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MD80 super 80 while deviating around WX descended a few hundred ft below assigned altitude when autoplt failed to maintain altitude.
| Attributes | |
| ACN | 367191 |
| Time | |
| Date | 199704 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cty |
| State Reference | FL |
| Altitude | msl bound lower : 34700 msl bound upper : 35000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx tower : phl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 367191 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather 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 | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Deviating around thunderstorms in area. WX radar did not show any WX. But, got into some turbulence. Aircraft airspeed began to slow. Aircraft began to descend off altitude. Turned off autoplt and autothrottles and hand flew aircraft. We had descended a few hundred ft off of our assigned altitude due to turbulence we encountered.
Original NASA ASRS Text
Title: MD80 SUPER 80 WHILE DEVIATING AROUND WX DSNDED A FEW HUNDRED FT BELOW ASSIGNED ALT WHEN AUTOPLT FAILED TO MAINTAIN ALT.
Narrative: DEVIATING AROUND TSTMS IN AREA. WX RADAR DID NOT SHOW ANY WX. BUT, GOT INTO SOME TURB. ACFT AIRSPD BEGAN TO SLOW. ACFT BEGAN TO DSND OFF ALT. TURNED OFF AUTOPLT AND AUTOTHROTTLES AND HAND FLEW ACFT. WE HAD DSNDED A FEW HUNDRED FT OFF OF OUR ASSIGNED ALT DUE TO TURB WE ENCOUNTERED.
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.