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B747-400 flight crew reported a strong updraft in oceanic airspace that caused a gain of 300 feet in altitude.
| Attributes | |
| ACN | 1461847 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 91 Flight Crew Total 15600 Flight Crew Type 5500 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 14500 Flight Crew Type 4200 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Weather / Turbulence |
Narrative:
Aircraft was in IMC conditions; just in the tops of a layer we were in at 39;000. Weather radar showed very weak; low intensity very widely scattered small returns approximately 40 NM north of our position. Without warning we were in heavy precipitation; then very pronounced turbulence; and a strong updraft that carried the aircraft very rapidly 300+ feet above our assigned altitude. Objects in the cockpit floated off the surface they were laying on; and I was hanging in my seatbelt as the autopilot returned rapidly to the assigned altitude. Encounter was reported to ATC and company dispatch. Aircraft and crew were safe and undamaged after the encounter. Ops normal the rest of the flight.
Original NASA ASRS Text
Title: B747-400 flight crew reported a strong updraft in oceanic airspace that caused a gain of 300 feet in altitude.
Narrative: Aircraft was in IMC conditions; just in the tops of a layer we were in at 39;000. Weather radar showed very weak; low intensity very widely scattered small returns approximately 40 NM north of our position. Without warning we were in heavy precipitation; then very pronounced turbulence; and a strong updraft that carried the aircraft very rapidly 300+ feet above our assigned altitude. Objects in the cockpit floated off the surface they were laying on; and I was hanging in my seatbelt as the autopilot returned rapidly to the assigned altitude. Encounter was reported to ATC and company dispatch. Aircraft and crew were safe and undamaged after the encounter. Ops normal the rest of the flight.
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.