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A student failed to correct for asymmetrical thrust at takeoff. The aircraft swerved to the left, into the gravel, after the flight instructor simulated a left engine failure.
| Attributes | |
| ACN | 324357 |
| Time | |
| Date | 199512 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : instructional |
| Make Model Name | Duchess 76 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor observation : company check pilot |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 1480 flight time type : 300 |
| ASRS Report | 324357 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : private pilot : instrument |
| Events | |
| Anomaly | non adherence : far other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was conducting a multi-engine stage check in a duchess. The student was seeking his commercial multi-engine rating. I asked him to perform a short field takeoff on runway 27R oak. Just after the brakes were released for takeoff, I simulated an engine failure by failing the left engine's mixture control. The student did not react to the asymmetrical thrust by retarding the throttles so consequently the airplane swerved to the left into the gravel off the runway. A corrective action could have been for myself to either retard the right mixture (in addition to the left) or to override the student's action (or inaction) by retarding both throttles myself. As the examiner, I did not want to correct the problem immediately so as not to be able to evaluate the student's corrective procedures, response and judgement. However, in this case I waited too long to take control of the airplane.
Original NASA ASRS Text
Title: A STUDENT FAILED TO CORRECT FOR ASYMMETRICAL THRUST AT TKOF. THE ACFT SWERVED TO THE L, INTO THE GRAVEL, AFTER THE FLT INSTRUCTOR SIMULATED A L ENG FAILURE.
Narrative: I WAS CONDUCTING A MULTI-ENG STAGE CHK IN A DUCHESS. THE STUDENT WAS SEEKING HIS COMMERCIAL MULTI-ENG RATING. I ASKED HIM TO PERFORM A SHORT FIELD TKOF ON RWY 27R OAK. JUST AFTER THE BRAKES WERE RELEASED FOR TKOF, I SIMULATED AN ENG FAILURE BY FAILING THE L ENG'S MIXTURE CTL. THE STUDENT DID NOT REACT TO THE ASYMMETRICAL THRUST BY RETARDING THE THROTTLES SO CONSEQUENTLY THE AIRPLANE SWERVED TO THE L INTO THE GRAVEL OFF THE RWY. A CORRECTIVE ACTION COULD HAVE BEEN FOR MYSELF TO EITHER RETARD THE R MIXTURE (IN ADDITION TO THE L) OR TO OVERRIDE THE STUDENT'S ACTION (OR INACTION) BY RETARDING BOTH THROTTLES MYSELF. AS THE EXAMINER, I DID NOT WANT TO CORRECT THE PROB IMMEDIATELY SO AS NOT TO BE ABLE TO EVALUATE THE STUDENT'S CORRECTIVE PROCS, RESPONSE AND JUDGEMENT. HOWEVER, IN THIS CASE I WAITED TOO LONG TO TAKE CTL OF THE AIRPLANE.
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.