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An md super 80 in cruise at FL310 with autoplt engaged selected pt 75 mach and had aircraft climb to FL312 deviating from assigned altitude.
| Attributes | |
| ACN | 432279 |
| Time | |
| Date | 199903 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zjx.artcc |
| State Reference | FL |
| Altitude | msl bound lower : 31000 msl bound upper : 31200 |
| Environment | |
| Weather Elements | Turbulence |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| 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 : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 432279 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| ASRS Report | 432280 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | aircraft equipment : altitude alert |
| Resolutory Action | flight crew : returned to assigned airspace |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Encountered moderate chop with autoplt on in performance mode. Selected mach select .75. Several mins later, altitude alert sounded. Aircraft was at FL312 and climbing 100 FPM. Returned aircraft to FL310. No comment from ATC. No known traffic conflict.
Original NASA ASRS Text
Title: AN MD SUPER 80 IN CRUISE AT FL310 WITH AUTOPLT ENGAGED SELECTED PT 75 MACH AND HAD ACFT CLB TO FL312 DEVIATING FROM ASSIGNED ALT.
Narrative: ENCOUNTERED MODERATE CHOP WITH AUTOPLT ON IN PERFORMANCE MODE. SELECTED MACH SELECT .75. SEVERAL MINS LATER, ALT ALERT SOUNDED. ACFT WAS AT FL312 AND CLBING 100 FPM. RETURNED ACFT TO FL310. NO COMMENT FROM ATC. NO KNOWN TFC CONFLICT.
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.