An A320 experienced a power loss at FL390. Conducted an emergency descent to 11000 ft where the engine operated normally. The crew landed at the nearest suitable airport.

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Attributes
ACN	632837
Time
Date	200410
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl bound lower : 11000 msl bound upper : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : cmh.tower
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 150
ASRS Report	632837
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : ecam
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff/climb from ZZZ1 to ZZZ2, we got an ECAM message for a faulty bleed valve on our #1 (left) engine. We followed air carrier procedures and closed the bleed valve switch. This may or may not have an effect on the following situation. Everything continued normally at our cruise altitude of FL390 for about 1 1/2 hours. Over abc while in light turbulence we noticed a very noticeable vibration and the #1 (left) engine rolled back to 40% N1 and was unresponsive to any thrust lever movement. We started to lose airspeed, declared an emergency and started a descent. At that time the #1 engine spiked toward yellow/red line, and the thrust lever was moved to idle. We leveled off at 11000 ft and found the #1 engine was running properly and continued on to ZZZ3 and made an uneventful landing.

Original NASA ASRS Text

Title: AN A320 EXPERIENCED A PWR LOSS AT FL390. CONDUCTED AN EMER DSCNT TO 11000 FT WHERE THE ENG OPERATED NORMALLY. THE CREW LANDED AT THE NEAREST SUITABLE ARPT.

Narrative: ON TKOF/CLB FROM ZZZ1 TO ZZZ2, WE GOT AN ECAM MESSAGE FOR A FAULTY BLEED VALVE ON OUR #1 (L) ENG. WE FOLLOWED ACR PROCS AND CLOSED THE BLEED VALVE SWITCH. THIS MAY OR MAY NOT HAVE AN EFFECT ON THE FOLLOWING SIT. EVERYTHING CONTINUED NORMALLY AT OUR CRUISE ALT OF FL390 FOR ABOUT 1 1/2 HRS. OVER ABC WHILE IN LIGHT TURB WE NOTICED A VERY NOTICEABLE VIBRATION AND THE #1 (L) ENG ROLLED BACK TO 40% N1 AND WAS UNRESPONSIVE TO ANY THRUST LEVER MOVEMENT. WE STARTED TO LOSE AIRSPD, DECLARED AN EMER AND STARTED A DSCNT. AT THAT TIME THE #1 ENG SPIKED TOWARD YELLOW/RED LINE, AND THE THRUST LEVER WAS MOVED TO IDLE. WE LEVELED OFF AT 11000 FT AND FOUND THE #1 ENG WAS RUNNING PROPERLY AND CONTINUED ON TO ZZZ3 AND MADE AN UNEVENTFUL LNDG.

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.