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Be-76 instructor pilot reported the left engine did not unfeather following a test flight shutdown.
| Attributes | |
| ACN | 1455372 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Duchess 76 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Propeller Pitch Change Mechanism |
| Person 1 | |
| Function | Instructor Pilot Flying |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
As per [procedure]; we had to shut down the engine and restart it in the air. When trying to unfeather the left propeller; blade angle did not move at all so the left propeller did not unfeather. Tried to restart the left engine using the 'without unfeathering accumulator' checklist and the left engine did not move; we cranked the engine 4 times up in the air with no success. Decided to come back to land single engine. We requested priority but did not declare emergency. On the ground we tried to restart the engine with no success; we tried 3 times. On the ramp with the chief instructor and a mechanic we tried to figure what the issue was; apparently the accumulator does not have enough pressure to unfeather the propeller; showed about 35 psi when the aircraft's manual says it should have approximately 300PSI.airplane went down for the same reason one day before this incident happened. Mechanics should double check that the airplane systems are working properly before putting the airplane back on line. Probably a second opinion of how the squawk was resolved could help to prevent this scenario.
Original NASA ASRS Text
Title: BE-76 instructor pilot reported the left engine did not unfeather following a test flight shutdown.
Narrative: As per [procedure]; we had to shut down the engine and restart it in the air. When trying to unfeather the left propeller; blade angle did not move at all so the left propeller did not unfeather. Tried to restart the left engine using the 'without unfeathering accumulator' checklist and the left engine did not move; we cranked the engine 4 times up in the air with no success. Decided to come back to land single engine. We requested priority but did not declare emergency. On the ground we tried to restart the engine with no success; we tried 3 times. On the ramp with the Chief Instructor and a mechanic we tried to figure what the issue was; apparently the accumulator does not have enough pressure to unfeather the propeller; showed about 35 PSI when the aircraft's manual says it should have approximately 300PSI.Airplane went down for the same reason one day before this incident happened. Mechanics should double check that the airplane systems are working properly before putting the airplane back on line. Probably a second opinion of how the squawk was resolved could help to prevent this scenario.
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.