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An A320 crew, in cruise at FL370, encountered mountain wave activity causing airspeed deviations of +15 KTS to -20 KTS.
| Attributes | |
| ACN | 537313 |
| Time | |
| Date | 200202 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : cys.vortac |
| State Reference | WY |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence other |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tower : anc.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 |
| ASRS Report | 537313 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence inflight encounter other other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
At 36 mi nne of cys, at FL370, encountered a mountain wave that put us 6 KTS into the overspd zone of aircraft for approximately 2-3 seconds. Airspeed went from +15 KTS to -20 KTS. Autoplt disconnected and autothrust taken off after 2-3 seconds of overspd. Operations returned to normal with minor speed fluctuations. Seatbelt sign was already on and flight attendants were seated.
Original NASA ASRS Text
Title: AN A320 CREW, IN CRUISE AT FL370, ENCOUNTERED MOUNTAIN WAVE ACTIVITY CAUSING AIRSPD DEVS OF +15 KTS TO -20 KTS.
Narrative: AT 36 MI NNE OF CYS, AT FL370, ENCOUNTERED A MOUNTAIN WAVE THAT PUT US 6 KTS INTO THE OVERSPD ZONE OF ACFT FOR APPROX 2-3 SECONDS. AIRSPD WENT FROM +15 KTS TO -20 KTS. AUTOPLT DISCONNECTED AND AUTOTHRUST TAKEN OFF AFTER 2-3 SECONDS OF OVERSPD. OPS RETURNED TO NORMAL WITH MINOR SPD FLUCTUATIONS. SEATBELT SIGN WAS ALREADY ON AND FLT ATTENDANTS WERE SEATED.
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.