 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Crj-200 first officer reported an altitude preselect anomaly led to an altitude overshoot on arrival into lga.
| Attributes | |
| ACN | 1478270 |
| Time | |
| Date | 201709 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | LGA.Airport |
| State Reference | NY |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | MCP |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance |
Narrative:
During cruise; we noticed that the altitude preselect bug would randomly jump to a new altitude without us touching the altitude knob. This happened one or two times; and then stopped for 20 minutes or so. On approach into lga; we were assigned and selected 4000 feet. Right before altitude capture occurred; the altitude preselect jumped to around 50;000 feet or so; and jumped up and down in that range; settling at around 46;000 feet. As such; we went through the assigned altitude since altitude capture did not occur; stopping our descent at about 3500 feet. As we were correcting back to 4000; ATC told us to maintain 4;000. We told them we were having an autopilot issue; and they asked if we needed assistance. After this point; I hand flew / used the 'altitude hold' function. No further incident occurred and no phone number was given to us.my main error was that I looked away from the FMA as we were nearing altitude capture. I had made sure to closely monitor this whenever we were approaching a new altitude after I saw the altitude preselect jumping around on its own; except this time I was looking away for too long and at the wrong time.
Original NASA ASRS Text
Title: CRJ-200 First Officer reported an altitude preselect anomaly led to an altitude overshoot on arrival into LGA.
Narrative: During cruise; we noticed that the altitude preselect bug would randomly jump to a new altitude without us touching the altitude knob. This happened one or two times; and then stopped for 20 minutes or so. On approach into LGA; we were assigned and selected 4000 feet. Right before altitude capture occurred; the altitude preselect jumped to around 50;000 feet or so; and jumped up and down in that range; settling at around 46;000 feet. As such; we went through the assigned altitude since altitude capture did not occur; stopping our descent at about 3500 feet. As we were correcting back to 4000; ATC told us to maintain 4;000. We told them we were having an autopilot issue; and they asked if we needed assistance. After this point; I hand flew / used the 'altitude hold' function. No further incident occurred and no phone number was given to us.My main error was that I looked away from the FMA as we were nearing altitude capture. I had made sure to closely monitor this whenever we were approaching a new altitude after I saw the altitude preselect jumping around on its own; except this time I was looking away for too long and at the wrong time.
Data retrieved from NASA's ASRS site 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.