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An L1011 in cruise at FL290 hits some cloud tops and is forced upward about 500 ft from an updraft. Altitude deviation altitude excursion.
| Attributes | |
| ACN | 354430 |
| Time | |
| Date | 199611 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lin |
| State Reference | NV |
| Altitude | msl bound lower : 29000 msl bound upper : 29500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tower : eri |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011-1 100/200/250 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors enroute airway : j84 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | controller radar : 37 flight time last 90 days : 210 flight time total : 26500 flight time type : 3000 |
| ASRS Report | 354430 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
After leveloff at FL290 autoplt on, aircraft clipping tops of cloud layer and encountered updraft. Aircraft drifted up 400- 500 ft above FL290 before PF (first officer) could recover and return to FL290.
Original NASA ASRS Text
Title: AN L1011 IN CRUISE AT FL290 HITS SOME CLOUD TOPS AND IS FORCED UPWARD ABOUT 500 FT FROM AN UPDRAFT. ALTDEV ALT EXCURSION.
Narrative: AFTER LEVELOFF AT FL290 AUTOPLT ON, ACFT CLIPPING TOPS OF CLOUD LAYER AND ENCOUNTERED UPDRAFT. ACFT DRIFTED UP 400- 500 FT ABOVE FL290 BEFORE PF (FO) COULD RECOVER AND RETURN TO FL290.
Data retrieved from NASA's ASRS site as of July 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.