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A descending MD88 overshoots its assigned altitude by 250 ft when the autoplt trips off 10 mi west of mad, ct.
| Attributes | |
| ACN | 473070 |
| Time | |
| Date | 200005 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | CT |
| Altitude | msl bound lower : 9750 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bdl.tracon tower : mry.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 17000 flight time type : 1200 |
| ASRS Report | 473070 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Company |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
10 mi west of mad VOR, ATC cleared us (an MD88) to descend from 11000 ft to 10000 ft MSL. Upon leveloff at 10000 ft, the #1 autoplt disengaged causing the aircraft to descend through 10000 ft. A gentle pullup was initiated to stop descent and return to 10000 ft. Aircraft descended to approximately 9750 ft. Autoplt was written up in maintenance manual. No further discrepancies noted.
Original NASA ASRS Text
Title: A DSNDING MD88 OVERSHOOTS ITS ASSIGNED ALT BY 250 FT WHEN THE AUTOPLT TRIPS OFF 10 MI W OF MAD, CT.
Narrative: 10 MI W OF MAD VOR, ATC CLRED US (AN MD88) TO DSND FROM 11000 FT TO 10000 FT MSL. UPON LEVELOFF AT 10000 FT, THE #1 AUTOPLT DISENGAGED CAUSING THE ACFT TO DSND THROUGH 10000 FT. A GENTLE PULLUP WAS INITIATED TO STOP DSCNT AND RETURN TO 10000 FT. ACFT DSNDED TO APPROX 9750 FT. AUTOPLT WAS WRITTEN UP IN MAINT MANUAL. NO FURTHER DISCREPANCIES NOTED.
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.