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Air carrier has turbulence at cruise, requests higher, then lower. More turbulence, altitude deviation.
| Attributes | |
| ACN | 203347 |
| Time | |
| Date | 199202 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : hmv |
| State Reference | NC |
| Altitude | msl bound lower : 23500 msl bound upper : 24500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 185 flight time total : 14800 flight time type : 415 |
| ASRS Report | 203347 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 220 flight time total : 6000 flight time type : 847 |
| ASRS Report | 203093 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
Aircraft was at FL280 (flight plan altitude). Large transport-mdt turbulence was encountered during climb and at FL280. The seat belt sign was on and everyone was reminded to remain seated. A turbulence report was requested from ATC, and they reported smooth air below FL230 and above FL330. FL350 was requested. Large transport-mdt turbulence was also encountered at FL350. An altitude below FL230 was requested. Clearance to FL240 was issued. During descent severe turbulence was encountered at FL260. At FL240, altdevs of +/- 500 ft were experienced. Level flight could not be maintained. An immediate descent was requested and received. The aircraft was descended to FL220 where the ride was nearly smooth. There were no injuries or apparent damage. The duration of the turbulence was 30-45 seconds. The en route winds shown on the flight plan at FL330 were 260 degree/138. FMS winds were 260 degrees/1272. At FL250, winds were less than 90 KTS. Other aircraft in the area were reporting mdt turbulence.
Original NASA ASRS Text
Title: ACR HAS TURB AT CRUISE, REQUESTS HIGHER, THEN LOWER. MORE TURB, ALTDEV.
Narrative: ACFT WAS AT FL280 (FLT PLAN ALT). LGT-MDT TURB WAS ENCOUNTERED DURING CLB AND AT FL280. THE SEAT BELT SIGN WAS ON AND EVERYONE WAS REMINDED TO REMAIN SEATED. A TURB RPT WAS REQUESTED FROM ATC, AND THEY RPTED SMOOTH AIR BELOW FL230 AND ABOVE FL330. FL350 WAS REQUESTED. LGT-MDT TURB WAS ALSO ENCOUNTERED AT FL350. AN ALT BELOW FL230 WAS REQUESTED. CLRNC TO FL240 WAS ISSUED. DURING DSCNT SEVERE TURB WAS ENCOUNTERED AT FL260. AT FL240, ALTDEVS OF +/- 500 FT WERE EXPERIENCED. LEVEL FLT COULD NOT BE MAINTAINED. AN IMMEDIATE DSCNT WAS REQUESTED AND RECEIVED. THE ACFT WAS DSNDED TO FL220 WHERE THE RIDE WAS NEARLY SMOOTH. THERE WERE NO INJURIES OR APPARENT DAMAGE. THE DURATION OF THE TURB WAS 30-45 SECONDS. THE ENRTE WINDS SHOWN ON THE FLT PLAN AT FL330 WERE 260 DEG/138. FMS WINDS WERE 260 DEGS/1272. AT FL250, WINDS WERE LESS THAN 90 KTS. OTHER ACFT IN THE AREA WERE RPTING MDT TURB.
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.