ASN Wikibase Occurrence # 195689
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| Date: | Friday 26 May 2017 |
| Time: | 12:30 |
| Type: |  Aerotek Pitts S-2A |
| Owner/operator: | Private |
| Registration: | N67PN |
| MSN: | 2219 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 2258 hours |
| Engine model: | Lycoming AEIO-360-A1E |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sheboygan County, Sheboygan Falls, WI -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Sheboygan, WI (SBM) |
| Sheboygan, WI (SBM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot and a private pilot-rated passenger departed in an aerobatic airplane to perform a fly-by over a local raceway. About 10 minutes after the fly-by, one witness saw the airplane flying level when its engine stopped producing sound. The airplane continued level flight for several seconds before it suddenly entered a nose-down, descending spiral and impacted the ground. However, two other witnesses saw the airplane conduct a vertical climb before entering what they described as a "corkscrew" and a "fast spin." Both of these witnesses described engine sound anomalies and that they thought the pilot was trying to restart the engine.
The airplane came to rest inverted on plowed terrain. Signatures on the propeller were consistent with the engine not producing significant power at the time of impact; however, examination of the wreckage did not reveal any preimpact anomalies that would have precluded operation of the airplane and engine.
Weight and balance calculations were produced using occupant weights at various fuel loads. Even at minimum fuel, the airplane was operating above its maximum gross weight of 1,500 lbs for approved flight in the acrobatic category at the time of the accident. Additionally, the airplane's calculated center of gravity was outside the envelope for the acrobatic category. It is likely the airplane's gross weight exceedance and operation outside the weight and balance envelope for aerobatic flight contributed to the pilot's difficulty in adequately controlling the airplane.
The investigation could not determine which occupant was manipulating the controls at the time of the accident. Regardless, the pilot was responsible for maintaining flight control.
Probable Cause: The pilot's failure to maintain airplane control following a partial loss of engine power during a low-level aerobatic maneuver; the reason for the loss of engine power could not be determined during postaccident examination of the engine. Contributing to the accident was the pilot's exceedance of the airplane's published maximum gross weight and center of gravity limits for the acrobatic category.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=67PN
Location
Images:
Photo: NTSB
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-May-2017 21:31 | Geno | Added |
| 27-May-2017 06:25 | Iceman 29 | Updated [Time, Source, Embed code] |
| 27-May-2017 08:26 | gerard57 | Updated [Total fatalities, Total occupants, Source, Narrative] |
| 27-May-2017 12:01 | Anon. | Updated [Damage] |
| 22-Mar-2019 19:09 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ] |
| 24-Mar-2019 08:52 | harro | Updated [Source, Narrative, Photo] |
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