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An air carrier EMB120 crew failed to level off at their assigned altitude. Altitude deviation. Possible aircraft equipment problem autoplt altitude capture failed to capture, altitude alert not properly armed or inoperative.
| Attributes | |
| ACN | 341510 |
| Time | |
| Date | 199607 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 3500 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : cvg |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 3700 flight time type : 1300 |
| ASRS Report | 341510 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : became reoriented flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While being radar vectored to the ILS runway 18R at cvg, we were cleared to descend to 4000 ft from 5000 ft. I gave the autoplt/flight director the command to descend to 4000 ft MSL. While navigating around a turbulent cloud mass, I noticed the autoplt failed to capture 4000 ft and continued to descend to approximately 3500 ft MSL. I immediately corrected the situation and climbed back up to 4000 ft MSL. ATC never mentioned the situation and the remaining flight was routine. Also, the WX was not as forecast.
Original NASA ASRS Text
Title: AN ACR EMB120 CREW FAILED TO LEVEL OFF AT THEIR ASSIGNED ALT. ALTDEV. POSSIBLE ACFT EQUIP PROB AUTOPLT ALT CAPTURE FAILED TO CAPTURE, ALT ALERT NOT PROPERLY ARMED OR INOP.
Narrative: WHILE BEING RADAR VECTORED TO THE ILS RWY 18R AT CVG, WE WERE CLRED TO DSND TO 4000 FT FROM 5000 FT. I GAVE THE AUTOPLT/FLT DIRECTOR THE COMMAND TO DSND TO 4000 FT MSL. WHILE NAVING AROUND A TURBULENT CLOUD MASS, I NOTICED THE AUTOPLT FAILED TO CAPTURE 4000 FT AND CONTINUED TO DSND TO APPROX 3500 FT MSL. I IMMEDIATELY CORRECTED THE SIT AND CLBED BACK UP TO 4000 FT MSL. ATC NEVER MENTIONED THE SIT AND THE REMAINING FLT WAS ROUTINE. ALSO, THE WX WAS NOT AS FORECAST.
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.