Narrative:

I had an XA20 report time to fly a 4 leg 11 hour day with captain. We flew ZZZ to ZZZ1 then back to ZZZ; had a 2 hour break then flew to ZZZ2 and back; ending in ZZZ. All 4 legs were uneventful. Upon finishing in ZZZ; I gave the captain the flight time; called in our times and fuel burn to operations; and then got up to say goodbye to the passenger. Once they finished deplaning; I got my bags off the airplane and did the postflt inspection and did not notice any visible discrepancies. After that; myself and the flight attendant left the airplane. She had a flight to catch and I wanted to beat traffic on the way home. The captain said it was fine and he would close up the airplane. The next day I got a call saying the next crew arrived at the airplane and found the #2 engine running and the plane closed up. I am almost positive I saw him secure the engine before I left the cockpit. Contributing factors could have been lack of sleep plus a long duty day; plus the captain stated he hadn't flown in 5 weeks due to vacation and recurrent ground school; plus the amount of noise at ZZZ could have prevented me from hearing our engine at the idle setting during the postflt. I also believe it to be possible that maintenance could have been on board for some reason after we left. In the future; I will pay more attention to the captain's parking flow and checklist; making sure I confirm visually he secures the #2 engine; plus I will pay more attention during my postflt. Supplemental information from acn 791000: I believed I parked and secured our aircraft at spot. I believe I followed the checklists and manuals and the first officer did a postflt inspection with no abnormalities. I received a phone call from a safety committee member asking about flight and the engine shutdown. I said I was surprised and embarrassed if it were my mistake. I'm 99% sure I shut it down correctly. And the first officer never mentioned it was running. We all left the plane and commissary was loading drinks. I checked out; went to crash pad. If this was my mistake; I am sorry and glad no one was hurt or injured. There are a lot of friends and co-workers I care about near our/my engines. This is a lesson learned for me either way. We just went over checklists usage in ground school earlier this month. And I briefed the first officer about diligent usage and the class. I will take extra measures to be diligent and patient with flows and read/do checklist procedures; doublechk and even triplechk.

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Original NASA ASRS Text

Title: CRJ200 FLT CREW IS ADMONISHED FOR FORGETTING TO SHUT DOWN THE NUMBER TWO ENGINE BEFORE CLOSING UP THE ACFT AND DEPARTING.

Narrative: I HAD AN XA20 RPT TIME TO FLY A 4 LEG 11 HR DAY WITH CAPT. WE FLEW ZZZ TO ZZZ1 THEN BACK TO ZZZ; HAD A 2 HR BREAK THEN FLEW TO ZZZ2 AND BACK; ENDING IN ZZZ. ALL 4 LEGS WERE UNEVENTFUL. UPON FINISHING IN ZZZ; I GAVE THE CAPT THE FLT TIME; CALLED IN OUR TIMES AND FUEL BURN TO OPS; AND THEN GOT UP TO SAY GOODBYE TO THE PAX. ONCE THEY FINISHED DEPLANING; I GOT MY BAGS OFF THE AIRPLANE AND DID THE POSTFLT INSPECTION AND DID NOT NOTICE ANY VISIBLE DISCREPANCIES. AFTER THAT; MYSELF AND THE FLT ATTENDANT LEFT THE AIRPLANE. SHE HAD A FLT TO CATCH AND I WANTED TO BEAT TFC ON THE WAY HOME. THE CAPT SAID IT WAS FINE AND HE WOULD CLOSE UP THE AIRPLANE. THE NEXT DAY I GOT A CALL SAYING THE NEXT CREW ARRIVED AT THE AIRPLANE AND FOUND THE #2 ENG RUNNING AND THE PLANE CLOSED UP. I AM ALMOST POSITIVE I SAW HIM SECURE THE ENG BEFORE I LEFT THE COCKPIT. CONTRIBUTING FACTORS COULD HAVE BEEN LACK OF SLEEP PLUS A LONG DUTY DAY; PLUS THE CAPT STATED HE HADN'T FLOWN IN 5 WKS DUE TO VACATION AND RECURRENT GND SCHOOL; PLUS THE AMOUNT OF NOISE AT ZZZ COULD HAVE PREVENTED ME FROM HEARING OUR ENG AT THE IDLE SETTING DURING THE POSTFLT. I ALSO BELIEVE IT TO BE POSSIBLE THAT MAINT COULD HAVE BEEN ON BOARD FOR SOME REASON AFTER WE LEFT. IN THE FUTURE; I WILL PAY MORE ATTN TO THE CAPT'S PARKING FLOW AND CHKLIST; MAKING SURE I CONFIRM VISUALLY HE SECURES THE #2 ENG; PLUS I WILL PAY MORE ATTN DURING MY POSTFLT. SUPPLEMENTAL INFO FROM ACN 791000: I BELIEVED I PARKED AND SECURED OUR ACFT AT SPOT. I BELIEVE I FOLLOWED THE CHKLISTS AND MANUALS AND THE FO DID A POSTFLT INSPECTION WITH NO ABNORMALITIES. I RECEIVED A PHONE CALL FROM A SAFETY COMMITTEE MEMBER ASKING ABOUT FLT AND THE ENG SHUTDOWN. I SAID I WAS SURPRISED AND EMBARRASSED IF IT WERE MY MISTAKE. I'M 99% SURE I SHUT IT DOWN CORRECTLY. AND THE FO NEVER MENTIONED IT WAS RUNNING. WE ALL LEFT THE PLANE AND COMMISSARY WAS LOADING DRINKS. I CHKED OUT; WENT TO CRASH PAD. IF THIS WAS MY MISTAKE; I AM SORRY AND GLAD NO ONE WAS HURT OR INJURED. THERE ARE A LOT OF FRIENDS AND CO-WORKERS I CARE ABOUT NEAR OUR/MY ENGS. THIS IS A LESSON LEARNED FOR ME EITHER WAY. WE JUST WENT OVER CHKLISTS USAGE IN GND SCHOOL EARLIER THIS MONTH. AND I BRIEFED THE FO ABOUT DILIGENT USAGE AND THE CLASS. I WILL TAKE EXTRA MEASURES TO BE DILIGENT AND PATIENT WITH FLOWS AND READ/DO CHKLIST PROCS; DOUBLECHK AND EVEN TRIPLECHK.

Data retrieved from NASA's ASRS site as of May 2009 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.