ASN Wikibase Occurrence # 166677
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| Date: | Sunday 1 June 2014 |
| Time: | 12:22 |
| Type: |  Yakovlev Yak-55M |
| Owner/operator: | Private |
| Registration: | N176FD |
| MSN: | 930810 |
| Year of manufacture: | 1993 |
| Total airframe hrs: | 214 hours |
| Engine model: | Vedeneyev M14P |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Stevens Point Municipal Airport (KSTE), WI -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Demo/Airshow/Display |
| Departure airport: | Stevens Point, WI (STE) |
| Stevens Point, WI (STE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was performing an aerobatic flight at an airshow event when the accident occurred. The flight team manager witnessed the accident and reported that the airplane entered an intentional inverted flat spin at the apex of an inside loop maneuver. The airplane completed more than 3 rotations in the inverted flat spin before recovering into a dive. The team manager then saw the airplane pitch up and enter an "aggressive" left turn. A review of ground-based video footage confirmed the sequence of events reported by the team manager and showed that, after the pitch up and left roll, the airplane entered a nose-low, descending left spiral that continued to ground impact. The observed flight path was consistent with an accelerated aerodynamic stall after the pilot had recovered from the inverted spin at a low altitude. The airplane cockpit was equipped with an aft-facing video camera that captured the pilot and his flight control movements. A review of the available cockpit footage confirmed that the pilot remained conscious throughout the accident flight and that the ailerons, elevator, and engine had responded to his control inputs. Although the rudder was obstructed from view in the video by the pilot's helmeted head, his observed leg movements were consistent with expected rudder inputs throughout the flight. Further, a postaccident examination of the airplane did not reveal any mechanical anomalies that would have precluded normal operation.
Probable Cause: The pilot's failure to maintain airplane control during the aerobatic flight, which resulted in the airplane exceeding its critical angle of attack and entering an accelerated stall at a low altitude.
Accident investigation:
 |
|
Sources:
NTSB
Location
Media:
WAOW - Newsline 9, Wausau News, Weather, Sports
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Jun-2014 18:52 | harro | Added |
| 01-Jun-2014 22:26 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Departure airport, Destination airport, Source] |
| 02-Jun-2014 06:49 | Anon. | Updated [Time, Aircraft type, Registration, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Departure airport, Destination airport] |
| 02-Jun-2014 13:22 | Hans Gruber | Updated [Embed code, Damage] |
| 03-Jun-2014 08:19 | TB | Updated [Aircraft type, Operator, Location, Destination airport, Narrative] |
| 12-Jun-2014 05:07 | Geno | Updated [Time, Source] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 19-Aug-2017 14:55 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Embed code, Narrative] |
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