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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A B737-800 flight crew encounters turbulence while in cruise; airspeed decreases and stall shaker activated.
| Attributes | |
| ACN | 707290 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : fsd.vortac |
| State Reference | SD |
| Altitude | msl bound lower : 35000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 707290 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : pitch limit indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
In cruise at FL370 with FMC showing optimum approximately FL370; maximum approximately FL385. IMC in high cloud layer. WX radar showing some returns to sides of course and tops of returns below our altitude. Ride went from smooth to continuous light turbulence and then airspeed decreased. Selected maximum continuous thrust but unable to hold airspeed. Pitch limit indicator appeared in eadi. Obtained descent first to FL360 and then to FL350 from ZMP. Stick shaker activated momentarily during descent. Leveled off at FL350 and turbulence soon abated.
Original NASA ASRS Text
Title: A B737-800 FLT CREW ENCOUNTERS TURB WHILE IN CRUISE; AIRSPD DECREASES AND STALL SHAKER ACTIVATED.
Narrative: IN CRUISE AT FL370 WITH FMC SHOWING OPTIMUM APPROX FL370; MAX APPROX FL385. IMC IN HIGH CLOUD LAYER. WX RADAR SHOWING SOME RETURNS TO SIDES OF COURSE AND TOPS OF RETURNS BELOW OUR ALT. RIDE WENT FROM SMOOTH TO CONTINUOUS LIGHT TURB AND THEN AIRSPD DECREASED. SELECTED MAX CONTINUOUS THRUST BUT UNABLE TO HOLD AIRSPD. PITCH LIMIT INDICATOR APPEARED IN EADI. OBTAINED DSCNT FIRST TO FL360 AND THEN TO FL350 FROM ZMP. STICK SHAKER ACTIVATED MOMENTARILY DURING DSCNT. LEVELED OFF AT FL350 AND TURB SOON ABATED.
Data retrieved from NASA's ASRS site as of January 2009 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.