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A CRJ200's left engine N1 accelerated well above 100% at which time the left engine speed switch was turned off; the N1 recovered and the flight returned to the departure airport for maintenance.
| Attributes | |
| ACN | 939585 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine Control |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Climbing through 11;000 ft MSL on the RNAV departure; aircraft had uncommanded acceleration on left engine. N1 indication accelerated to well above 100 percent prior to thrust reduction. All other engine indications were tracking higher at time of event; but we did not observe any other exceedences. Aircraft had history of uncommanded accelerations; I believe ours was the 3rd within two weeks. We turned off engine speed switch for left engine as per our QRH; but we recovered speed control with small amount of thrust reduction. After conferring with maintenance we return to the departure airport. We landed overweight 49;300 pounds at descent rate of 150 ft/min. No emergency was declared. Center provided delaying vectors while troubleshooting; and later cleared us back to the destination where we landed with out any further problems.
Original NASA ASRS Text
Title: A CRJ200's left engine N1 accelerated well above 100% at which time the left ENGINE SPEED switch was turned off; the N1 recovered and the flight returned to the departure airport for maintenance.
Narrative: Climbing through 11;000 FT MSL on the RNAV Departure; aircraft had uncommanded acceleration on left engine. N1 indication accelerated to well above 100 percent prior to thrust reduction. All other engine indications were tracking higher at time of event; but we did not observe any other exceedences. Aircraft had history of uncommanded accelerations; I believe ours was the 3rd within two weeks. We turned off engine speed switch for left engine as per our QRH; but we recovered speed control with small amount of thrust reduction. After conferring with Maintenance we return to the departure airport. We landed overweight 49;300 LBS at descent rate of 150 FT/MIN. No emergency was declared. Center provided delaying vectors while troubleshooting; and later cleared us back to the destination where we landed with out any further problems.
Data retrieved from NASA's ASRS site as of April 2012 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.