A320 captain reported 2 instances of un-commanded rudder movement while in cruise flight.

Attributes
ACN	1696569
Time
Date	201910
Local Time Of Day	1201-1800
Place
Locale Reference	MMFR.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Rudder
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 139 Flight Crew Total 1267 Flight Crew Type 1267
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

While at cruise flight FL330; smooth air; autopilot on; we experienced a momentary un-commanded rudder movement resulting in yaw to the right. Autopilot remained engaged and we got no ECAM; master caution or warning. We discussed this as being highly unusual but felt that we could have hit some wake vortices. The flight resumed normally for approximately 2 hours when we got a second rudder movement shortly before we left cruise altitude. At this point we knew something was not right. At that time we decided to report the condition to maintenance. Both occurrences were brief; lasting no longer than 1 second.during both movements; the autopilot remained engaged and we got no ECAM messages; cautions or warnings. The aircraft remained in full control at all times and maintained normal flight profile. For this reason; ATC was not advised.

Original NASA ASRS Text

Title: A320 Captain reported 2 instances of un-commanded rudder movement while in cruise flight.

Narrative: While at cruise flight FL330; smooth air; autopilot on; we experienced a momentary un-commanded rudder movement resulting in yaw to the right. Autopilot remained engaged and we got no ECAM; master caution or warning. We discussed this as being highly unusual but felt that we could have hit some wake vortices. The flight resumed normally for approximately 2 hours when we got a second rudder movement shortly before we left cruise altitude. At this point we knew something was not right. At that time we decided to report the condition to maintenance. Both occurrences were brief; lasting no longer than 1 second.During both movements; the autopilot remained engaged and we got no ECAM messages; cautions or warnings. The aircraft remained in full control at all times and maintained normal flight profile. For this reason; ATC was not advised.

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.