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B737-800 flight crew reported they encountered a severe mountain wave event causing injuries to three flight attendants.
| Attributes | |
| ACN | 1408093 |
| Time | |
| Date | 201612 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 22000 |
| Person 2 | |
| Function | Flight Service Enroute |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 6 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Weather / Turbulence |
Narrative:
At FL300; [we] encountered a severe mountain wave event with moderate turbulence. Autopilot was engaged at the time and remained engaged throughout event. For 90 seconds we had upward and downward movements in the wave with altitude deviations from FL295 to FL304. ATC was notified of deviation and aircraft returned to assigned FL300 without further deviations. Three flight attendants were injured and taken to a hospital [at our destination]. One passenger was injured and taken to a hospital.event occurred due to front range mountain wave. We were in clear air with continuous light chop at the time of the event. No other pilots had reported this severity of wave. Sigmets had reported light wave activity; but no reports of anything worse. After this 90 second event no other wave activity encountered.this event was unavoidable and unforeseen.
Original NASA ASRS Text
Title: B737-800 flight crew reported they encountered a severe mountain wave event causing injuries to three flight attendants.
Narrative: At FL300; [we] encountered a severe mountain wave event with moderate turbulence. Autopilot was engaged at the time and remained engaged throughout event. For 90 seconds we had upward and downward movements in the wave with altitude deviations from FL295 to FL304. ATC was notified of deviation and aircraft returned to assigned FL300 without further deviations. Three flight attendants were injured and taken to a hospital [at our destination]. One passenger was injured and taken to a hospital.Event occurred due to front range mountain wave. We were in clear air with continuous light chop at the time of the event. No other pilots had reported this severity of wave. SIGMETs had reported light wave activity; but no reports of anything worse. After this 90 second event no other wave activity encountered.This event was unavoidable and unforeseen.
Data retrieved from NASA's ASRS site 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.