 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An LA1011 pacific flight experiences unforecast turbulence and loses 400 ft in altitude while on autoplt near scoon intersection. Pacific control region of ZOA, ca.
| Attributes | |
| ACN | 455800 |
| Time | |
| Date | 199911 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zoa.artcc |
| State Reference | CA |
| Altitude | msl bound lower : 33600 msl bound upper : 34000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : cfi pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 5000 flight time type : 3000 |
| ASRS Report | 455800 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Environmental Factor |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Shortly after passing 'scoon' eastbound, encountered unexpected moderate turbulence. With autoplt engaged, aircraft descended approximately 400 ft from assigned altitude of 40340. Company meteorology was called prior to departure and stated previously reported turbulence information was hours old, and turbulence was no longer in the departure area. PIREPS were requested, if they later became available, or any reports or turbulence along our route. About 20 mins prior to scoon, a report of light turbulence at scoon at FL330 was received from flight control reported about an hour before by a company aircraft. The moderate turbulence was not forecast.
Original NASA ASRS Text
Title: AN LA1011 PACIFIC FLT EXPERIENCES UNFORECAST TURB AND LOSES 400 FT IN ALT WHILE ON AUTOPLT NEAR SCOON INTXN. PACIFIC CTL REGION OF ZOA, CA.
Narrative: SHORTLY AFTER PASSING 'SCOON' EBOUND, ENCOUNTERED UNEXPECTED MODERATE TURB. WITH AUTOPLT ENGAGED, ACFT DSNDED APPROX 400 FT FROM ASSIGNED ALT OF 40340. COMPANY METEOROLOGY WAS CALLED PRIOR TO DEP AND STATED PREVIOUSLY RPTED TURB INFO WAS HRS OLD, AND TURB WAS NO LONGER IN THE DEP AREA. PIREPS WERE REQUESTED, IF THEY LATER BECAME AVAILABLE, OR ANY RPTS OR TURB ALONG OUR RTE. ABOUT 20 MINS PRIOR TO SCOON, A RPT OF LIGHT TURB AT SCOON AT FL330 WAS RECEIVED FROM FLT CTL RPTED ABOUT AN HR BEFORE BY A COMPANY ACFT. THE MODERATE TURB WAS NOT FORECAST.
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.