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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An airbus encounters mountain wave conditions resulting in an overspd that is corrected by the autoflt system beginning a climb that the flight crew could not override. This resulted in a traffic alert because of traffic above.
| Attributes | |
| ACN | 526780 |
| Time | |
| Date | 200110 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : als.vortac |
| State Reference | CO |
| Altitude | msl bound lower : 37000 msl bound upper : 37500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 6000 flight time type : 400 |
| ASRS Report | 526780 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter other |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Weather Environmental Factor Aircraft |
| Primary Problem | Weather |
Narrative:
While at cruise FL370, aircraft encountered a strong mountain wave/updraft causing an aircraft overspd. The aircraft pitched up in respect of the protections provided under normal laws and could not be overridden by the flight crew. A 500 ft gain in altitude resulted and a TA caused by another aircraft overhead. Once the airspeed reduced, control of the aircraft was taken back manually and the altitude restored.
Original NASA ASRS Text
Title: AN AIRBUS ENCOUNTERS MOUNTAIN WAVE CONDITIONS RESULTING IN AN OVERSPD THAT IS CORRECTED BY THE AUTOFLT SYS BEGINNING A CLB THAT THE FLT CREW COULD NOT OVERRIDE. THIS RESULTED IN A TFC ALERT BECAUSE OF TFC ABOVE.
Narrative: WHILE AT CRUISE FL370, ACFT ENCOUNTERED A STRONG MOUNTAIN WAVE/UPDRAFT CAUSING AN ACFT OVERSPD. THE ACFT PITCHED UP IN RESPECT OF THE PROTECTIONS PROVIDED UNDER NORMAL LAWS AND COULD NOT BE OVERRIDDEN BY THE FLT CREW. A 500 FT GAIN IN ALT RESULTED AND A TA CAUSED BY ANOTHER ACFT OVERHEAD. ONCE THE AIRSPD REDUCED, CTL OF THE ACFT WAS TAKEN BACK MANUALLY AND THE ALT RESTORED.
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.