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Flight crew of BE1900D has trouble holding assigned altitude due to updrafts and downdrafts over mountain area. Airspeed overspd warning activates.
| Attributes | |
| ACN | 361816 |
| Time | |
| Date | 199702 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 22000 msl bound upper : 22500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 190 flight time total : 2677 flight time type : 200 |
| ASRS Report | 361816 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Not being familiar or experienced with mountain waves actions, the aircraft all of a sudden climbed. We gained 500 ft. I brought the power back to flight idle and pitch down the airspeed -- overspd warning went off. I got the aircraft back under control and at our assigned altitude. There were no conflicts or alerts. There also was no mention of an altitude bust by the controllers -- the WX at the time was IMC and turbulent in the colorado/new mexico area. There also was severe up and downdrafts in the clouds.
Original NASA ASRS Text
Title: FLC OF BE1900D HAS TROUBLE HOLDING ASSIGNED ALT DUE TO UPDRAFTS AND DOWNDRAFTS OVER MOUNTAIN AREA. AIRSPD OVERSPD WARNING ACTIVATES.
Narrative: NOT BEING FAMILIAR OR EXPERIENCED WITH MOUNTAIN WAVES ACTIONS, THE ACFT ALL OF A SUDDEN CLBED. WE GAINED 500 FT. I BROUGHT THE PWR BACK TO FLT IDLE AND PITCH DOWN THE AIRSPD -- OVERSPD WARNING WENT OFF. I GOT THE ACFT BACK UNDER CTL AND AT OUR ASSIGNED ALT. THERE WERE NO CONFLICTS OR ALERTS. THERE ALSO WAS NO MENTION OF AN ALT BUST BY THE CTLRS -- THE WX AT THE TIME WAS IMC AND TURBULENT IN THE COLORADO/NEW MEXICO AREA. THERE ALSO WAS SEVERE UP AND DOWNDRAFTS IN THE CLOUDS.
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.