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An air carrier experienced altdevs of minus 400 ft, and plus 600 ft, while traversing a mountain wave.
| Attributes | |
| ACN | 298749 |
| Time | |
| Date | 199503 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dvv |
| State Reference | CO |
| Altitude | msl bound lower : 36600 msl bound upper : 37600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zdv |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 60 |
| ASRS Report | 298749 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 5000 flight time type : 300 |
| ASRS Report | 298650 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Strong mountain wave. Autoplt was connected, and we experienced altitude variations of plus, or minus 300 ft, continually. 1 wave took us to FL37.6, before we started down. (Noted by controller). Tried autoplt in turbulence mode, and also, flew by hand. Constant variations of 300-400 ft from assigned altitude, with moderate chop. Other aircraft, in vicinity, reported similar problems.
Original NASA ASRS Text
Title: AN ACR EXPERIENCED ALTDEVS OF MINUS 400 FT, AND PLUS 600 FT, WHILE TRAVERSING A MOUNTAIN WAVE.
Narrative: STRONG MOUNTAIN WAVE. AUTOPLT WAS CONNECTED, AND WE EXPERIENCED ALT VARIATIONS OF PLUS, OR MINUS 300 FT, CONTINUALLY. 1 WAVE TOOK US TO FL37.6, BEFORE WE STARTED DOWN. (NOTED BY CTLR). TRIED AUTOPLT IN TURB MODE, AND ALSO, FLEW BY HAND. CONSTANT VARIATIONS OF 300-400 FT FROM ASSIGNED ALT, WITH MODERATE CHOP. OTHER ACFT, IN VICINITY, RPTED SIMILAR PROBS.
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.