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An L1011-250 flight crew encounters turbulence and descends 400-500 ft below their assigned altitude.
| Attributes | |
| ACN | 354900 |
| Time | |
| Date | 199612 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lin |
| State Reference | CA |
| Altitude | msl bound lower : 28500 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa artcc : edff |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011-1 100/200/250 |
| 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 : second officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 8000 flight time type : 1000 |
| ASRS Report | 354900 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 354623 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence : far |
| 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 | other |
Narrative:
After level off FL290 (approximately 3-5 mins) aircraft encountered turbulence, aircraft descended 400-500 ft prior to pilot inputs corrected back to FL290.
Original NASA ASRS Text
Title: AN L1011-250 FLC ENCOUNTERS TURB AND DSNDS 400-500 FT BELOW THEIR ASSIGNED ALT.
Narrative: AFTER LEVEL OFF FL290 (APPROX 3-5 MINS) ACFT ENCOUNTERED TURB, ACFT DSNDED 400-500 FT PRIOR TO PLT INPUTS CORRECTED BACK TO FL290.
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.