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A330 first officer reported the flight crew chose to divert to an alternate airport after noticing abnormal uncommanded aileron movement.
| Attributes | |
| ACN | 1357579 |
| Time | |
| Date | 201605 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A330 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Aileron Control System |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown |
Narrative:
During climb and cruise we had what we thought was continuous light chop. The chop did not subside and it seemed to us that the aircraft's pulsating/bumping movement was too rhythmic; too steady to be turbulence. We had flown the aircraft 3 legs already with no anomalies. My first concern was the rudder as the movement had a fishtail quality to it. ECAM F/control (flight control) page indicated ops normal on the rudder. However; the captain noticed that the indicator (carrot) on the left outboard aileron was moving up and down rhythmically over a short range. The other seven aileron actuator indicators were near motionless. Flight control computers appeared normal; as did yellow and green hydraulics that powered the aileron.convinced that we had a bad left outboard actuator we opted to [advise ATC] and land before the unit degraded further. The pulsing stopped upon flap extension during approach and landing and taxi was uneventful.
Original NASA ASRS Text
Title: A330 First Officer reported the flight crew chose to divert to an alternate airport after noticing abnormal uncommanded aileron movement.
Narrative: During climb and cruise we had what we thought was continuous light chop. The chop did not subside and it seemed to us that the aircraft's pulsating/bumping movement was too rhythmic; too steady to be turbulence. We had flown the aircraft 3 legs already with no anomalies. My first concern was the rudder as the movement had a fishtail quality to it. ECAM F/CTL (flight control) page indicated ops normal on the rudder. However; the Captain noticed that the indicator (carrot) on the left outboard aileron was moving up and down rhythmically over a short range. The other seven aileron actuator indicators were near motionless. Flight control computers appeared normal; as did Yellow and Green hydraulics that powered the aileron.Convinced that we had a bad left outboard actuator we opted to [advise ATC] and land before the unit degraded further. The pulsing stopped upon flap extension during approach and landing and taxi was uneventful.
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.