Narrative:

At FL360 in cruise flight we heard and felt a loud bang. Although no system lights had illuminated the left engine began to lose power and its egt began to rise. Flight attendants called and reported sparks coming from the left engine. We chose to shut the engine down and declare an emergency. We diverted to a nearby airport where the landing was uneventful.

Google
 

Original NASA ASRS Text

Title: Following a loud bang and sparks emitted from the left engine the flight crew of a B737 shut it down; declared an emergency and diverted to the nearest suitable airport.

Narrative: At FL360 in cruise flight we heard and felt a loud bang. Although no system lights had illuminated the left engine began to lose power and its EGT began to rise. Flight attendants called and reported sparks coming from the left engine. We chose to shut the engine down and declare an emergency. We diverted to a nearby airport where the landing was uneventful.

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.