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| Date: | Thursday 27 October 2016 |
| Time: | 09:51 |
| Type: |  Aerospool WT-9 Dynamic |
| Owner/operator: | Aerospool |
| Registration: | OM-DYF |
| MSN: | DY-507/2014LSA |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | 2NM south from LZPE -
 Slovakia
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Test |
| Departure airport: | Prievidza Airport (LZPE) |
| Prievidza Airport (LZPE) | |
| Investigating agency: | LNVU |
| Confidence Rating: |  Accident investigation report completed and information captured |
On 27 October 2016 during a test flight of intentional tail spins for the purpose of verifying the fulfilment of the CS - LSA certification specification, a pilot with a WT9 Dynamic LSA / Club type airplane, registration number OM-DYF (hereinafter referred to as WT9), after a standard tail spin after one turn and the performance of a standard negotiation, continued in the tail spin. The airplane did not even react to the pilot's next attempt to perform a standard way of negotiation. During the airplane take-off, he probably went into a flat tail spin and even the subsequent pilot's interventions, including the use of a spin-recovery parachute which did not open, were not successful and the rotation was not stopped. The pilot left the airplane by jumping with a back-type rescue parachute and he landed uninjured. The airplane hit a field in the cadastral area of the village of Koš-Laskár. The airplane fall did not cause anyone any injuries. The airplane was destroyed during this air event.
Cause of the aviation accident
- the WT9 airplane, in the FG912T configuration type, did not have a tendency to negotiate left tail spins.
- the definite cause of the ineffectiveness of the standard way of left tail spin negotiation after 1 turn could not be detected;
- the combination of several impacts on the characteristics of left tail spin negotiation at the maximum weight and a rear center of gravity was the probable cause;
- the deflection of the directional rudder did not induce a sufficient moment to stop the rotation probably due to the lesser efficiency induced by the airplane position in the tail spin which corresponded to the flat tail spin;
- the original unadjusted altitude rudders were used.
Accident investigation:
 |
|
Sources:
https://myhornanitra.sme.sk/c/20369217/pri-kosi-spadlo-male-sportove-lietadlo.html
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2016 18:00 | guiness | Added |
| 28-Oct-2016 18:08 | Anon. | Updated [Aircraft type, Operator, Total fatalities, Total occupants, Source, Narrative, ] |
| 30-Oct-2016 11:41 | Anon. | Updated [Cn, ] |
| 30-Aug-2018 19:41 | harro | Updated [Other fatalities, Narrative, Accident report, ] |
| 17-Nov-2022 19:45 | harro | Updated [Departure airport, Destination airport, Narrative, Category, ] |
Corrections or additions? ... Edit this accident description
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