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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier aircraft loses 300 ft in altitude when unexpected turbulence creates a temporary loss of aircraft control. The crew flies back to assigned altitude without ATC notification.
| Attributes | |
| ACN | 429990 |
| Time | |
| Date | 199903 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | CO |
| Altitude | msl bound lower : 16700 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : larks 1 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 70 flight time total : 9100 flight time type : 5000 |
| ASRS Report | 429990 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 35 flight time total : 5000 flight time type : 175 |
| ASRS Report | 430764 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Lost 300 ft when experiencing moderate turbulence in clouds at 17000 ft MSL. Immediately climbed back to 17000 ft from 16700 ft.
Original NASA ASRS Text
Title: AN ACR ACFT LOSES 300 FT IN ALT WHEN UNEXPECTED TURB CREATES A TEMPORARY LOSS OF ACFT CTL. THE CREW FLIES BACK TO ASSIGNED ALT WITHOUT ATC NOTIFICATION.
Narrative: LOST 300 FT WHEN EXPERIENCING MODERATE TURB IN CLOUDS AT 17000 FT MSL. IMMEDIATELY CLBED BACK TO 17000 FT FROM 16700 FT.
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.