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A320 captain reported a momentary slat overspeed resulted during clean-up after a wake turbulence encounter. A slat channel MEL; which causes the slats to retract slower; was cited as contributing factor.
| Attributes | |
| ACN | 1480586 |
| Time | |
| Date | 201709 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | PHX.Airport |
| State Reference | AZ |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Speed All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
We had [a slat channel] MEL. During clean up and acceleration; the slats were slower than normal to retract. We hit wake turbulence from the aircraft in front of us causing a momentary exceedance of the max flap/slat speed while the slats were still retracting. The event lasted 2 or 3 seconds. Normally the slats retract quicker than with this MEL. Company policy is to retract slats and flaps and accelerate to 250 KIAS. There was no caution in the MEL information concerning the risk of potential overspeed. Also the wake turbulence we encountered added airspeed rapidly assisting in the speed exceeding maximum for configuration.a note of caution in the MEL notes would have been very helpful.
Original NASA ASRS Text
Title: A320 Captain reported a momentary slat overspeed resulted during clean-up after a wake turbulence encounter. A slat channel MEL; which causes the slats to retract slower; was cited as contributing factor.
Narrative: We had [a Slat Channel] MEL. During clean up and acceleration; the slats were slower than normal to retract. We hit wake turbulence from the aircraft in front of us causing a momentary exceedance of the max flap/slat speed while the slats were still retracting. The event lasted 2 or 3 seconds. Normally the slats retract quicker than with this MEL. Company policy is to retract slats and flaps and accelerate to 250 KIAS. There was no caution in the MEL information concerning the risk of potential overspeed. Also the wake turbulence we encountered added airspeed rapidly assisting in the speed exceeding maximum for configuration.A note of caution in the MEL notes would have been very helpful.
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.