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A B737-ng encountered a high altitude windshear in the southeastern cascade mountain range which caused the loss of 45 KTS at FL370. The captain exercised his emergency authority and began a descent to FL350 with maximum continuous thrust.
| Attributes | |
| ACN | 998861 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZSE.ARTCC |
| State Reference | WA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence |
Narrative:
Rapidly lost 45 KTS at FL370. The maximum continuous thrust was set at the onset of the shear. We descended to FL350 to stop the speed degradation and restore airspeed. The non-flying pilot advised ATC immediately and got acknowledgment after the third transmission. There was no conflicting traffic and the ride was smooth. No turbulence.
Original NASA ASRS Text
Title: A B737-NG encountered a high altitude windshear in the southeastern Cascade Mountain Range which caused the loss of 45 KTS at FL370. The Captain exercised his emergency authority and began a descent to FL350 with maximum continuous thrust.
Narrative: Rapidly lost 45 KTS at FL370. The maximum continuous thrust was set at the onset of the shear. We descended to FL350 to stop the speed degradation and restore airspeed. The non-flying pilot advised ATC immediately and got acknowledgment after the third transmission. There was no conflicting traffic and the ride was smooth. No turbulence.
Data retrieved from NASA's ASRS site as of July 2013 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.