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A B738 crew during cruise at FL390, encountered a light to moderate mountain wave, causing an altitude loss of 500 ft before returning to FL390.
| Attributes | |
| ACN | 544399 |
| Time | |
| Date | 200204 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : ocs.vortac |
| State Reference | CO |
| Altitude | agl single value : 39000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Turbulence other |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine pilot : private |
| Experience | flight time last 90 days : 140 flight time total : 8000 flight time type : 450 |
| ASRS Report | 544399 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance |
| Primary Problem | Environmental Factor |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft en route at FL390 experiences light to moderate mountain wave turbulence. First officer at controls. Aircraft lost 500 ft prior to stabilizing and climbing back to FL390, reported to ZDV.
Original NASA ASRS Text
Title: A B738 CREW DURING CRUISE AT FL390, ENCOUNTERED A LIGHT TO MODERATE MOUNTAIN WAVE, CAUSING AN ALT LOSS OF 500 FT BEFORE RETURNING TO FL390.
Narrative: ACFT ENRTE AT FL390 EXPERIENCES LIGHT TO MODERATE MOUNTAIN WAVE TURB. FO AT CTLS. ACFT LOST 500 FT PRIOR TO STABILIZING AND CLBING BACK TO FL390, RPTED TO ZDV.
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.