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An A320 flight crew experiences a temporary loss of aircraft control with bank angles into the 45 degree mark, 15 mi west of dsm, ia.
| Attributes | |
| ACN | 509081 |
| Time | |
| Date | 200104 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dsm.airport |
| State Reference | IA |
| Altitude | msl single value : 35000 |
| Environment | |
| Weather Elements | Windshear Turbulence |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc tower : stl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 378 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : turbulence other anomaly other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : exited adverse environment |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor Aircraft Weather |
| Primary Problem | Weather |
Narrative:
After reaching FL350, the first officer welcomed passenger aboard giving lax WX, time of arrival, and the importance of observing the fasten seatbelt sign. During the first hour of cruise, the seatbelt sign was turned on several times due to moderate chop. The turbulence between bdf and dsm was continuous light with no reports of moderate. 15 mi west of dsm, we encountered severe turbulence. The aircraft rolled left to right, right to left several times reaching bank angles of 45 degrees and returning to level flight within 5-15 seconds. Airspeed fluctuated +/-15 KTS. No noticeable g-forces or altdevs were noticed.
Original NASA ASRS Text
Title: AN A320 FLC EXPERIENCES A TEMPORARY LOSS OF ACFT CTL WITH BANK ANGLES INTO THE 45 DEG MARK, 15 MI W OF DSM, IA.
Narrative: AFTER REACHING FL350, THE FO WELCOMED PAX ABOARD GIVING LAX WX, TIME OF ARR, AND THE IMPORTANCE OF OBSERVING THE FASTEN SEATBELT SIGN. DURING THE FIRST HR OF CRUISE, THE SEATBELT SIGN WAS TURNED ON SEVERAL TIMES DUE TO MODERATE CHOP. THE TURB BTWN BDF AND DSM WAS CONTINUOUS LIGHT WITH NO RPTS OF MODERATE. 15 MI W OF DSM, WE ENCOUNTERED SEVERE TURB. THE ACFT ROLLED L TO R, R TO L SEVERAL TIMES REACHING BANK ANGLES OF 45 DEGS AND RETURNING TO LEVEL FLT WITHIN 5-15 SECONDS. AIRSPD FLUCTUATED +/-15 KTS. NO NOTICEABLE G-FORCES OR ALTDEVS WERE NOTICED.
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.