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The #1 engine on a DHC8 starts to accelerate at the ramp just after starting #2 engine and after the external power unit was disconnected.
| Attributes | |
| ACN | 428957 |
| Time | |
| Date | 199902 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx.airport |
| State Reference | AZ |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground other : eng start |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3900 flight time type : 300 |
| ASRS Report | 428957 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : torque meter other flight crewa |
| Resolutory Action | flight crew : overrode automation |
| Consequence | other Other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
After both engines were started normally and within limits, the external power switch was selected off. There was a change in the sound of the #1 engine. It was accelerating, the external power switch was selected back on. Upon scanning the engine gauges, the torque was accelerating through 124%. The engine was immediately shut down. Maintenance was called and another start was attempted. On the second attempt the engine started to accelerate and was shut down at 50%. A third attempt was made with the ecu selected to manual mode. This appeared to be the source of the problem. When the ecu was turned back on the 'runaway' situation was duplicated.
Original NASA ASRS Text
Title: THE #1 ENG ON A DHC8 STARTS TO ACCELERATE AT THE RAMP JUST AFTER STARTING #2 ENG AND AFTER THE EXTERNAL PWR UNIT WAS DISCONNECTED.
Narrative: AFTER BOTH ENGS WERE STARTED NORMALLY AND WITHIN LIMITS, THE EXTERNAL PWR SWITCH WAS SELECTED OFF. THERE WAS A CHANGE IN THE SOUND OF THE #1 ENG. IT WAS ACCELERATING, THE EXTERNAL PWR SWITCH WAS SELECTED BACK ON. UPON SCANNING THE ENG GAUGES, THE TORQUE WAS ACCELERATING THROUGH 124%. THE ENG WAS IMMEDIATELY SHUT DOWN. MAINT WAS CALLED AND ANOTHER START WAS ATTEMPTED. ON THE SECOND ATTEMPT THE ENG STARTED TO ACCELERATE AND WAS SHUT DOWN AT 50%. A THIRD ATTEMPT WAS MADE WITH THE ECU SELECTED TO MANUAL MODE. THIS APPEARED TO BE THE SOURCE OF THE PROB. WHEN THE ECU WAS TURNED BACK ON THE 'RUNAWAY' SIT WAS DUPLICATED.
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.