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GA small aircraft had to make a forced landing when the student pilot continued single engine demonstration to the point of feathering the propeller.
| Attributes | |
| ACN | 197535 |
| Time | |
| Date | 199112 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : 0ok7 |
| State Reference | OK |
| Altitude | agl bound lower : 0 agl bound upper : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 260 flight time total : 1600 flight time type : 30 |
| ASRS Report | 197535 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After demonstrating single engine en route procedures (ground school), I failed the right engine. The student was through the procedures up through feathering the propeller. Upon pulling the right propeller into the fx detent the student placed his hand on top of the control (propeller) and pushed down locking his arm and the propeller control in the fx detent. I was unable to get his hand off the propeller control before the right engine propeller went into fx. After feathering the propeller I was unable to get the engine restarted. With low density altitude we should have had a 300 FPM climb rate single engine, however while trying to get the airplane to climb the left engine started running rough at the vne plus 10. I couldn't tell if it was the engine or a stall buffet so decided to do a single engine landing at 0ok7. Entering the pattern there was an airplane that was on final which landed and began back taxiing on the runway. The student grabbed the microphone and declared a mayday and told the airplane to get off runway. I landed without incident. Right engine started on the ground. Unfeathering accumulators would have helped.
Original NASA ASRS Text
Title: GA SMA HAD TO MAKE A FORCED LNDG WHEN THE STUDENT PLT CONTINUED SINGLE ENG DEMONSTRATION TO THE POINT OF FEATHERING THE PROP.
Narrative: AFTER DEMONSTRATING SINGLE ENG ENRTE PROCS (GND SCHOOL), I FAILED THE R ENG. THE STUDENT WAS THROUGH THE PROCS UP THROUGH FEATHERING THE PROP. UPON PULLING THE R PROP INTO THE FX DETENT THE STUDENT PLACED HIS HAND ON TOP OF THE CTL (PROP) AND PUSHED DOWN LOCKING HIS ARM AND THE PROP CTL IN THE FX DETENT. I WAS UNABLE TO GET HIS HAND OFF THE PROP CTL BEFORE THE R ENG PROP WENT INTO FX. AFTER FEATHERING THE PROP I WAS UNABLE TO GET THE ENG RESTARTED. WITH LOW DENSITY ALT WE SHOULD HAVE HAD A 300 FPM CLB RATE SINGLE ENG, HOWEVER WHILE TRYING TO GET THE AIRPLANE TO CLB THE L ENG STARTED RUNNING ROUGH AT THE VNE PLUS 10. I COULDN'T TELL IF IT WAS THE ENG OR A STALL BUFFET SO DECIDED TO DO A SINGLE ENG LNDG AT 0OK7. ENTERING THE PATTERN THERE WAS AN AIRPLANE THAT WAS ON FINAL WHICH LANDED AND BEGAN BACK TAXIING ON THE RWY. THE STUDENT GRABBED THE MIKE AND DECLARED A MAYDAY AND TOLD THE AIRPLANE TO GET OFF RWY. I LANDED WITHOUT INCIDENT. R ENG STARTED ON THE GND. UNFEATHERING ACCUMULATORS WOULD HAVE HELPED.
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.