returns first and is informed the right engine is still running; which is shut down.

Narrative: Landed on runway 28 and taxied toward gate. A few minutes later after getting ENGINE COOL alert and before crossing the runway 27 left; for some strange reason I thought I shut down the right engine. Then taxied only on left engine to the gate since in my mind the right engine was shut down. Parked at the gate and after getting the EXT PWE AVAIL alert I shut down the left engine. My First Officer had to use the restroom so I told her she can go to restroom after turning the seat belt sign off. Then I started to do the parking checklist. I left to get some food and when I returned I was told that right engine was running for few minutes and ramp people told my First Officer and she shut it down. I had a meeting with [the Chief Pilots] and I told them what exactly happened. Up until now some how I still think I shut the engine down few minutes after landing. I honestly don't know what happened and I really can't associate it with any factor. I wasn't over loaded or fatigued. Just an honest mistake. My mind played a game with me since I really; really thought I shut the engine down.

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.

Attributes
ACN	1212480
Time
Date	201410
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B717 (Formerly MD-95)
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Turbine Engine
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown

B717 fight crew reports forgetting to shut down the right engine after gate arrival then departing separately to obtain lunch. The first officer returns first and is informed the right engine is still running; which is shut down.