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A CL65 in cruise at FL230 had #1 engine N1 overspd exceeding limits caused by a failed electronic engine control.
| Attributes | |
| ACN | 456232 |
| Time | |
| Date | 199911 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | KY |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| 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 : 10000 flight time type : 4000 |
| ASRS Report | 456232 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : #1 engine indications other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At cruise #1 engine went from 88% N1 to 102% N1. Thrust was reduced per checklists. Engine 'speed' switch (electronic engine control) turned off. Engine responded normally. Operated rest of flight uneventfully. Maintenance wanted to defer speed switches per MEL, without any inspection. Maintenance had to be told several times that engine limits had been exceeded. Maintenance finally conducted inspection and downloaded data from flight data recorder. No other defects or damage found. MEL's and maintenance manuals should be better worded to force maintenance checks or to discourage 'automatic' deferrals.
Original NASA ASRS Text
Title: A CL65 IN CRUISE AT FL230 HAD #1 ENG N1 OVERSPD EXCEEDING LIMITS CAUSED BY A FAILED ELECTRONIC ENG CTL.
Narrative: AT CRUISE #1 ENG WENT FROM 88% N1 TO 102% N1. THRUST WAS REDUCED PER CHKLISTS. ENG 'SPD' SWITCH (ELECTRONIC ENG CTL) TURNED OFF. ENG RESPONDED NORMALLY. OPERATED REST OF FLT UNEVENTFULLY. MAINT WANTED TO DEFER SPD SWITCHES PER MEL, WITHOUT ANY INSPECTION. MAINT HAD TO BE TOLD SEVERAL TIMES THAT ENG LIMITS HAD BEEN EXCEEDED. MAINT FINALLY CONDUCTED INSPECTION AND DOWNLOADED DATA FROM FLT DATA RECORDER. NO OTHER DEFECTS OR DAMAGE FOUND. MEL'S AND MAINT MANUALS SHOULD BE BETTER WORDED TO FORCE MAINT CHKS OR TO DISCOURAGE 'AUTOMATIC' DEFERRALS.
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.