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Helicopter flight instructor and pilot experience dynamic rollover during hover autorotation practice during a training flight.
| Attributes | |
| ACN | 767042 |
| Time | |
| Date | 200712 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 3 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : instructional |
| Make Model Name | Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | other |
| Function | instruction : instructor |
| Qualification | pilot : multi engine pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 1600 flight time type : 50 |
| ASRS Report | 767042 |
| Person 2 | |
| Affiliation | other |
| Function | instruction : trainee |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
I was giving flight instruction to a student seeking a private pilot helicopter add-on. We were approximately 1 hour into the lesson when we experienced dynamic rollover. The sky was clear; visibility was unlimited; and the winds were light -- less than 5 KTS. We were practicing hovering automatic-rotations. The previous 4 hovering autos were normal for a student with less than 20 hours in helicopter. The student initiated the 5TH hovering automatic-rotation and everything appeared to be normal. He was doing everything by the book. When the helicopter started to descend; the student initiated the collective pitch pull. When the left skid came in contact with the ground; the student took out the right cyclic input and added a slight left cyclic input. At this point I added full right cyclic; full down collective; and left pedal to try to stop the rolling motion. The helicopter continued to roll to the left where it came to rest on the left side. I was on the controls with the student throughout the maneuver as I was taught when I was obtaining my CFI helicopter rating. Both the student and myself walked away from the aircraft unharmed and unassisted.
Original NASA ASRS Text
Title: HELI FLT INSTRUCTOR AND PLT EXPERIENCE DYNAMIC ROLLOVER DURING HOVER AUTOROTATION PRACTICE DURING A TRAINING FLT.
Narrative: I WAS GIVING FLT INSTRUCTION TO A STUDENT SEEKING A PVT PLT HELI ADD-ON. WE WERE APPROX 1 HR INTO THE LESSON WHEN WE EXPERIENCED DYNAMIC ROLLOVER. THE SKY WAS CLR; VISIBILITY WAS UNLIMITED; AND THE WINDS WERE LIGHT -- LESS THAN 5 KTS. WE WERE PRACTICING HOVERING AUTO-ROTATIONS. THE PREVIOUS 4 HOVERING AUTOS WERE NORMAL FOR A STUDENT WITH LESS THAN 20 HRS IN HELI. THE STUDENT INITIATED THE 5TH HOVERING AUTO-ROTATION AND EVERYTHING APPEARED TO BE NORMAL. HE WAS DOING EVERYTHING BY THE BOOK. WHEN THE HELI STARTED TO DSND; THE STUDENT INITIATED THE COLLECTIVE PITCH PULL. WHEN THE L SKID CAME IN CONTACT WITH THE GND; THE STUDENT TOOK OUT THE R CYCLIC INPUT AND ADDED A SLIGHT L CYCLIC INPUT. AT THIS POINT I ADDED FULL R CYCLIC; FULL DOWN COLLECTIVE; AND L PEDAL TO TRY TO STOP THE ROLLING MOTION. THE HELI CONTINUED TO ROLL TO THE L WHERE IT CAME TO REST ON THE L SIDE. I WAS ON THE CTLS WITH THE STUDENT THROUGHOUT THE MANEUVER AS I WAS TAUGHT WHEN I WAS OBTAINING MY CFI HELI RATING. BOTH THE STUDENT AND MYSELF WALKED AWAY FROM THE ACFT UNHARMED AND UNASSISTED.
Data retrieved from NASA's ASRS site as of January 2009 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.