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An instructor pilot aboard a beech duchess was surprised when; after turning off the runway following a landing; the left propeller feathered for no apparent reason. This was the fourth instance of this exact event despite the aircraft being returned to service following each of the prior three events.
| Attributes | |
| ACN | 1031427 |
| Time | |
| Date | 201208 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Duchess 76 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Taxi |
| Route In Use | Visual Approach |
| Flight Plan | None |
| Component | |
| Aircraft Component | Propeller Pitch Change Mechanism |
| Person 1 | |
| Function | Instructor Pilot Flying |
| Qualification | Flight Crew Commercial Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 620 Flight Crew Type 80 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance |
Narrative:
After completing several landings at a local airport; I requested a full stop taxi back to the active runway. Upon exiting the runway the propeller on the left engine feathered without an adjustment of the prop governor or a decrease in oil pressure. The rpms were low but the manifold pressure remained high which was an immediate notification that something was not right.because only one propeller feathered it made it difficult and unsafe to continue taxiing at the controlled airfield. I then requested assistance from tower and informed them of the situation. We were clear of all runways but sat on taxiway a until the FBO was able to tow us back to the ramp. The problem has occurred three times before on the same aircraft. The aircraft has been squawked previously and returned to service but the problem persists.
Original NASA ASRS Text
Title: An instructor pilot aboard a Beech Duchess was surprised when; after turning off the runway following a landing; the left propeller feathered for no apparent reason. This was the fourth instance of this exact event despite the aircraft being returned to service following each of the prior three events.
Narrative: After completing several landings at a local airport; I requested a full stop taxi back to the active runway. Upon exiting the runway the propeller on the left engine feathered without an adjustment of the prop governor or a decrease in oil pressure. The RPMs were low but the manifold pressure remained high which was an immediate notification that something was not right.Because only one propeller feathered it made it difficult and unsafe to continue taxiing at the controlled airfield. I then requested assistance from Tower and informed them of the situation. We were clear of all runways but sat on Taxiway A until the FBO was able to tow us back to the ramp. The problem has occurred three times before on the same aircraft. The aircraft has been squawked previously and returned to service but the problem persists.
Data retrieved from NASA's ASRS site as of July 2013 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.