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Pilot of an enstrom F28A lost control of the yaw control during hovering practice resulting in an uncontrolled landing causing damage to the carriage strut, tail rotor guard and blades and plastic windows.
| Attributes | |
| ACN | 439073 |
| Time | |
| Date | 199905 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jax.airport |
| State Reference | FL |
| Altitude | agl single value : 3 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : jax.tower tracon : okc.tracon |
| Operator | general aviation : personal |
| Make Model Name | F-28 Enstrom Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : holding ground : holding |
| Route In Use | approach : visual |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : multi engine pilot : private |
| Experience | flight time last 90 days : 150 flight time total : 6000 flight time type : 40 |
| ASRS Report | 439073 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : ground |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : yaw control other flight crewa |
| Resolutory Action | flight crew : landed in emergency condition |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
I was in a hover approximately 3 ft above ground. I ws turning helicopter to right using right anti-torque pedal, when suddenly helicopter started to spin. I tried to stop rotation using left peddle -- unsuccessful. I tried chopping power and do hovering automatic -- unsuccessful. I then slammed to ground. Upon impact, I disengaged main rotor blades clutch and started shutdown procedures. The front right strut gave way, causing the helicopter to wobble severely, and then the right rear strut gave way, causing the main rotor blades to contact asphalt surface. After about 20 seconds, all came to a halt. Damages: main rotor blades, all plastic windows, tail rotor guard and blades. After close examination of helicopter, I found the left anti-torque pedal broken due to rust. I am uncertain if the pedal broke while I was in the hover or after I made ground contact. All I do know, I was in a very gentle turn to the right and as I proceeded to apply left pedal, the ship continued its turning until I sat it on the ground. I do know that low RPM with the F28A will send you spinning the same way. Of course, enstrom has an upgrade system for their screwed up tail rotor system on the 'a' model for $5000+.
Original NASA ASRS Text
Title: PLT OF AN ENSTROM F28A LOST CTL OF THE YAW CTL DURING HOVERING PRACTICE RESULTING IN AN UNCTLED LNDG CAUSING DAMAGE TO THE CARRIAGE STRUT, TAIL ROTOR GUARD AND BLADES AND PLASTIC WINDOWS.
Narrative: I WAS IN A HOVER APPROX 3 FT ABOVE GND. I WS TURNING HELI TO R USING R ANTI-TORQUE PEDAL, WHEN SUDDENLY HELI STARTED TO SPIN. I TRIED TO STOP ROTATION USING L PEDDLE -- UNSUCCESSFUL. I TRIED CHOPPING PWR AND DO HOVERING AUTO -- UNSUCCESSFUL. I THEN SLAMMED TO GND. UPON IMPACT, I DISENGAGED MAIN ROTOR BLADES CLUTCH AND STARTED SHUTDOWN PROCS. THE FRONT R STRUT GAVE WAY, CAUSING THE HELI TO WOBBLE SEVERELY, AND THEN THE R REAR STRUT GAVE WAY, CAUSING THE MAIN ROTOR BLADES TO CONTACT ASPHALT SURFACE. AFTER ABOUT 20 SECONDS, ALL CAME TO A HALT. DAMAGES: MAIN ROTOR BLADES, ALL PLASTIC WINDOWS, TAIL ROTOR GUARD AND BLADES. AFTER CLOSE EXAM OF HELI, I FOUND THE L ANTI-TORQUE PEDAL BROKEN DUE TO RUST. I AM UNCERTAIN IF THE PEDAL BROKE WHILE I WAS IN THE HOVER OR AFTER I MADE GND CONTACT. ALL I DO KNOW, I WAS IN A VERY GENTLE TURN TO THE R AND AS I PROCEEDED TO APPLY L PEDAL, THE SHIP CONTINUED ITS TURNING UNTIL I SAT IT ON THE GND. I DO KNOW THAT LOW RPM WITH THE F28A WILL SEND YOU SPINNING THE SAME WAY. OF COURSE, ENSTROM HAS AN UPGRADE SYS FOR THEIR SCREWED UP TAIL ROTOR SYS ON THE 'A' MODEL FOR $5000+.
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.