Md-83 flight crew reported left engine rolled back in cruise flight at FL310 with engine and airfoil...

Attributes
ACN	981703
Time
Date	201111
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

FL310 inbound to [to destination] we noticed the left engine rollback (power decreasing; egt increasing; thrust levers aligned; with engine anti-ice; airfoil anti-ice; and ignition on for approximately 10 minutes prior to the event.) the engine was unresponsive. Declared emergency and departed FL310 after receiving ATC clearance to descend to FL240. As we were about to perform the checklist; the engine power and parameters came back to normal and remained normal for the balance of the flight. The emergency was canceled and the remainder of the flight was uneventful to a normal approach and landing. No further problems were noted on that engine.

Original NASA ASRS Text

Title: MD-83 flight crew reported left engine rolled back in cruise flight at FL310 with engine and airfoil anti-ice on. They declared an emergency and descended to FL240; where the engine spontaneously resumed normal operation.

Narrative: FL310 inbound to [to destination] we noticed the left engine rollback (power decreasing; EGT increasing; thrust levers aligned; with engine anti-ice; airfoil anti-ice; and ignition on for approximately 10 minutes prior to the event.) The engine was unresponsive. Declared emergency and departed FL310 after receiving ATC clearance to descend to FL240. As we were about to perform the checklist; the engine power and parameters came back to normal and remained normal for the balance of the flight. The emergency was canceled and the remainder of the flight was uneventful to a normal approach and landing. No further problems were noted on that engine.

Data retrieved from NASA's ASRS site as of April 2012 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.

Md-83 flight crew reported left engine rolled back in cruise flight at FL310 with engine and airfoil anti-ice on. They declared an emergency and descended to FL240; where the engine spontaneously resumed normal operation.