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Air carrier medium large transport encounters turbulence and updraft in cruise. 300' altitude excursion results.
| Attributes | |
| ACN | 145986 |
| Time | |
| Date | 199005 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : psk |
| State Reference | VA |
| Altitude | msl bound lower : 31000 msl bound upper : 31300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 126 flight time total : 5732 flight time type : 74 |
| ASRS Report | 145986 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During cruise with autoplt engaged, we heard several aircraft deviating for WX. Nothing was painting on our radar. We began to encounter turbulence accompanied with static discharge display. The engine anti-ice was selected after the ignitors were turned on. The aircraft began to climb and increase airspeed from .76 mach to .80 mach and subsequently the autoplt was disengaged. Aircraft was 300' off assigned altitude while I was trying to maintain constant attitude (altitude alert went off). Controller never queried us re: altitude. Flight landed in avl west/O further incident.
Original NASA ASRS Text
Title: ACR MLG ENCOUNTERS TURBULENCE AND UPDRAFT IN CRUISE. 300' ALT EXCURSION RESULTS.
Narrative: DURING CRUISE WITH AUTOPLT ENGAGED, WE HEARD SEVERAL ACFT DEVIATING FOR WX. NOTHING WAS PAINTING ON OUR RADAR. WE BEGAN TO ENCOUNTER TURB ACCOMPANIED WITH STATIC DISCHARGE DISPLAY. THE ENG ANTI-ICE WAS SELECTED AFTER THE IGNITORS WERE TURNED ON. THE ACFT BEGAN TO CLB AND INCREASE AIRSPD FROM .76 MACH TO .80 MACH AND SUBSEQUENTLY THE AUTOPLT WAS DISENGAGED. ACFT WAS 300' OFF ASSIGNED ALT WHILE I WAS TRYING TO MAINTAIN CONSTANT ATTITUDE (ALT ALERT WENT OFF). CTLR NEVER QUERIED US RE: ALT. FLT LANDED IN AVL W/O FURTHER INCIDENT.
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.