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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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After entering a climb at normal cruise mach, MD80 flight crew encountered WX at FL340 with strong updrafts and moderate rain and chop. Rapid loss of airspeed ensued and climb was terminated after full power failed to terminate stick shaker and buffet. Flight crew descended to regain airspeed.
| Attributes | |
| ACN | 412144 |
| Time | |
| Date | 199808 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : fsd |
| State Reference | SD |
| Altitude | msl bound lower : 31000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 412144 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter : weather other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : regained aircraft control other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
A line of WX extended from sydney, northeast, to duluth, mn, with a hole along a line from fsd to dpr which other aircraft were getting through without complaints. Another aircraft at FL350 just passed through ahead of us and reported a smooth ride. We requested and received a block FL330 to FL350. We entered the hole at FL340. The WX was closing in quickly. Upon entering the WX at normal cruise mach, we encountered a strong updraft with moderate rain and chop. Aircraft started to climb with a rapid loss of airspeed down to stickshaker without a change in pitch attitude. Autoplt/autothrottle were disconnected and full power was applied. Stickshaker was accompanied with buffet. Climb was stopped at FL350 and a lower altitude was requested. We were then cleared any altitude. We descended to FL310 to regain airspeed. Entire event lasted approximately 90 seconds. Seatbelt sign was on. Flight attendant and passenger were seated. No injuries or aircraft damage.
Original NASA ASRS Text
Title: AFTER ENTERING A CLB AT NORMAL CRUISE MACH, MD80 FLT CREW ENCOUNTERED WX AT FL340 WITH STRONG UPDRAFTS AND MODERATE RAIN AND CHOP. RAPID LOSS OF AIRSPD ENSUED AND CLB WAS TERMINATED AFTER FULL PWR FAILED TO TERMINATE STICK SHAKER AND BUFFET. FLT CREW DSNDED TO REGAIN AIRSPD.
Narrative: A LINE OF WX EXTENDED FROM SYDNEY, NE, TO DULUTH, MN, WITH A HOLE ALONG A LINE FROM FSD TO DPR WHICH OTHER ACFT WERE GETTING THROUGH WITHOUT COMPLAINTS. ANOTHER ACFT AT FL350 JUST PASSED THROUGH AHEAD OF US AND RPTED A SMOOTH RIDE. WE REQUESTED AND RECEIVED A BLOCK FL330 TO FL350. WE ENTERED THE HOLE AT FL340. THE WX WAS CLOSING IN QUICKLY. UPON ENTERING THE WX AT NORMAL CRUISE MACH, WE ENCOUNTERED A STRONG UPDRAFT WITH MODERATE RAIN AND CHOP. ACFT STARTED TO CLB WITH A RAPID LOSS OF AIRSPD DOWN TO STICKSHAKER WITHOUT A CHANGE IN PITCH ATTITUDE. AUTOPLT/AUTOTHROTTLE WERE DISCONNECTED AND FULL PWR WAS APPLIED. STICKSHAKER WAS ACCOMPANIED WITH BUFFET. CLB WAS STOPPED AT FL350 AND A LOWER ALT WAS REQUESTED. WE WERE THEN CLRED ANY ALT. WE DSNDED TO FL310 TO REGAIN AIRSPD. ENTIRE EVENT LASTED APPROX 90 SECONDS. SEATBELT SIGN WAS ON. FLT ATTENDANT AND PAX WERE SEATED. NO INJURIES OR ACFT DAMAGE.
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.