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When the pc-12 suffered abnormal propeller RPM response the flight was continued to destination where; upon landing; the prop failed to shift to beta mode and the aircraft accelerated and demanding immediate and extreme braking to stop on the runway. Both main gear tires were flatted and deflated as a result. No injuries or other damage to the aircraft.
| Attributes | |
| ACN | 1204018 |
| Time | |
| Date | 201409 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | EVV.Airport |
| State Reference | IN |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Landing |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Propeller |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Flight Instructor Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 7043 Flight Crew Type 35 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
En-route an abnormally low prop rpm was noted (below the normal; governed cruise rpm which is not controllable by the pilot). The emergency checklist was consulted. The problem could not be resolved but it was determined that the flight could be continued to destination. On approach; as the power was reduced the prop rpm continued to reduce. Because the possibility of other prop anomalies was anticipated; some power was kept in until just prior to touch down. After touchdown power was reduced to idle and beta was selected. Instead of braking action resulting; the aircraft was felt to surge forward. The power lever was returned to flight idle and the condition lever moved to ground idle. Heavy braking was applied; resulting in both tires being flat spotted and deflating. After slowing the aircraft was taxied clear of the runway onto a taxiway and shut down. No further damage resulted.
Original NASA ASRS Text
Title: When the PC-12 suffered abnormal propeller RPM response the flight was continued to destination where; upon landing; the prop failed to shift to Beta mode and the aircraft accelerated and demanding immediate and extreme braking to stop on the runway. Both main gear tires were flatted and deflated as a result. No injuries or other damage to the aircraft.
Narrative: En-route an abnormally low prop rpm was noted (below the normal; governed cruise rpm which is not controllable by the pilot). The emergency checklist was consulted. The problem could not be resolved but it was determined that the flight could be continued to destination. On approach; as the power was reduced the prop rpm continued to reduce. Because the possibility of other prop anomalies was anticipated; some power was kept in until just prior to touch down. After touchdown power was reduced to idle and beta was selected. Instead of braking action resulting; the aircraft was felt to surge forward. The power lever was returned to flight idle and the condition lever moved to ground idle. Heavy braking was applied; resulting in both tires being flat spotted and deflating. After slowing the aircraft was taxied clear of the runway onto a taxiway and shut down. No further damage resulted.
Data retrieved from NASA's ASRS site 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.