An A320's autothrottle transitioned to thrust lock followed by the number one engine spooling back. ...

Attributes
ACN	1020890
Time
Date	201207
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Autothrottle/Speed Control
Person 1
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 11000 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Narrative:

We were on the arrival into our filed destination and had just finished deviating around a few thunderstorms. All of the sudden we got an ECAM that the autothrottles turned off and we got an ECAM that the autothrottles were in thrust lock. Then the number 1 engine suddenly rolled back to idle thrust while the number 2 engine remained at normal thrust. We declared an emergency letting ATC know we were experiencing and engine failure and we would get back to them. Within one minute later; we were able to regain normal control of the number 1 engine; but not the autothrust. We rescinded the emergency with ATC and continued the flight to ZZZ1 without the autothrust. The rest of the flight was uneventful.

Original NASA ASRS Text

Title: An A320's autothrottle transitioned to THRUST LOCK followed by the number one engine spooling back. The crew declared an emergency; but the engine returned to normal operation with no autothrottles.

Narrative: We were on the arrival into our filed destination and had just finished deviating around a few thunderstorms. All of the sudden we got an ECAM that the autothrottles turned OFF and we got an ECAM that the autothrottles were in thrust lock. Then the Number 1 engine suddenly rolled back to idle thrust while the Number 2 engine remained at normal thrust. We declared an emergency letting ATC know we were experiencing and engine failure and we would get back to them. Within one minute later; we were able to regain normal control of the Number 1 engine; but not the autothrust. We rescinded the emergency with ATC and continued the flight to ZZZ1 without the autothrust. The rest of the flight was uneventful.

Data retrieved from NASA's ASRS site as of July 2013 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.

An A320's autothrottle transitioned to thrust lock followed by the number one engine spooling back. The crew declared an emergency; but the engine returned to normal operation with no autothrottles.