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Flight crew of an ATR72 descended below assigned altitude due to the autoplt not capturing the altitude due to the incorrect altitude was set in the autoplt altitude select.
| Attributes | |
| ACN | 412150 |
| Time | |
| Date | 199808 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cyy |
| State Reference | FL |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 72 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zma |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 500 |
| ASRS Report | 412150 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| 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:
Autoplt failed to level at the assigned altitude during a descent. Altitude was not set correctly before the descent was started. We were 500 ft below the assigned altitude when we caught the error and climbed back. The autoplt can change altitude without the altitude preselect being set.
Original NASA ASRS Text
Title: FLC OF AN ATR72 DSNDED BELOW ASSIGNED ALT DUE TO THE AUTOPLT NOT CAPTURING THE ALT DUE TO THE INCORRECT ALT WAS SET IN THE AUTOPLT ALT SELECT.
Narrative: AUTOPLT FAILED TO LEVEL AT THE ASSIGNED ALT DURING A DSCNT. ALT WAS NOT SET CORRECTLY BEFORE THE DSCNT WAS STARTED. WE WERE 500 FT BELOW THE ASSIGNED ALT WHEN WE CAUGHT THE ERROR AND CLBED BACK. THE AUTOPLT CAN CHANGE ALT WITHOUT THE ALT PRESELECT BEING SET.
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.