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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier B737-200 was unable to maintain its assigned altitude due to WX factors thunderstorms, turbulence, roll clouds, etc. The crew then deviated further from their altitude when an altitude change was not immediately forthcoming.
| Attributes | |
| ACN | 337309 |
| Time | |
| Date | 199605 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ctf airport : clt |
| State Reference | SC |
| Altitude | msl bound lower : 9000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 8500 flight time type : 3200 |
| ASRS Report | 337309 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 11000 flight time type : 6500 |
| ASRS Report | 336310 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
We were getting moderate turbulence at 11000 ft, asked for lower twice. Entered downdraft. Autoplt was engaged. Aircraft pitched over, descended 300 ft. Again asked for lower and disengaged autoplt to relevel. Broke out with roll clouds in our 12 O'clock. Stated to ATC that we were descending. At 10500 ft we were given clearance to 9000 ft.
Original NASA ASRS Text
Title: AN ACR B737-200 WAS UNABLE TO MAINTAIN ITS ASSIGNED ALT DUE TO WX FACTORS TSTMS, TURB, ROLL CLOUDS, ETC. THE CREW THEN DEVIATED FURTHER FROM THEIR ALT WHEN AN ALT CHANGE WAS NOT IMMEDIATELY FORTHCOMING.
Narrative: WE WERE GETTING MODERATE TURB AT 11000 FT, ASKED FOR LOWER TWICE. ENTERED DOWNDRAFT. AUTOPLT WAS ENGAGED. ACFT PITCHED OVER, DSNDED 300 FT. AGAIN ASKED FOR LOWER AND DISENGAGED AUTOPLT TO RELEVEL. BROKE OUT WITH ROLL CLOUDS IN OUR 12 O'CLOCK. STATED TO ATC THAT WE WERE DSNDING. AT 10500 FT WE WERE GIVEN CLRNC TO 9000 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.