Narrative:

Shortly after passing bumat at FL350 on B337; magadan ATC gave us a PIREP of volcanic ash ahead near our intended course. Volcanic ash (va) was reported at goras FL350-400. Max altitude capability was FL395. We requested reroute deviation direct oskon A218 lurog G7 ogeto G902 then as filed. Was immediately cleared direct oskon; then ATC asked if we would prefer direct lurog direct frenk. We accepted magadan's suggestion for reroute. There were no indications of va penetration observed inside or outside of aircraft. Engine indications appeared normal. We advised dispatch. ATC had us radar contact entire time. Dispatch should be more closely monitoring our flight path since they dispatched us into a known area with volcanic activity. Reports received after we queried dispatch in flight included verified satellite imagery indicating presence of the ash plume. Upon notification by magadan control we did not visually confirm indication of the plume because of time of day (twilight) and lack of sufficient light. However; our flight was planned downwind of the eruption with the ash plume forecast to be along the route by the time we passed. I believe we should have been flight planned upwind of the known volcanic activity.at the very least; we should have been informed by dispatch proactively inflight of the satellite imagery showing the plume progressing along our route as a possible hazard to avoid -- dispatch has all the tools available to monitor such information. Fortunately the magadan controller volunteered the information to the crew in time to make course changes to avoid the ash plume.

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Original NASA ASRS Text

Title: B777 flight crew is informed by ATC of a volcanic ash plume ahead that will require deviation to miss and the crew accepts a revised route. This particular volcanic ash plume had not been part of the Dispatch Release and the crew only became aware when informed by Magadan Control.

Narrative: Shortly after passing BUMAT at FL350 on B337; Magadan ATC gave us a PIREP of Volcanic Ash ahead near our intended course. Volcanic ash (VA) was reported at GORAS FL350-400. Max altitude capability was FL395. We requested reroute deviation direct OSKON A218 LUROG G7 OGETO G902 then as filed. Was immediately cleared direct OSKON; then ATC asked if we would prefer direct LUROG direct FRENK. We accepted Magadan's suggestion for reroute. There were no indications of VA penetration observed inside or outside of aircraft. Engine indications appeared normal. We advised dispatch. ATC had us radar contact entire time. Dispatch should be more closely monitoring our flight path since they dispatched us into a known area with volcanic activity. Reports received after we queried dispatch in flight included verified satellite imagery indicating presence of the ash plume. Upon notification by Magadan Control we did not visually confirm indication of the plume because of time of day (twilight) and lack of sufficient light. However; our flight was planned downwind of the eruption with the ash plume forecast to be along the route by the time we passed. I believe we should have been flight planned UPWIND of the known volcanic activity.At the very least; we should have been informed by dispatch proactively inflight of the satellite imagery showing the plume progressing along our route as a possible hazard to avoid -- dispatch has all the tools available to monitor such information. Fortunately the Magadan controller volunteered the information to the crew in time to make course changes to avoid the ash plume.

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.