Air carrier medium large transport developed engine problem at cruise altitude. Checklist procedure corrected the problem but the flight crew elected to return for precautionary landing.

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Attributes
ACN	191000
Time
Date	199110
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pie
State Reference	FL
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma tracon : lax
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : j58
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp
Experience	flight time total : 16000
ASRS Report	191000
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 5700 flight time type : 2600
ASRS Report	190587
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After leveling off at FL310, #2 engine started surging and EPR, N1 and N2 started to decrease. Engine ignition was placed to override and engine gradually stabilized at normal power. Flight returned to tpa for precautionary landing. At no time did the engine completely fail. I felt returning to tpa was the best action as we did not know if engine would malfunction again. Supplemental information from acn 190587. Deviating around thunderstorms, en route to dfw in light/mod icing, light/mod turbulence. We proceeded with emergency procedures of ignition override. Engine relit and had normal cruise readings.

Original NASA ASRS Text

Title: ACR MLG DEVELOPED ENG PROBLEM AT CRUISE ALT. CHKLIST PROC CORRECTED THE PROBLEM BUT THE FLC ELECTED TO RETURN FOR PRECAUTIONARY LNDG.

Narrative: AFTER LEVELING OFF AT FL310, #2 ENG STARTED SURGING AND EPR, N1 AND N2 STARTED TO DECREASE. ENG IGNITION WAS PLACED TO OVERRIDE AND ENG GRADUALLY STABILIZED AT NORMAL PWR. FLT RETURNED TO TPA FOR PRECAUTIONARY LNDG. AT NO TIME DID THE ENG COMPLETELY FAIL. I FELT RETURNING TO TPA WAS THE BEST ACTION AS WE DID NOT KNOW IF ENG WOULD MALFUNCTION AGAIN. SUPPLEMENTAL INFO FROM ACN 190587. DEVIATING AROUND TSTMS, ENRTE TO DFW IN LIGHT/MOD ICING, LIGHT/MOD TURB. WE PROCEEDED WITH EMER PROCS OF IGNITION OVERRIDE. ENG RELIT AND HAD NORMAL CRUISE READINGS.

Data retrieved from NASA's ASRS site as of July 2007 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.