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A commuter aircraft returns to gate with left engine shut down after it had exceeded the torque values. The engine had been placed in 'feathered' position as a fuel savings procedure during taxi and when placed to 'minimum RPM' position, the propeller failed to fully unfeather.
| Attributes | |
| ACN | 415717 |
| Time | |
| Date | 199810 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : den |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : holding ground other : taxi |
| 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 : 242 flight time total : 12384 flight time type : 2710 |
| ASRS Report | 415717 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
In anticipation of a delay and to conserve fuel, left engine was placed back in 'feathered.' just prior to cleared for 'position and hold,' left condition lever moved from feather to minimum (unfeather). As propeller started to unfeather it hung up in critical range and torque rapidly increased. Condition lever was moved back to feather but torque continued to rapidly increase. Condition lever was set to fuel cut-off and engine shut down. Torque exceedance occurred and was noted. Aircraft returned to gate with right engine power only and without further incidents. Maintenance was notified.
Original NASA ASRS Text
Title: A COMMUTER ACFT RETURNS TO GATE WITH L ENG SHUT DOWN AFTER IT HAD EXCEEDED THE TORQUE VALUES. THE ENG HAD BEEN PLACED IN 'FEATHERED' POS AS A FUEL SAVINGS PROC DURING TAXI AND WHEN PLACED TO 'MINIMUM RPM' POS, THE PROP FAILED TO FULLY UNFEATHER.
Narrative: IN ANTICIPATION OF A DELAY AND TO CONSERVE FUEL, L ENG WAS PLACED BACK IN 'FEATHERED.' JUST PRIOR TO CLRED FOR 'POS AND HOLD,' L CONDITION LEVER MOVED FROM FEATHER TO MINIMUM (UNFEATHER). AS PROP STARTED TO UNFEATHER IT HUNG UP IN CRITICAL RANGE AND TORQUE RAPIDLY INCREASED. CONDITION LEVER WAS MOVED BACK TO FEATHER BUT TORQUE CONTINUED TO RAPIDLY INCREASE. CONDITION LEVER WAS SET TO FUEL CUT-OFF AND ENG SHUT DOWN. TORQUE EXCEEDANCE OCCURRED AND WAS NOTED. ACFT RETURNED TO GATE WITH R ENG PWR ONLY AND WITHOUT FURTHER INCIDENTS. MAINT WAS NOTIFIED.
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.