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Air carrier aircraft has upset due to high altitude and turbulence induced by area of thunderstorms. Emergency change of altitude without initial ATC clearance.
| Attributes | |
| ACN | 113742 |
| Time | |
| Date | 198906 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pxv |
| State Reference | IN |
| Altitude | msl bound lower : 37000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6000 |
| ASRS Report | 113742 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 114239 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : regained aircraft control flight crew : declared emergency none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
At FL390 while diverting around thunderstorms, experienced severe turbulence in cirrus clouds. Unable to maintain altitude (aircraft climbed then descended). We reported out of FL390 descending and were recleared to FL370. Turbulence lasted only about 30 seconds.
Original NASA ASRS Text
Title: ACR ACFT HAS UPSET DUE TO HIGH ALT AND TURBULENCE INDUCED BY AREA OF TSTMS. EMERGENCY CHANGE OF ALT WITHOUT INITIAL ATC CLRNC.
Narrative: AT FL390 WHILE DIVERTING AROUND TSTMS, EXPERIENCED SEVERE TURB IN CIRRUS CLOUDS. UNABLE TO MAINTAIN ALT (ACFT CLIMBED THEN DESCENDED). WE REPORTED OUT OF FL390 DESCENDING AND WERE RECLEARED TO FL370. TURB LASTED ONLY ABOUT 30 SECONDS.
Data retrieved from NASA's ASRS site as of August 2007 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.