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A DC10-10 in cruise, shut down #1 engine and diverted due to the autothrottle system driving the engines over maximum limits for N1 and egt.
| Attributes | |
| ACN | 372475 |
| Time | |
| Date | 199706 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dsm |
| State Reference | IA |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 10 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other other |
| Route In Use | enroute airway : zmp |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 12000 flight time type : 2000 |
| ASRS Report | 372475 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 9000 flight time type : 2500 |
| ASRS Report | 372476 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
In cruise flight at FL350, the autothrottles drove the engines over maximum limits for N1 and egt. As the movement was very slow, it wasn't noticed until the egt overtemp lights came on on engine #1 and #2. The thrust levers were immediately reduced to normal levels. #1 engine was shut down as a precaution as per the company operations manual. Aircraft was landed without incident. We landed in msp. Callback conversation with reporter revealed the following information: reporter stated the aircraft was a DC10-10 and all 3 engine throttles moved forward but only #1 and #2 were overboosted. He said only engine #1 was replaced. He related the autothrottle system was deferred and is not aware of the corrective action.
Original NASA ASRS Text
Title: A DC10-10 IN CRUISE, SHUT DOWN #1 ENG AND DIVERTED DUE TO THE AUTOTHROTTLE SYS DRIVING THE ENGS OVER MAX LIMITS FOR N1 AND EGT.
Narrative: IN CRUISE FLT AT FL350, THE AUTOTHROTTLES DROVE THE ENGS OVER MAX LIMITS FOR N1 AND EGT. AS THE MOVEMENT WAS VERY SLOW, IT WASN'T NOTICED UNTIL THE EGT OVERTEMP LIGHTS CAME ON ON ENG #1 AND #2. THE THRUST LEVERS WERE IMMEDIATELY REDUCED TO NORMAL LEVELS. #1 ENG WAS SHUT DOWN AS A PRECAUTION AS PER THE COMPANY OPS MANUAL. ACFT WAS LANDED WITHOUT INCIDENT. WE LANDED IN MSP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE ACFT WAS A DC10-10 AND ALL 3 ENG THROTTLES MOVED FORWARD BUT ONLY #1 AND #2 WERE OVERBOOSTED. HE SAID ONLY ENG #1 WAS REPLACED. HE RELATED THE AUTOTHROTTLE SYS WAS DEFERRED AND IS NOT AWARE OF THE CORRECTIVE ACTION.
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.