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A service engineer reports PT6A engines used on cessna caravan aircraft are displaying above average in-flight shutdowns. Compressor turbine distress.
| Attributes | |
| ACN | 638019 |
| Time | |
| Date | 200411 |
| Day | Tue |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | FO |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Caravan 1 208A |
| Operating Under FAR Part | Part 135 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | other personnel other |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 638019 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : egt indicator other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication Company |
| Primary Problem | Aircraft |
Narrative:
A service engineer reports PT6A engines used on cessna caravan aircraft are displaying above average in-flight shutdowns. Compressor turbine distress. Callback conversation with reporter revealed the following information: the manufacturer believes the engine removals are non basic, unplanned removals, which means there is no defect in the design or manufacture. The compressor turbine blades are failing due to stretch or creep.
Original NASA ASRS Text
Title: A SVC ENGINEER RPTS PT6A ENGS USED ON CESSNA CARAVAN ACFT ARE DISPLAYING ABOVE AVERAGE INFLT SHUTDOWNS. COMPRESSOR TURBINE DISTRESS.
Narrative: A SVC ENGINEER RPTS PT6A ENGS USED ON CESSNA CARAVAN ACFT ARE DISPLAYING ABOVE AVERAGE INFLT SHUTDOWNS. COMPRESSOR TURBINE DISTRESS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE MANUFACTURER BELIEVES THE ENG REMOVALS ARE NON BASIC, UNPLANNED REMOVALS, WHICH MEANS THERE IS NO DEFECT IN THE DESIGN OR MANUFACTURE. THE COMPRESSOR TURBINE BLADES ARE FAILING DUE TO STRETCH OR CREEP.
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.