 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A320 flight crew reported moderate to severe mountain wave over the sierra nevada mountain range which caused an overspeed.
| Attributes | |
| ACN | 1434887 |
| Time | |
| Date | 201703 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZOA.ARTCC |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 11624 Flight Crew Type 4970 |
| Person 2 | |
| Function | First Officer Pilot Not Flying Flight Engineer / Second Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 893 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
At FL340; aircraft encountered moderate to severe mountain wave which brought the aircraft unexpectedly to gaining about 12 knots airspeed within seconds of the encounter which brought the aircraft five knots into the red region on the speed tape. Recovered the aircraft by turning off the autopilot; increased altitude 120 feet high and throttles to idle. Brought the aircraft back to FL340 and placed automation of aircraft back on line. Received a call from the back stating that the two flight attendants fell to the floor (not in their seats) and a customer sat down on the floor while not in her seat either. After the flight; the flight attendants said they were alright; but asked them to file a report. Wrote up the aircraft overspeed and notified maintenance.
Original NASA ASRS Text
Title: A320 flight crew reported moderate to severe mountain wave over the Sierra Nevada mountain range which caused an overspeed.
Narrative: At FL340; aircraft encountered moderate to severe mountain wave which brought the aircraft unexpectedly to gaining about 12 knots airspeed within seconds of the encounter which brought the aircraft five knots into the red region on the speed tape. Recovered the aircraft by turning off the autopilot; increased altitude 120 feet high and throttles to idle. Brought the aircraft back to FL340 and placed automation of aircraft back on line. Received a call from the back stating that the two flight attendants fell to the floor (not in their seats) and a customer sat down on the floor while not in her seat either. After the flight; the flight attendants said they were alright; but asked them to file a report. Wrote up the aircraft overspeed and notified maintenance.
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.