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A g-iv flight crew reported a severe turbulence encounter descending through FL280 that resulted in loss of vertical path control and an involuntary descent to FL200.
| Attributes | |
| ACN | 991204 |
| Time | |
| Date | 201201 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZID.ARTCC |
| State Reference | IN |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Gulfstream IV / G350 / G450 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 45 Flight Crew Total 7000 Flight Crew Type 1200 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 80 Flight Crew Total 12500 Flight Crew Type 1010 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
While descending through FL280 for FL260 the aircraft encountered severe turbulence. We were unable to maintain altitude and during an uncontrolled descent we were instructed by center to maintain FL240. The aircraft was finally recovered from the descent at FL200. We notified ATC of our altitude and were instructed to maintain FL220. We were able to climb and maintain FL220. At this point the deviation was complete. I don't believe at any point did we have a conflict with other traffic.
Original NASA ASRS Text
Title: A G-IV flight crew reported a severe turbulence encounter descending through FL280 that resulted in loss of vertical path control and an involuntary descent to FL200.
Narrative: While descending through FL280 for FL260 the aircraft encountered severe turbulence. We were unable to maintain altitude and during an uncontrolled descent we were instructed by Center to maintain FL240. The aircraft was finally recovered from the descent at FL200. We notified ATC of our altitude and were instructed to maintain FL220. We were able to climb and maintain FL220. At this point the deviation was complete. I don't believe at any point did we have a conflict with other traffic.
Data retrieved from NASA's ASRS site as of July 2013 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.