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An md super 80 at FL290 with autoplt on altitude hold deviated from assigned altitude and when corrections made the autoplt commanded a 1000 FPM descent. Descended 400 ft before correction back to FL290 was made.
| Attributes | |
| ACN | 372629 |
| Time | |
| Date | 199706 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : fmg |
| State Reference | NV |
| Altitude | msl bound lower : 28600 msl bound upper : 29300 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| 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 |
| Route In Use | enroute airway : zoa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 372629 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 372630 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Altitude alert went off at 300 ft high, selected vertical speed to correct. Then hit altitude hold, at which time the autoplt went into a 1000 ft rate descent. Disconnected autoplt at 400 ft below FL290 and immediately corrected back to FL290. Reconnected autoplt with no further problems.
Original NASA ASRS Text
Title: AN MD SUPER 80 AT FL290 WITH AUTOPLT ON ALT HOLD DEVIATED FROM ASSIGNED ALT AND WHEN CORRECTIONS MADE THE AUTOPLT COMMANDED A 1000 FPM DSCNT. DSNDED 400 FT BEFORE CORRECTION BACK TO FL290 WAS MADE.
Narrative: ALT ALERT WENT OFF AT 300 FT HIGH, SELECTED VERT SPD TO CORRECT. THEN HIT ALT HOLD, AT WHICH TIME THE AUTOPLT WENT INTO A 1000 FT RATE DSCNT. DISCONNECTED AUTOPLT AT 400 FT BELOW FL290 AND IMMEDIATELY CORRECTED BACK TO FL290. RECONNECTED AUTOPLT WITH NO FURTHER PROBS.
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.