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B777 flight crew encounters mountain wave activity and the aircraft exceeds the airframe maximum allowable airspeed (vne).
| Attributes | |
| ACN | 575217 |
| Time | |
| Date | 200303 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | navaid : hct.vortac |
| State Reference | NE |
| Altitude | msl single value : 3900 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tracon : mci.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 2000 |
| ASRS Report | 575217 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 17000 flight time type : 1600 |
| ASRS Report | 575218 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : overspeed warning other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Aircraft Weather |
| Primary Problem | Aircraft |
Narrative:
At FL390, M.85, due to be over target flight time. Mostly smooth with occasional light chop. Encountered light mountain wave effect. Speed increased towards redline, but manually retarded autothrottle, just keeping it below redline. Mins later, speed jumped again. This time unable to keep speed from exceeding redline. Reached .872 mach/273 KIAS. Overspd lasted less than 2 seconds. It was smooth the entire time. No other indications. Overspd written up in logbook. Captain was not in cockpit. Was in lavatory at the time.
Original NASA ASRS Text
Title: B777 FLC ENCOUNTERS MOUNTAIN WAVE ACTIVITY AND THE ACFT EXCEEDS THE AIRFRAME MAX ALLOWABLE AIRSPD (VNE).
Narrative: AT FL390, M.85, DUE TO BE OVER TARGET FLT TIME. MOSTLY SMOOTH WITH OCCASIONAL LIGHT CHOP. ENCOUNTERED LIGHT MOUNTAIN WAVE EFFECT. SPD INCREASED TOWARDS REDLINE, BUT MANUALLY RETARDED AUTOTHROTTLE, JUST KEEPING IT BELOW REDLINE. MINS LATER, SPD JUMPED AGAIN. THIS TIME UNABLE TO KEEP SPD FROM EXCEEDING REDLINE. REACHED .872 MACH/273 KIAS. OVERSPD LASTED LESS THAN 2 SECONDS. IT WAS SMOOTH THE ENTIRE TIME. NO OTHER INDICATIONS. OVERSPD WRITTEN UP IN LOGBOOK. CAPT WAS NOT IN COCKPIT. WAS IN LAVATORY AT THE TIME.
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.