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An EMB145 on descent with autoplt control overshot the assigned altitude due to the wrong altitude selected on the autoplt control panel.
| Attributes | |
| ACN | 400250 |
| Time | |
| Date | 199804 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zau |
| State Reference | IL |
| Altitude | msl bound lower : 16000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 85 flight time total : 16000 flight time type : 16 |
| ASRS Report | 400250 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our carrier is currently introducing the EMB145 regional jet into service and during one particular practice proving run, we were given a descent clearance to 17000 ft. I, as the PNF, noticed the autoplt was not capturing 17000 ft and in fact continued to descend to about 16000 ft before the PF disengaged the autoplt and manually flew the aircraft back to 17000 ft. During this time I immediately checked the altitude preselect and saw momentarily 17400 ft selected. I believe that unfamiliarity led to changing the altitude preselect inadvertently. The altitude preselect, course knob and leading knobs are all located on the glare shield panel and I can see that constant vigilance will be required to insure the correct knob is being adjusted until we all become more familiar with this new aircraft.
Original NASA ASRS Text
Title: AN EMB145 ON DSCNT WITH AUTOPLT CTL OVERSHOT THE ASSIGNED ALT DUE TO THE WRONG ALT SELECTED ON THE AUTOPLT CTL PANEL.
Narrative: OUR CARRIER IS CURRENTLY INTRODUCING THE EMB145 REGIONAL JET INTO SVC AND DURING ONE PARTICULAR PRACTICE PROVING RUN, WE WERE GIVEN A DSCNT CLRNC TO 17000 FT. I, AS THE PNF, NOTICED THE AUTOPLT WAS NOT CAPTURING 17000 FT AND IN FACT CONTINUED TO DSND TO ABOUT 16000 FT BEFORE THE PF DISENGAGED THE AUTOPLT AND MANUALLY FLEW THE ACFT BACK TO 17000 FT. DURING THIS TIME I IMMEDIATELY CHKED THE ALT PRESELECT AND SAW MOMENTARILY 17400 FT SELECTED. I BELIEVE THAT UNFAMILIARITY LED TO CHANGING THE ALT PRESELECT INADVERTENTLY. THE ALT PRESELECT, COURSE KNOB AND LEADING KNOBS ARE ALL LOCATED ON THE GLARE SHIELD PANEL AND I CAN SEE THAT CONSTANT VIGILANCE WILL BE REQUIRED TO INSURE THE CORRECT KNOB IS BEING ADJUSTED UNTIL WE ALL BECOME MORE FAMILIAR WITH THIS NEW ACFT.
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.