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A pilot reported losing two pt-6 engines on the same aircraft within the past year; both of which had less than 700 hours ttsn.
| Attributes | |
| ACN | 791567 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 15000 msl bound upper : 15500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Medium Transport Low Wing 2 Turboprop Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 32 flight time total : 1320 flight time type : 101 |
| ASRS Report | 791567 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : landed in emergency condition |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
This is the second PT6A-34 engine that has failed in this aircraft within the past year and 165 hours of flight time. First engine failed in-flight in july 2007. Engine had 509.3 hours on it since new. Second engine had approximately 674 hours on it at failure june 2008. The fuel control unit (FCU) on first engine was found to be loose and a contributing factor to the failure. The first thing to be checked on second engine was the FCU and it was found to be loose from its mounting base. The inspection was done by a mechanic. His finding was confirmed by a pratt and whitney representative. Mechanic also documented this with photographs and feeler gauge.callback conversation with reporter revealed the following information: reporter stated both failures appear to be related to the fuel control unit coming loose from its mount. They were sequential build new engines with feb 2002 production dates.
Original NASA ASRS Text
Title: A PILOT REPORTED LOSING TWO PT-6 ENGINES ON THE SAME AIRCRAFT WITHIN THE PAST YEAR; BOTH OF WHICH HAD LESS THAN 700 HRS TTSN.
Narrative: THIS IS THE SECOND PT6A-34 ENG THAT HAS FAILED IN THIS ACFT WITHIN THE PAST YEAR AND 165 HOURS OF FLT TIME. FIRST ENG FAILED INFLT IN JULY 2007. ENG HAD 509.3 HOURS ON IT SINCE NEW. SECOND ENG HAD APPROX 674 HOURS ON IT AT FAILURE JUNE 2008. THE FUEL CONTROL UNIT (FCU) ON FIRST ENG WAS FOUND TO BE LOOSE AND A CONTRIBUTING FACTOR TO THE FAILURE. THE FIRST THING TO BE CHECKED ON SECOND ENG WAS THE FCU AND IT WAS FOUND TO BE LOOSE FROM ITS MOUNTING BASE. THE INSPECTION WAS DONE BY A MECHANIC. HIS FINDING WAS CONFIRMED BY A PRATT AND WHITNEY REPRESENTATIVE. MECHANIC ALSO DOCUMENTED THIS WITH PHOTOGRAPHS AND FEELER GAUGE.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED BOTH FAILURES APPEAR TO BE RELATED TO THE FUEL CONTROL UNIT COMING LOOSE FROM ITS MOUNT. THEY WERE SEQUENTIAL BUILD NEW ENGINES WITH FEB 2002 PRODUCTION DATES.
Data retrieved from NASA's ASRS site as of May 2009 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.