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A330 first officer reported moderate turbulence resulted in a speed reduction before making the request with ATC.
| Attributes | |
| ACN | 1617770 |
| Time | |
| Date | 201902 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A330 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Westbound on nat D (north atlantic track D) at assigned FL390 and assigned mach .82; we experienced moderate turbulence. We slowed from mach .82 to mach .80 to improve the ride. We notified gander via cpdlc(controller pilot datalink communications) of the change immediately; and received an acknowledgment shortly after via cpdlc. [A few minutes later]; the ride improved. We accelerated back to assigned mach .82; notified gander via cpdlc immediately and again received acknowledgment via cpdlc. Shortly after; we received a message via cpdlc; something to the effect of next time; make request prior to change. No further communication related to this scenario. Flight continued uneventfully to full stop landing.change in speed was effected to improve the ride in moderate turbulence. If ride and timing permits; notification to ATC should be made in advance of speed change.
Original NASA ASRS Text
Title: A330 First Officer reported moderate turbulence resulted in a speed reduction before making the request with ATC.
Narrative: Westbound on NAT D (North Atlantic Track D) at assigned FL390 and assigned mach .82; we experienced moderate turbulence. We slowed from mach .82 to mach .80 to improve the ride. We notified Gander via CPDLC(Controller Pilot Datalink Communications) of the change immediately; and received an acknowledgment shortly after via CPDLC. [A few minutes later]; the ride improved. We accelerated back to assigned mach .82; notified Gander via CPDLC immediately and again received acknowledgment via CPDLC. Shortly after; we received a message via CPDLC; something to the effect of Next time; make request prior to change. No further communication related to this scenario. Flight continued uneventfully to full stop landing.Change in speed was effected to improve the ride in moderate turbulence. If ride and timing permits; notification to ATC should be made in advance of speed change.
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.